What prop should I get? Lucas oil [Archive]

fox88gt

08-24-2015, 02:48 PM

I have a x645 do you think that would be too much pitch? I guess I can try it it wouldn't hurt.

I have tried an x645 on my stock Lucas Oil (well, stock electronics, blueprinted bottom and rounded rudder bottom) and it was fast, but watch the run times and temperature. The motor got quite warm - 45 mm diameter is a lot of blade to swing. But it went like a banshee!

For a better balance of speed, run time, and heat, the x642 is a great propeller.

paulfromtulsa

08-24-2015, 05:55 PM

I have tried an x645 on my stock Lucas Oil (well, stock electronics, blueprinted bottom and rounded rudder bottom) and it was fast, but watch the run times and temperature. The motor got quite warm - 45 mm diameter is a lot of blade to swing. But it went like a banshee!

For a better balance of speed, run time, and heat, the x642 is a great propeller.

what do you think is faster a 642 or a 445?

fox88gt

08-25-2015, 11:52 AM

what do you think is faster a 642 or a 445?

I can't give an honest answer because I haven't tried an m445. I'd like to try one though, because it seems like a good prop for these boats; a lot of people run them. I can say to not try a Grimracer 42x66 lifter prop on the Lucas/MC - it would barely get on plane! That prop worked well on my Revolt however.

Brushless55

10-06-2015, 11:23 AM

I can't give an honest answer because I haven't tried an m445. I'd like to try one though, because it seems like a good prop for these boats; a lot of people run them. I can say to not try a Grimracer 42x66 lifter prop on the Lucas/MC - it would barely get on plane! That prop worked well on my Revolt however.

That's a prop I need to try next on mine..
with a X645 is was a beast !

SD Eracer

10-16-2015, 02:13 PM

My favorite for that boat is the Octura X642 and then the Grimracer 42x55. I have an M445, but never tried it on the Lucas Oil.

My boat with a 2030kv UL-1 motor, will do 53mph tops on the X642, and about 50 mph with the 42x55. The X642 is a great prop for that boat.

I don't see any cooling differences, the boat comes out with 115F on the motor and 110 on the ESC with stock cooling.

fox88gt

10-16-2015, 02:24 PM

SD Eracer

10-16-2015, 03:06 PM

Those are impressive numbers. I will have to try one of those 2030kv motors one of these days.

The UL-1 2030kv and X642 prop is a great setup for the Lucas Oil, guaranteed 50+ mph boat.

There are a few warnings however with this setup....

- The hull isn't designed for a hard flip at that speed. Make sure to adjust your strut down to help prevent blowovers, move your batteries further forward as well.

- Solder 5.5mm connectors to the motor and ESC wires. The 2030kv motor runs hotter on the wires than the 1800kv motor does, it will melt your 4mm solder off easily.

- Don't get lazy with taping up of the hatch. Make sure you tape up well, at higher speeds you risk your hatch flying off in a flip.

- I am already assuming you are using a Kintec or OSE flexshaft, the factory one barely could handle stock motor and plastic prop.

- Your run times will be reduced from about 4 minutes to 3.5 minutes with the higher kv motor.

Brushless55

10-20-2015, 10:25 PM

Those are impressive numbers. I will have to try one of those 2030kv motors one of these days.

Even with a X440/3 on the 2030 motor mine does very well in Offshore class :biggrin:

pistol18

11-01-2015, 09:06 AM

I have both the MC and LO, as others above mentioned the GR 42x55 is a great all around prop. I also have the m445 and have changed each boat to it, picking up a 1mph to 3mph. I havent tried the x642 yet but still have the 1800kv stock motor in both hulls.

With this setup, these boats are my fun, "never a problem", run 4 minutes each batt set and my kids drive them too.

On a side note, I accidentally picked up 2 revolts(bought one here on OSE, won another on ebay :laugh:) and those boats are a blast too!

MIDWESTOUTLAW

11-05-2015, 01:59 PM

I raced my lucas oil in P-limited offshore this weekend and compleated 13 3/4 laps in 4 minutes using a M445.

jfrancisco892

11-05-2015, 02:05 PM

M445 is starting to push it for offshore with that boat. IME I have had good luck in sprint racing with a M545 and a thinned x440/3 for offshore. 1800kv in both(Won our club class in sprint, only ran in offshore a couple times but that prop definitely didn't lack speed against the other boats). Whoever mentioned 2030kv and x440/3 for offshore I would say you can easily cook a motor with that setup if it is warm outside.

Brushless55

11-06-2015, 10:53 PM

Even with a X440/3 on the 2030 motor mine does very well in Offshore class :biggrin:

M445 is starting to push it for offshore with that boat. IME I have had good luck in sprint racing with a M545 and a thinned x440/3 for offshore. 1800kv in both(Won our club class in sprint, only ran in offshore a couple times but that prop definitely didn't lack speed against the other boats). Whoever mentioned 2030kv and x440/3 for offshore I would say you can easily cook a motor with that setup if it is warm outside.

not even close bro :wink:
that motor ran very nice
temps were 115-120* after 4min

paulfromtulsa

11-07-2015, 10:32 AM

Out of all my props the Prather 225 got then most speed without over heating. I got 45mph

vincea

07-22-2016, 05:59 PM

Best heat racer prop??

Sent from my SM-G920V using Tapatalk

JJ1TRXSAton

02-07-2017, 02:31 AM

Just started with RC boats 3 months ago... Trying to setup my MC with a good prop. Tried using the x442, x642, & m440/3... just wondering if the previous posters were running on 4S or 5S? Thanks...

SD Eracer

02-07-2017, 02:35 AM

JJ1TRXSAton

02-07-2017, 02:40 AM

Brushless55

02-08-2017, 03:11 PM

Just started with RC boats 3 months ago... Trying to setup my MC with a good prop. Tried using the x442, x642, & m440/3... just wondering if the previous posters were running on 4S or 5S? Thanks...

on 4s a M445 works great
I've also used a X645 and held on!

JJ1TRXSAton

02-08-2017, 03:24 PM

on 4s a M445 works great
I've also used a X645 and held on!

Hahaha. awesome. Thanks for the info and prop sizes. :Peace_Sign:

MADRCER

06-02-2017, 02:17 PM

Stock 1800kv motor?

The Aquacraft 42x55 or the Octura X642 has been my favorite on 4S with that hull. About 48 mph with the X642.

Get the 2030kv Aquacraft motor with the X642 and you are at 54 mph on 4S.

I would try to stay at that speed or below with a stock hull, a hard flip will crack the seams on that boat.

I have tried 3 props x642 profesionally s&b 38.5mph, x442 s&b 38.2mph, 42x55 not sharpen just for the hell of it and ran 35mph. All on zippy 5000 mah 4s. Strut set at 1/8 up from sponsons batteries all the way back,middle, center every which way imaginable and not getting close to the 45-50 mph speeds you all are getting? What am I missing? I have the strut set level, should I put negative or positive angle at the end of the strut. I watched a video of Mike Z himself and he demoed the boat and said it was capable of running near and up to 40mph?? Not sure how you all are reaching nearly 50 on 4s. Any help would be appreciated. All my test have been on near perfect water. Here is a link to Mike's video.

https://m.youtube.com/watch?v=-upT7Elc-8I

Thanks.

Prodrvr

06-02-2017, 02:26 PM

If these guys are getting 50 on 4s, I'll definitely hit 70 with my 6s setup.

MADRCER

06-02-2017, 06:49 PM

Do any of you add any positive to your strut after it is set or do you just adjust the height level or just below the sponsons and roll with that?

SD Eracer

06-02-2017, 08:00 PM

I have tried 3 props x642 profesionally s&b 38.5mph, x442 s&b 38.2mph, 42x55 not sharpen just for the hell of it and ran 35mph. All on zippy 5000 mah 4s. Strut set at 1/8 up from sponsons batteries all the way back,middle, center every which way imaginable and not getting close to the 45-50 mph speeds you all are getting? What am I missing? I have the strut set level, should I put negative or positive angle at the end of the strut. I watched a video of Mike Z himself and he demoed the boat and said it was capable of running near and up to 40mph?? Not sure how you all are reaching nearly 50 on 4s. Any help would be appreciated. All my test have been on near perfect water. Here is a link to Mike's video.

https://m.youtube.com/watch?v=-upT7Elc-8I

Thanks.

Out of the box with a stock plastic prop, you are looking at 38-40 mph or so. Get the 42x55 or 642, your speeds should go to 45 mph or so, with some tuning, 47-48 mph is about the limit with the stock 1800kv on 4S. You go with a 2030kv from the UL-1, you should hit 54-55 mph. We have stock 2030kv motors on 5S with Seaking 120/180 ESCs doing 60+ mph.

These speeds are pretty normal from what I've seen. I don't know why are you getting 38 mph with a x642 on 4S, you should be in the 45-47 mph zone. My strut angle is a bit more negative than neutral and the batteries as far forward as possible to keep the nose down, otherwise it blows over really easy.

My only though is your motor has a problem, or your throttle isn't calibrated properly. However, is you are using the stock Aquacraft ESC, it forces you to do a throttle calibration everytime you arm it, so it can't be that.

Maybe take a video and post it for us?

MADRCER

06-02-2017, 08:57 PM

Here is a video of the first run box stock on 4s. (33.9mph). The Geico was running 42 mph I have a video I will upload tonight of the 38 mph run with x642.

https://youtu.be/pleTfo56sxk

SD Eracer

06-02-2017, 09:06 PM

MADRCER

06-02-2017, 11:24 PM

It does look a bit slow. I'm using the same GPS by the way.

I'm assuming you are running the stock flexshaft?

If so, is the brass bushing in the strut free floating, or is it jammed in there? How much friction is there with the flexshaft in the strut?

Sometimes the tolerances on the stub shaft and the brass bushing are off and cause too much friction.

Also, how much gap are you leaving between the drive dog and the end of the strut, you want about 3-4 mm at least. Sometimes under hard acceleration, the flexshaft will compress enough to bind the drive dog to the end of the strut.

OSE flex shaft installed now, but in that video I had the OEM flex in it with the plastic prop.
4-5mm gap is the setting I use for flexshaft.

Bushing doesn't free float. I sanded it and got it to come in and out of the stuffing tube pretty good, now when push it all the way in it goes inside the strut holder and I leave the 5mm gap then when I give the boat throttle the bushing sucks back out onto the OSE flex right against the drive dog. Is this normal? The bushing seems to stay out of the holder about 5mm because I have than much gap and it is getting pulled out by the flex when the motor spins. Do you have a picture if your strut setting that I can compare to mine? People are saying 1/8 inch BELOW the sponson's and I also read 1/8 inch above the sponson's. Which is correct to be in the ballpark with x642? Thanks for your help!

Here is another running video (38mph) with x642 that you might be able to tell more about it.

https://www.youtube.com/watch?v=GL-I9oA7eiQ

SD Eracer

06-03-2017, 12:02 PM

Yes, that's perfectly normal for the bushing to move around inside and a little outside during operation, that's what you want to see with that setup.

Attached is my photos of my strut settings, it's what I've been using since I switched to the 2030kv and X642, otherwise the boat will flip over due to the speeds it's getting now.

I would say the bottom of the strut is about 1/8" below the sponson, but also in negative direction. Please note that 3rd photo makes it look like the strut is level, it is not, it's about 1/8th down below sponson, I just wanted you to get a closer look at the negative angle of the strut.

I don't think this will fix your problem, my settings are because of the speeds the boat is getting, your lack of speed seems to be from your lack of power. Maybe borrow a 1800kv motor and see if there is any difference? My UL-1 had a motor issue that caused speed problems, Aquacraft sent me a replacement and fixed the problem.

151850
151851
151849

TheShaughnessy

06-03-2017, 12:58 PM

an m445 or an x 642 are pulling upwards of 80 amps, which an AQ motor can handle in 5 second burst. Not really sure how you guys are running 4 + min with an m445, I pull over 2500 mah after a 2 min race, 2 more min and my batteries would be pissed and motor wires would start de soldering. Im in the 45-48 mph range. certainly not 54. I suppose it could be done but I put a lot of importance on actually finishing the race so maybe I'm not running as loose as some of you guys .

SD Eracer

06-03-2017, 01:08 PM

Our group doesn't do races, but we are pretty much on full throttle the whole 4-5 minutes. The 54 mph is with a 2030kv motor, we are hitting 47 mph with the 1800kv.

For must of us, the X642 has been our "go to prop" either on 4S or 6S applications, we haven't seen any issues with it. I've noticed very little performance differences between the X642, M445 or Grimracers 42x55 in terms of speed and consumption.

MADRCER

06-03-2017, 05:58 PM

Ran it again with the strut bushing freed up and lost a mph only got 37 with x642. I guess it is a bad/weak motor..

SD Eracer

06-04-2017, 05:30 AM

That's the only thing I can think of, we did a shake down run of a new Motley Crew with a rather dull barely balanced Grimracer 42x55 prop and it did 45 mph with some old Turnigy 5000mah batteries.

This was out of the box, other than putting on an OSE flexshaft and brass prop, it was completely stock.

If your boat is still under warranty, I would give Aquacraft a call, they are pretty good about making sure the boat is right.

MADRCER

06-04-2017, 02:06 PM

Thanks for your help! I will contact them it is only 2 weeks old and been ran/tested only 4 times. The motor in mine when I spin it by hand it seems to have double the resistance from the magnets than my Pro Boat 2000kv motors that I have on my Geico and zelos twin. Does this seem normal for AQ motors?

SD Eracer

06-04-2017, 02:15 PM

It is a 6-pole motor, it should have more resistance when turning than your typical 4-pole motors.

Just to confirm, after you arm the boat (which requires a throttle calibration), do you touch the throttle trim on the radio by chance? The throttle trim on electrics should be set at around the 2 or 3 o'lock location, and will require a throttle re-calibration anytime they are adjusted.

MADRCER

06-04-2017, 02:24 PM

No, I never touched the throttle trim after the ESC has been armed. Only the steering trim.

SD Eracer

06-04-2017, 02:32 PM

Gotcha, then it's the motor or ESC.

Either the motor isn't giving out the power it should, or the ESC isn't allowing it to.

This is assuming your batteries are working fine.

MADRCER

06-10-2017, 04:37 PM

Ran the boat yesterday with a 2030kv in it while I am waiting on my replacement 1800kv and hit 45.1 mph with a x442 mild s&b. Am I in the ball park with this prop and set up? I didn't try to re adjust strut and try the x642 again during this outing but it still looked like it was flat and a little too wet. Probably could raise the strut a mm or so and pick up a little. What y'all think? If I am getting 45 with the ESC I assume it is ok?? What ya'll think? The strut is flat and touching the table when the rear sponsors are pushed down while touching the table. See video

https://www.youtube.com/watch?v=m96RSTEA1P0

SD Eracer

06-11-2017, 11:53 AM

That's about right with a 442, looking pretty good actually.

I would leave your hull settings the same, especially if you plan on using the X642 prop, the temps and consumption won't be that much higher.

But the danger with the X642 is that it will bump you up to 50-54 mph range immediately on the 2030kv motor. Which will increase that hull flipping over more easily, which could damage that stock hull at that speed.

To prevent that, running a little more wet and/or also moving your batteries farther forward is a good idea. A forward portion of my batteries are slightly past the motor mount on my boat. I also run the front air deflector to further risk the chance of blowover.

Unlike other hulls, these Aquacraft tubs are not as easy to reinforce. My stock hull cracked almost from tip to tail after a 54 mph flip. I fixed it from the outside and it seems to have withstood several more bad flips, but the Lucas oil hull doesn't seem to be as strong as the stock Motley Crew hulls, even though the designs are the same.

Just be careful going forwards, try to avoid the hard flip on a stock hull.

MADRCER

06-11-2017, 12:07 PM

Ok and thanks for your help! I'll post a video comparing the speeds with a x442, 42x55, and the x642 sometime in the near future. I got a Prather 220 coming and plan to try it as well. How do you think the 220 will perform against these props with this boat?

SD Eracer

06-11-2017, 12:58 PM

Absolutely, happy to help! I'm not familiar with Prathers, most of my experience has been with Octuras.

However, since it's hard to find certain brass prop sizes (45mm for example) in left and right turn for my HPR 115 and other dual drive cats, I may start looking at other brands. The CNC props sold in L&R configurations rarely survive a few packs through a big dual drive cat on speed runs.

MADRCER

06-16-2017, 08:04 PM

I ran the boat today with my replacement 1800kv Aquacraft sent me and hit 41.6 with the x442 strut was set the same exact way as the x442 45mph run. I ran in a different lake so the water conditions werent exactly the same as the previous run, but close to the same. I ran it early in the morning and I guess the Humidity in the air made my hatch seal tape come loose (never had this problem ever before) and the top blew off. However I was able to recover it but not what I was expecting to be doing at 6AM in the morning on my way to work. Lol. Anyone else have this problem with the tape not sticking early in the morning? Well it stuck good until the boat was in the water on the second pass it flew off. I even put it on while the boat was still in the seat of my truck before the boat ever was taken outside.

SD Eracer

06-16-2017, 08:15 PM

Excellent, that's about right with the 442 on a 1800kv, I can see 45-47 mph when you switch over to the 642. Temps and consumption will hardly be noticeable, but the speeds will be.

As for tape, I highly recommend you use Harbor Freight Black Electrical Tape, the one they sell at $5 for a package of 10.

They have just the right amount of adhesive for a good seal, but not enough to leave residue or damage your paint/decals. One of the few things Harbor Freight sells that I could actually recommend buying.

Also, since you get so much tape for so cheap, you should double up on how much you apply for better insurance. Make sure to always bring a dry microfiber towel to dry the canopy area before you apply the tape.

MADRCER

06-16-2017, 08:24 PM

Thanks! I will try the 10 Pack at HF. I normally use the Hockey tape from Kinetic and it sticks real good but not this morning. I got another x642 coming from Dasboata. My orginial from Rocket city decided it wanted a divorce from Miss Geico and left her for some other fish in the sea last run. Lol

SD Eracer

06-16-2017, 08:45 PM

I will try the 10 Pack at HF. I normally use the Hockey tape from Kinetic and it sticks real good but not this morning. I got another x642 coming from Dasboata. My orginial from Rocket city decided it wanted a divorce from Miss Geico and left her for some other fish in the sea last run. Lol

I love Hockey Tape, but I prefer to use it on my old beater HPR that already has a beat up finish. That boat of course uses lock screws, so the tape is only for water proofing, but at 80+ mph, you want hockey tape.

But just remember that hockey tape will eventually destroy your finish. Some people will apply a clear tape over the area that's semi-permanent. So when you apply and remove tape constantly, it's only hurting the tape and not the paint under it.

As for Dasboata, they are fantastic. I will mention though that Octura props are some of the easiest props to sharpen and balance. They have some rough flashing that's easy to remove, and they are pretty sharp to begin with. I can usually S&B a X642 in about 20 minutes.

MADRCER

06-21-2017, 10:05 PM

Done a few test with different props and the replacement 1800kv motor if anyone is curious on the speed differences between them on my set up. No strut adjustments were made only prop swaps and the test were all done on the same exact day and water conditions (average with some mild chop). The boat still has more in it but I wanted to find out which prop I liked best and be faster for me then I will fine tune the boat for maximum speed without blowing over.

Batteries 2x Zippy 2s 5000mah 45c
42x55 Grim 43.6mph (sharpened and balanced by me). This prop would probably get 44.5mph with the nano tech 6.6 batteries since they traditionally pull another mph than my others
Prather 220 s&b 39.3mph This run was on the packs that I had already ran 3 laps on with the 42x55 prop, so maybe add 2mph more if they were fresh charged batteries. This prop got out of the hole very well with very little cavitation if any at all.

Batteries 2x Turnigy nano-tech A-SPEC 6600mah 2S 65~130C (these batteries always log one mph more than any batteries I use in this boat)
x442 s&b 43.1 mph

still waiting on my x642 prop to test.

JJ1TRXSAton

06-21-2017, 10:19 PM

Very cool info MADRCER. What gps tracker did you use? My friends get different results using the dynamite speed tracker and the Garmin ones. MY MC likes running with the X642.

Just saw your vid and saw the Garmin gps unit. :thumbup1:

MADRCER

06-21-2017, 10:21 PM

Thanks! I used the Garmin Forerunner 101 on all these test. What speed are you getting out of the x642 and on what motor?

JJ1TRXSAton

06-21-2017, 10:26 PM

Hit 49 twice with the X642. Using the Giant Power 2S 6500mah 65 - 130C lipos. It does like to blow over sometimes. So far no hull damage.

MADRCER

06-21-2017, 10:40 PM

Nice! 1800kv or 2030kv?

JJ1TRXSAton

06-21-2017, 10:52 PM

The 1800kv. Going to swap in a different motor my friend has just to try it out.

MADRCER

07-07-2017, 10:22 PM

Finally had time to run the x642 prop so I wanted to update my previous post with the speeds, if anyone is still curious on the differences see below. I believe I could raise the strut just a tad and pick up another mph but I am happy with it the way it is for now. However, I may try a M445 soon to see how it stacks up with the others.

Done a few test with different props and the replacement 1800kv motor if anyone is curious on the speed differences between them on my set up. No strut adjustments were made only prop swaps and the test were all done on the same exact day (except for the x642 test) and water conditions (average with some mild chop). The boat still has more in it but I wanted to find out which prop I liked best and which one would be faster for me so I can fine tune the boat for maximum speed without blowing over.

Batteries 2x Zippy 2s 5000mah 45c
42x55 Grim 43.6mph (sharpened and balanced by me). This prop would probably get 44.5mph with the nano tech 6.6 batteries since they traditionally pull another mph than my others
Prather 220 s&b 39.3mph This run was on the packs that I had already ran 3 laps on with the 42x55 prop, so maybe add 2mph more if they were fresh charged batteries. This prop got out of the hole very well with very little cavitation if any at all.
x642 (DASBOATA) 44.3mph

Batteries 2x Turnigy nano-tech A-SPEC 6600mah 2S 65~130C (these batteries always log around one mph more than any batteries I use in this boat)
x442 s&b 43.1mph
x642 (DASBOATA) 45.4mph

SD Eracer

07-07-2017, 10:43 PM

Looks good, I think you have a few more mph in there with your strut settings and battery location.

Adjust one item at a time (strut positive or battery farther back) and check the speeds after each adjustment.

I figure 47 - 48 mph with the 1800kv and X642 should be consistent once you get the settings dialed in.

I would avoid going over 50mph with that hull, it's easy to break a seam over that speed with a hard flip.

A couple of years ago my Genesis cat was doing about 70mph before I lost connection and it hit the embankment and flipped head over tail several times on the ground before knocking a guy off his lawn chair and finally settling on the grass. I had zero structural damage, just a broken rudder break bolt. This was because I reinforced the hull with a couple of layers of fiberglass cloth. Unfortunately, its impossible to reinforce the Lucas Oil hull without cutting it open. I know people who drilled holes and filled it with expanding foam from the outside, but it ended up messing up the balance of the boat.

Just keep it the fun sporting boat you have now.

MADRCER

07-07-2017, 10:56 PM

Damn must of been a hell of a flip lol... I'm not going to try to cut the tub and reinforce it unless it breaks. I was mostly interested in the prop swaps to see which one could pull the most mph on the same set up.

SD Eracer

07-08-2017, 03:37 AM

Yup, it sure was :smile:

It was loud, everyone that heard it knew it didn't sound well, kinda like a bad belly flop.

I think you will find the X642 the best all-around prop for that boat, even my Pursuit mono seems to like it better than the M445. What's interesting is the temps and lipo pull isn't noticeable more than the mild Grimracer or 445 props.

I forgot to mention that living in San Diego, we pretty much run in salt water, which does allow our boats to go slightly faster than compared to fresh water. So the times I mentioned, you may want to knock a mph or so off for fresh water.

MADRCER

07-08-2017, 01:55 PM

Good info on the saltwater. I would have never thought that it would be faster than running in freshwater.

SD Eracer

07-08-2017, 02:04 PM

Yup, the salinity increases buoyancy or something like that. It's not a huge difference.

Good info on the saltwater. I would have never thought that it would be faster than running in freshwater.

martin

07-08-2017, 02:30 PM

Salt water is denser than fresh, you get more buoyancy & the prop slips less. I run on salt water most of the time & if I run my boat on fresh water with the same set up the boat looks slower but also sounds like its revving higher due to more prop slip.

CraigP

07-08-2017, 03:08 PM

The hydro hull skips better on salt, spends more time in the air. We used different props between fresh and salt in GP and Unlimited. We took rake out of the prop on salt to diminish additional prop walk. Also, salt water cools much better! Had to make timing/fuel adjustments. Warmer fresh water is a concern for water cooled FE's...

Prodrvr

07-08-2017, 04:04 PM

we pretty much run in salt water, which does allow our boats to go slightly faster than compared to fresh water. So the times I mentioned, you may want to knock a mph or so off for fresh water.

Whaaaaat?? That's a first I've ever heard of that.

CraigP

07-08-2017, 07:09 PM

Yeah, it's true... But running your boat in salt water sucks! It's just hard on your running gear

MADRCER

08-07-2017, 10:43 PM

I had to give the Motley Crew a little love today...I ran 47.5mph today with the 1800kv stock motor and x642 prop so I wanted to update my post from a few weeks ago that had prop speeds for anyone who cares...lol

Done a few test with different props and the replacement 1800kv motor if anyone is curious on the speed differences between them on my set up. No strut adjustments were made only prop swaps and the test were all done on the same exact day and water conditions (average with some mild chop). The boat still has more in it but I wanted to find out which prop I liked best and be faster for me then I will fine tune the boat for maximum speed without blowing over.

Batteries 2x Zippy 2s 5000mah 45c
42x55 Grim 43.6mph (sharpened and balanced by me). This prop would probably get 44.5mph with the nano tech 6.6 batteries since they traditionally pull another mph than my others
Prather 220 s&b 39.3mph This run was on the packs that I had already ran 3 laps on with the 42x55 prop, so maybe add 2mph more if they were fresh charged batteries. This prop got out of the hole very well with very little cavitation if any at all.
x642 s&b (Dasboata) 45.2mph

Batteries 2x Turnigy nano-tech A-SPEC 6600mah 2S 65~130C (these batteries always log one mph more than any batteries I use in this boat)
x442 s&b 43.1 mph
x642 s&b (Dasboata) 46.1mph

Battery 1-4s Revo 435 blend 5800mah
x642 s&b (Dasboata) 47.5mph

153149

https://www.youtube.com/watch?v=Dusz7leDxAI&t=157s

Prodrvr

08-08-2017, 06:17 AM

You should use the same batteries for each prop test. You'll have more accurate results that way.

MADRCER

08-08-2017, 10:39 AM

Thanks Johnny. I knew I forgot something. see the above post. I updated the other speeds on the x642 s&b

Prodrvr

08-08-2017, 12:46 PM

Good to see the winner is a Dasboata prop and Revo lipo's.

Brushless55

08-08-2017, 01:00 PM

Out of that group, the 642 will have the best top speed
Good amount of pitch

When I ran a X645 it was awesome! LOL

MADRCER

08-08-2017, 11:21 PM

Did the x645 have more top speed of any you used? Any cons of using the x645?

Brushless55

08-09-2017, 02:04 AM

Did the x645 have more top speed of any you used? Any cons of using the x645?

much more speed..
massive holeshot!
I went with bigger cooling lines and the temps stayed very good at under 110* all out for a couple minutes.
have to set the strut just right or it will want to blow over.. I was in the mid 50's with it.. stock motor and esc..

Fluid

08-18-2017, 11:00 AM

Another data point: my own MC uses the AQ1800 motor and a 4S1P5000 pack. With the m445 it hits 47 mph and can complete a 6-lap NAMBA heat without excessive heat on a 95* day - and win. The m545 only added one mph. Switching out to an m645 it tops out at 53 mph but after three laps it has reached the same temps as the m445 did after 6 laps. Not a prop for Texas summer racing, but in winter it performs awesome on the race course.

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