Testing Pursuit with a 4074 1800kv 180a ecs and turtle modded x447/3 on 6s1p 55.8 mph

[lenny]

Update on the Pursuit and the turtle that modded my x447/3 prop,
Did some testing today on 4s1p and 6s1p with the modded T x447/3 prop.
All temps are under 120f after the short runs.
Also I think this is the turtle that did the work on my prop,
It's shell in the back left side is nice a buffed and dark now where the boat mounted it.

TURTLE 013.jpgTURTLE 007.jpgTURTLE 008.jpg Pursuit 074.jpg

Now modded T x447/3 Pursuit 083.jpg


Sorry,
Video's next page down.

[lenny]

Hear we go.

4s1p 40c 4000mah and just testing the prop since the T mod to it.



6s1p 40c 5000mah take one.



6s1p 40c 5000mah take two same pack.



Also the 6s pack is a little off on one of the cells by about .8 when fully charged,
But that is how I bought the pack used for $20.00 on hear.
Reading after the runs are 3.81 3.86 3.86 3.85 3.86 3.87.
The temps on the 6s short runs so far are below 120f on everything,
And that is adding 10 degrees to the 120f. From stopped time to hatch off.
I guess the higher volts and less amps are more efficient and showing lower temps for the setup.

[Heaving Earth]

Fast boat there

[kevinpratt823]

She's moving alright. That thing's gotta be working pretty hard to spin that much prop at those rpm's, did you get any temp readings after multiple passes yet?
BTW, your paint job scheme is pretty sweet!

[lenny]

Thanks,
But it may be running a little wet if I could see it better.

And yes,
Added temp info above for the for the first and second runs.
This is only the third time out testing this setup on 6s for me,
But I think the motor may have had 6s or more through it before.
Because I bought it used on hear and it had a weird smell to it,
And the guy had no clue what he was doing as for FE setups.

The paint is all kintec racing's doing.
DSCN2946.JPGDSCN2948.JPGPursuitOnWater_zps849611f4.jpg
And it is missing the original hatch, It was lost some where in Alaska.

[kevinpratt823]

Higher volts/less amps really only applies when you reduce the kv of the motor to match the same rpm's. Higher volts/same kv means higher rpm's, increased load, higher amps, higher temps..........
Be very cautious if you want to run this setup, IMO anything more than a few wide open passes and something may let go.......
But you're the one running it, so it's your experience that counts most, and so far it certainly appears to run well.

[lenny]

I also still have the internal BEC hooked up,
And timing is set at 15.00 degrees.
I do not know what's up with this setup,
But the higher volts I go the lower my temps go on the setup and the connectors to.

[Heaving Earth]

I have the same problem with my mm. It runs cooler on 5s than 4. Not that's it's a problem lol

[srislash]

Looks good Lenny. Your making me want to build mine there. BTW I had the same temp issue when I went to 5s on my 1515 powered Geico. Come to think of it,I think the Shocker(1800kv) was much happier with the volts as well.

[Heaving Earth]

I've always wondered if running a brushless motor at lower rpm than possible becomes inefficient. What effect does timing play based on rpm being used, if any?
I always run my tube power amps at full throttle and designate volume with the preamp. The tube amps seem to sound better when they're working at full capacity. I'm sure I'm way off but still curious

[srislash]

I definitely think there is a designed efficiency built into them. My slash runs longer on 4s than 3s based on the same mah batteries.

[Heaving Earth]

I definitely think there is a designed efficiency built into them. My slash runs longer on 4s than 3s based on the same mah batteries.

Curious

[kevinpratt823]

I definitely think there is a designed efficiency built into them. My slash runs longer on 4s than 3s based on the same mah batteries.

This is normal if using the same mah battery. The higher voltage produces more watt-hours, which is the real measure of power available.
Regaurdless, whatever Lenny's doing appears to be working well, curious what the gps would say, it looks FAST. Keep us posted when you get some longer harder runs on her!

[lenny]

Up date and a long story.

Ok the boat is running very good on 6s at 5 minutes of run time on 1 6s 40c 5000mah turnigy pack,
And temps are below 100f on the setup, Two packs in parallel would be a lot better for the setup tho.

Also I did a good blooper and torpedoed a real boat at about 30mph right in the center of the starboard side,
It was just setting in the middle of the big lake where I run and I was trying to go behind it and pass him.
And I hear a loud bang and the guy just put his hands in the air,
I said sorry and ran the boat back in to shore to check it over.
It had a 1/16"chip in the gelcoat paint on the bow tip and that was it,
On the real boat that was two weeks old I think I found a ding from my bow.
But he was cool because I fixed his prop that looked a lot worse than my prop that hit the turtle before the modding,
It is a nice boat but the lake is way to shallow for that deep V out board.

Hears a picture of the boat that I hit,
PIC_0103.jpg

But I did not get the hit on video.

[olwarbirds]

Lenny, nice vids tks for sharing....I will post some vids later this week of our pursuit running 6S Leo 4074 2200kv or 4082 2000kv and we also are not experiencing any kind of overheating or over amping probs at all..we been running 44mm props of various pitches to see which one is the best all around....DJ

[lenny]

Thanks Dale.
This last video hear is a turd but I had to share how strong the hull is and the story,
I was just watching that nice real boat running around the lake.
And you could hear the prop hitting all the old tree,
Because the water is only three to four feet deep in most spot of it.
So my eyes where not on my boat all of the time.

And yes please do post some video's when you can.

[srislash]

She sure is a looker Lenny. Shows well on the water and handles the chop well.

[lenny]

Thanks yours will be very nice to I am sure.

You are going to love how the boat handle and runs,
And it is not really hard to get setup ether.
I think on mine the bow could come down a little and in turn it would gain a little more speed,
Because when I gps it, And than move the pack 3" to the bow I gained 5 mph.
But I have just been happy with the way it is running for now.

[srislash]

So where is the CG now then Lenny? I have mine worked in at 9 5/8 from transom. But I can still change that, and there is room both ways for battery movement.

[lenny]

Mine is at 10" with no cells in the hull but it does have the stock foam in the bow,
From looking at your pictures I would think it would be back more than the 9 5/8.

In side picture of hull lay out for now.
Pursuit 004.jpgPursuit 006.jpgPursuit 005.jpgPursuit 003.jpgPursuit 008.jpg

[srislash]

I have it dead on with 4s2p Len. I should try some lighter cells I suppose before I commit to motor placement. Really want to keep my options open, should try the 6s 3300's too ;-)

[lenny]

Couple more pictures of lay out for now.

Pursuit 007.jpgPursuit 009.jpgstands 017.jpgstands 018.jpg
pursuit hull 002.jpg

[lenny]

New short video on a turnigy 6s 40c 5000mah pack and same setup,
And temps are below 100f on a full 5minute run.

Not the best video.

[rickwess]

New short video on a turnigy 6s 40c 5000mah pack and same setup,
And temps are below 100f on a full 5minute run.

Nice! I think you just talked me into a 1800kv 4082 instead of the 1600kv for my Pirate.

[srislash]

The rooster looks nice and low Len, have you cupped that prop?
Looks good, still luvin' the paint

[TheShaughnessy]

I agree with srislash . Roost looks nice and low, solid stream. That turtle must have cupped it a bit for you.

[lenny]

Not sure if it is cupped,
Now that you mention it to me.
I was going to try moving the stinger down a hair or two and see what happens with the speeds.

Pursuit 078.jpgPursuit 081.jpgPursuit 083.jpg

Rick I do not know if the 1600kv may be better way to go for just running 6s,
The 4074 1800kv is more of a test guinea pig for this boat and the cells I have on hand.

The rooster looks nice and low Len, have you cupped that prop?
Looks good, still luvin' the paint

[rickwess]

Rick I do not know if the 1600kv may be better way to go for just running 6s,
The 4074 1800kv is more of a test guinea pig for this boat and the cells I have on hand.

It's running great on 6s. I especially like, and am a little surprised, by the 5 minute run time on 5000mAh.

[lenny]

I think it would do a little better with two packs in parallel and also better for the setup to.
And yes running pretty good now,
But for how long will it run great on 6s that is the real question.

[rickwess]

Check the specs on your motor. If the max voltage is 23V,then you are on the edge. You then have to decide if you buy 4s batteries or a 4084 to go with your 6s's.