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Are you referring to the motor or battery voltage?Originally Posted by kfxguy
I'm putting the props in my shopping cart now. Should I get one bigger than the 51? They have a 54 and 57 also.
What else can I upgrade on the boat? Does anyone make a metal rudder? Are turn fins worth upgrading?
Last edited by Fischetti11358; 04-15-2014 at 04:04 PM.
Fast Electric Addict!
Yes and yes.
Here's what happens when you try to go to fast with this hull
Shockwave 26 brushless modified: http://youtu.be/hpOcOZhVuV0
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Fast Electric Addict!
Biggest I've tried is a 51. If you can, get an 80 amp proboat esc and run it on 4s with a 42-45mm prop. That's the fastest, most reliable setup. I'd keep everything else as is.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Member
Ok, so I'll just order the 48 and 51 props.
I don't see the 80 amp ESC on that site. I see the 60 amp is $115. Do you recommend another company for an ESC, or stay with PB?
Fast Electric Addict!
Proboat. You'll have to buy one used in the for sale section here when one comes up. I'd get the 42mm while your at it. When you get the esc and a 4s pack you'll need the 42mm prop. It'll do around 40mph with that setup
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Member
Do you have a link to the 80 amp ESC, maybe I can find it somewhere else.
What speeds will I be getting on a stock setup with a 3s and either the 48 or 51 prop?
Fast Electric Addict!
I think my son's does around 30-32mph on 3s with a 51mm
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Member
Nice!
How much of a difference is that over a stock prop?
Fast Electric Addict!
It did 22mph on the gps, stock on 3s. Like 16mph on 2s lol
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
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Just ordered the props! My new battery should be here Thursday!
FYI: BHCheiftan recommends that size for the IM31's
Jan has CNC'ed M642's FWIW - http://www.kintecracing.com/CNC_Machined_Props.html - have to scroll down aways. - I've been thinkin about getting one to try out on my IM31.
No prob, I was up all night. So I was a bit rough by 6am; took me awhile before it dawned on me why Fischetti11358 was being so adamit about the x435 size.
Last night I was checking out the MG24 for a BL project using a PB1500Kv motor with 90A SK speedo. Part of my research involved trying to figure out what size prop to use with that setup, that's what made me think of it.
Last edited by J.W. Pepper; 04-15-2014 at 11:41 PM. Reason: Fix Typo's
Dude - that's sick!
Have you thought about adding some glass to the interior to stiffen up the hull?? That's my only real complaint about these boats, thin plastic on the sides and especially the top rails, see attached, I drew red lines on them.
I got one of those Bondo kits I posted pix of in this thread (post #9)... https://forums.offshoreelectrics.com/...tion-need-help to reinforce mine.
Now if I could just find time.
Last edited by J.W. Pepper; 04-15-2014 at 11:59 PM. Reason: Add Pic
Fast Electric Addict!
I've tried several cnc props on numerous boats. None of them performed near as well as the carbon props and Octura props. I even sharpened and balanced one last weeked. Was the same exact prop as an Octura I had that I s&b.....was noticeably slower. I've officially given up on cnc props. As much as I hoped they would work as well...they dont.FYI: BHCheiftan recommends that size for the IM31's
Jan has CNC'ed M642's FWIW - http://www.kintecracing.com/CNC_Machined_Props.html - have to scroll down aways. - I've been thinkin about getting one to try out on my IM31.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Fast Electric Addict!
That boat you see in that video, destroyed itself. It could only take so many flips lol. My fix is I bought a 26" fiberglass hull to replace it. I just haven't put it together yet. In that video, it had a castle 1512 2650kv motor running on 4s. It was very fast.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Fast Electric Addict!
I want to be clear on something here. I know most people has their idea on a certain prop size is supposed to go with a certain hull. That may be true to a certain extent and there Wil always be exceptions. This is one of those exceptions. I have tried numerous props on this shockwave. It just likes a big as prop. The motor that come in it is a 6 pole very torquey 1500kv motor. It's only turning about 17k rpm on a fully charged 3s pack. It will swing a big prop with no problem. Wait till the op posts back. His boat is going to pick up a bunch with a prop change. I tried an x642, it went slower. M645...slower. it just likes those big carbon props.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Your right Steve is outta the Graupner carbon props, but he does have these... http://www.offshoreelectrics.com/pro...d=ose-2bld-316
Bout the ESC... get yourself a Seaking 90A unit, cheaper, better & easier to program than the PB or Dynamite units.
The motor that come in it is a 6 pole very torquey 1500kv motor. It's only turning about 17k rpm on a fully charged 3s pack...
Your absolutely right!! And the PB versions of those motors are closer to 1700Kv, I bought one from Darin Jordan while back, that's what he told me at the time. Picked up a 2nd for a spare. Can't help but wonder how the boat would do with the PB 1800kv motor from the IM31
I've been checking out this prop chart... http://www.funrcboats.com/prop_chart1.htm#Chart - the x447 has almost the same amount of total pitch as the stock prop, 2.590 vs 2.60 - that explains why this boat can swing the larger props with no prob.
Unfortunately, both Steve & these guys are out of the x445's... http://www.funrcboats.com/category.a...tpage=1&sort=4 - the say disco'ed on that page, but here... http://www.funrcboats.com/ProductInf...uctid=GR231745 - they say they're on order, ok, so which is it??
Sux, after reading your posts, I very much wanna try the x445 size (on 3S), then maybe try the larger sizes.
Can't thank enough for sharing the info, just wish it was before the props got disco'ed.
Fast Electric Addict!
Here's my story on the x642. A customer came into the shop (I started working at a hobby shop a couple months ago) and wanted a metal prop for his shockwave, at the time I didn't even know there was a brushless version. A brushed one with steerable outdrive had just left the shop and I noticed it did indeed have a 1/8 th stub shaft and assumed his would have the same.
Well I had him bring in his shockwave with his buddy who was picking up a m445 I did for a geico. I didn't really know where to go with a prop on the shockwave ( had lots of options after discovering he had a 3/16 shaft) I knew my sv27 ran well with the 642 so I said to myself, hey this is a similar power plant and hull so it should work well. I pulled out a 642 from my own collection and told him to give it a try and see how it worked. He called a couple days later and said he wanted two.
I didn't really consider it was only running 3s. PB needs a 2200 ish kv motor. Like has been said 1500 kv is low rpm for 3s. A larger prop really does need to be used but I was concerned with torque roll and prop walk, not to mention heat. Last thing I need is a customer with a smelly boat. Folks around here haven't accepted a 2 min run time so I have to limit how much prop I can recommend.
A 51 seems to be perfectly reasonable, I just figured something that large would create handling issues. I bet it would swing a x646/3 on 3s. I slapped one of those bad boys on my SV when I was starting out, finally smoked the esc when I ran 18 nihm cells in it.
Ok rambling done
Member
So, I got my new 3s lipo the other day. It's a Nano-Tech 5000mah 65-130c pack. I'm not sure what the 65-130c means. Does that mean at low throttle it's 65 and at full throttle it's at 130?
I also got my carbon props today. I ordered 42, 48 and 51mm ones. Which one should I try out first? How will each of them perform?
I am going to run the boat tomorrow, so I was just curious about the props.
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Meh....turn it does some stupid rating thing. Still don't really know what it means or if it really means anything. I go by the lower number. It's basically a 65c (rated by them anyway, prolly more like 40-45c from what I've seen). Still easily good enough for what your doing. Always try the smaller prop first then work your way up. Let me know how it runs. Make a couple passes on stock prop...change...etc then you can see the difference.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
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Will I notice a difference between the stock prop and the 42mm?
Fast Electric Addict!
You should
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
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Cool, can't wait to try it out tomorrow morning!
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I just got home from running the boat. Right when I got there, I ran my old 3s lipo on the stock prop. I knew how it performed on this, but I just wanted to get a feel for the speed of it, so I can compare it to other props and battery.
After a short run, I put on the 42mm prop. I didn't notice any difference, so I brought the boat in and put on the 48mm prop. I noticed a difference with this one and it was plenty of speed to be fun. I ran down my old 3s lipo on the 48mm prop and then I put in my new, bigger 3s lipo. On the 48mm prop and new lipo, the boat was really fast and at times, bouncing and jumping a little. I ran the new lipo for a few minutes, then I put on the 51mm prop. The 51mm was very fast off the line, almost jumping out of the water for a second. On this setup, the boat was amazing!
Now, I have a few questions. Should the front of my boat be slightly out of the water, or should the boat be planted into the water? Also, my prop should be fully submerged right? How should I adjust my rudder and fins so the boat performs better? I haven't touched them since I got the boat. How will moving them up or down make the boat perform?
Fast Electric Addict!
Told you! That puppy will move on out with the 51. Lol. Kinda goes against what most people think don't it?
I played with trim tabs and I dint have much luck. Mine ended up running the best the way it came. Knowing what I know now I could have bent the brass stuffing tube to play with it but I never did. You want it running as much out the water as you can without it chine walking or bouncing. When you play around with it you'll see what each thing does. Make only one change at a time tho! That way you can change it back if it gives you a eating effect.
32" carbon rivercat single 4s 102mph, 27” mini Rivercat 92mph, kbb34 91mph, jessej micro cat(too fast) was
Member
Thanks, I'll play around with the positions of them next time out!
By the way, my friend has the same boat, so running them together is really fun! He put his 51mm prop on first yesterday. He drove for about 30sec and he must have hit something and flipped. His hatch and inner cover came off. The inner cover sank but we eventually got the hatch back. Time to grab a roll of hatch tape!
Junior Member
So the k series 51mm prop is the way to go? Debating between the 48 and 51.
Junior Member
48 and 51mm Graupner K Series Props
48mm on 3S
http://youtu.be/l840mzqOi14
48mm on 4S
http://youtu.be/jUHtrQ2PTTA
51mm on 4S
http://youtu.be/f72leiCrD0Q
I don't have a GPS on it, any idea of how fast it is based on the video?
51mm is good on 3S also. I did have an issue with prop walk on the 51mm on 4S. Sorry my buddies talk too much in the vide. I'll try to shoot some on open water.
This is on a HK 3-4S 100A Car ESC. Got a Seaking 120 coming. Looking forward to trying 5 or 6S with a smaller prop. May reduce the chances of prop walk. Will try to prop to stay the high 30s or low 40s. I don't think this hull can handle anything faster.
Senior Member
nice job on your boat and vids.the boat works really well.you're right about the hull,i wouldn't push it too much harder.
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