Will my flex stand up to big power?

[Make-a-Wake]

So If I go with the 1/4 cable with a 3/16 end I need a 1/4 stuffing tube and a 3/16 stinger?

Please advise.

No, you need a 1/4 stinger.............better to go beefy than wish you had for the minimal extra cost.

Yeah but a 10S 1P is gonna be like A billion $$$ a battery hahahaha

Not really..................i run 6s2p in a 39" hull and they weigh more than 10s1p, two of these would be great - http://www.hobbyking.com/hobbyking/s..._5S1P_40C.html

[keithbradley]

I love it when folks with no experience running high voltage setups try to tell others what won't work......



.

I built a cat to run on 10-12s lipo. I took a vid while testing it on 8s the first time out and posted it to youtube. Check out the comment that was left for me. It's a great example of people who don't understand HV... or FE setups in general really.

http://www.youtube.com/watch?v=Nk3b8xghF24

[Basstronics]

OK Im just going to order the speedmaster strut and shaft from Steve.

Im going to end up piecing this boat together due to the costs involved.

[photohoward1]

With that set-up and such a low kv motor. You could go all 1\4. Shaft and strut. Use a small gas prop. More to choose from anyway. Look at the pitch for the ABC props. Look for something in the 4.5 to 5" range. A nice 2414 should work. Don't listen to the 3/16th guys. No way with this set-up. You can try it but be ready to say I told you so. BTW. Batts are a 3rd of what they used to be. Cost is all relative. Good luck!

[Drax21]

I built a cat to run on 10-12s lipo. I took a vid while testing it on 8s the first time out and posted it to youtube. Check out the comment that was left for me. It's a great example of people who don't understand HV... or FE setups in general really.
http://www.youtube.com/watch?v=Nk3b8xghF24

Really nice running boat Keith. Yeah that comment on your vid looks like it's from an idiot. Your reply made me laugh

[keithbradley]

With that set-up and such a low kv motor. You could go all 1\4. Shaft and strut. Use a small gas prop. More to choose from anyway. Look at the pitch for the ABC props. Look for something in the 4.5 to 5" range. A nice 2414 should work. Don't listen to the 3/16th guys. No way with this set-up. You can try it but be ready to say I told you so. BTW. Batts are a 3rd of what they used to be. Cost is all relative. Good luck!

I'm not sure what you base this on, and I have nothing against 1/4" flex shafts (It doesn't hurt to over-build things)...but the truth is this: If you are breaking 3/16" flex shafts on a 41" mono, you failed somewhere in your build. I've set up multiple boats with 3/16" flexs and I've never broken one that was set up correctly.

I'm not saying it's a bad choice to go with 1/4".

I am saying I could build it to run 80mph on a 3/16" and it wouldn't break.

[Basstronics]

The improved performance and lower prices pulled me back into the hobby. Of course I make substantially more money that I used to 8 years or so ago.

I came over to Cleveland to fun run with you guys a very long time ago.

Either way it goes I can always switch out flex shafts on back if need be.

I looked at a few different 1/4" struts. Kintec had one with needle roller bearings. While this does sound good its been my professional experience that needle rollers cant stand up to the high RPMs our props spin. I would rather go with a bronze bearing with graphite inserts like the Speedmaster stuff. Also if I need to replace I can easily!

[photohoward1]

I'm not sure what you base this on, and I have nothing against 1/4" flex shafts (It doesn't hurt to over-build things)...but the truth is this: If you are breaking 3/16" flex shafts on a 41" mono, you failed somewhere in your build. I've set up multiple boats with 3/16" flexs and I've never broken one that was set up correctly.

I'm not saying it's a bad choice to go with 1/4".

I am saying I could build it to run 80mph on a 3/16" and it wouldn't break.

20 years of experience maybe.

We still run in Seville Ohio. You should come up.

[Make-a-Wake]

With that set-up and such a low kv motor. You could go all 1\4. Shaft and strut. Use a small gas prop. More to choose from anyway. Look at the pitch for the ABC props. Look for something in the 4.5 to 5" range. A nice 2414 should work. Don't listen to the 3/16th guys. No way with this set-up. You can try it but be ready to say I told you so. BTW. Batts are a 3rd of what they used to be. Cost is all relative. Good luck!

So you're suggesting that he run a 61mm dia prop on a 40" hull? Ever heard of torque roll? That hull can stand about a 52mm prop max to be stable.....................

That hull needs 30,000 rpms and an x447-x450. He can go 12s and use a prather s235............maybe an s240

[Basstronics]

Thanks for the prop suggestions.

You just saved me a future question :D

[keithbradley]

So you're suggesting that he run a 61mm dia prop on a 40" hull? Ever heard of torque roll? That hull can stand about a 52mm prop max to be stable.....................

That hull needs 30,000 rpms and an x447-x450. He can go 12s and use a prather s235............maybe an s240

^^^This^^^

On my 40" mono I ran a x452, x455, and s240 most of the time. I was able to get high 70s out of it on 10s with a s240 and it handled beautifuly.

This is with a x452, running in the 60s on a small lake at the time if I recall correctly:

[Drax21]

^^^This^^^

On my 40" mono I ran a x452, x455, and s240 most of the time. I was able to get high 70s out of it on 10s with a s240 and it handled beautifuly.

This is with a x452, running in the 60s on a small lake at the time if I recall correctly:

You have some fantastic running boats Keith.

So I'm going with the 5692 1000kv from HK when it is back in stock in my 41" Mono. That is a 10s motor correct?
I was originally thinking of running on 8s but don't have the funds for 4s and 5s batts.
What is your run time on 10s? and what configuration of batteries are you running?

Thanks

[Make-a-Wake]

Nope Drax, thats an 8s motor

[Drax21]

Nope Drax, thats an 8s motor

Ok thanks, I have started my build thread now. Guess I should look at buying Lipos now