Tunnel hull motor recommendations.

[marko500]

My son recently purchased a Woodstuff 32 tunnel with an OS 3.5 outdrive. He will be running a Castle Hydra 120 esc and 4s1p battery. We are wondering what motor would work with this hull. He has a Turnigy Typhoon 500 outrunner 1800 kv and also a UL-1 motor here. He uses one of the Turnigy Typhoon motors in another boat and it's a powerhouse with a ton of torque. Any other ideas on motors? Something between maybe 1800 and 2000kvs? He doesn't race only fun running.
Also any setup tips on this hull? COG, drive height, trim angle. Thanks

[BHChieftain]

I have a woodstuff hull (mine is around 29") with the same drive. I'm using an aquacraft 2030kv with an aquacraft 60A ESC on 4S1P. M440 to X442 prop, although I hear M445 also works on my setup.

I think 1800KV would be too slow on 4S-- I tried a proboat 1800KV in my setup and I was not happy with it.

Here's a recent thread on tunnel strut setup:
http://forums.offshoreelectrics.com/...ghlight=tunnel


Chief

[HTVboats]

http://www.hobbyking.com/hobbyking/s..._Inrunner.html

A Turnigy 36X74 2200kv would be a cheap alternative with plenty of power. Put a Grimracer 42X55 or X442 and it will be fast and reliable. Your Castle should be able to take it but a M445 might put you over the cliff after more than a couple passes. Check temps and have fun.
Mic

[Doby]

1800 KV AQ or PB motor would be perfect for "having fun" and would stress things less than the higher KV motors....If he just wants to have fun, thats the way to go.

[T.S.Davis]

Mark, get yourself a beast servo for that too. 300 oz is not outrageous.

[marko500]

I may pick up a AQ1800kv we can always use it in our SV. I also have a Hacker 8XL and a Fiegao 7XL and 10XL. Might just experiment, see how she runs and see what runs coolest and best. At least the motors on tunnels are a breeze to change.
Terry I have an extra 333oz titanium gear servo here. I run one of these in my PS295 and it's been great so far.
Thanks guys. Any idea where I should start at with COG? Maybe just start at the 30% + or -.

[BHChieftain]

I just prop down on my 2030kv for sport running-- just another option to consider.

Chief

[Heaving Earth]

2030 ul1 motor

[marko500]

Chief where are you running your COG? We had it on the setup board and are right around 30%

[siberianhusky]

I don't have the same hull as you (VS-1) but wasn't really too happy with it on a 1800kv Proboat motor, the 2030 UL-1 made all the difference.
Maybe it's just the way I've set them up but nitro or electric I've always had better luck with high rpm smaller prop setups. Never get it set up right in the turns running large props at lower rpm.

[Heaving Earth]

Remember, it's easier to prop down a motor that's too fast, than to have to prop up a motor that isn't enough.

[marko500]

Hey siberianhusky we have been running that Dumas Hot Shot ABS that you sent to jj2003 and we ended up with. We put a Turnigy Typhoon 1800kv outrunner in it and it's a blast. It runs nice and aired out, corners perfect and comes in ice cold. Fantastic! Easiest boat I've ever setup. I think it has either a detounged x440 or x442. Don't think I even have $100 invested in it. Sure wish all our boats ran like this one.

[siberianhusky]

Thats great! I'm glad it went to a good home and is getting run! I never ran that one, got the VS-1 a few weeks after I picked up that one.
Cheers

[BHChieftain]

Chief where are you running your COG? We had it on the setup board and are right around 30%

I don't know offhand-- the trick is to get the nose of the boat to lift at speed while avoiding blowovers and avoiding hooking in the turns.
The wildcard seems to be the propshaft angle-- some boats like some positive, some like some negative.

I'd start with the depth of the shaft at the bottom of the sponsons, and keep the angle neutral (flat). Then adjust the battery packs forward/backward to try to get the lift you want from the front of the sponsons. Say the boat rises too much with the packs all the way towards the front-- then start playing with the prop shaft angle (if rises too much with packs forward, add some negative prop shaft angle. If not enough rise with packs towards the back, then add some positive shaft angle).

On my boat, it likes the packs all the way up front, and just a hare of negative prop shaft angle...

I don't have enough experience with this hull to tell you how to cure hooking-- fortunately I don't have that problem on my boat.

Chief

[marko500]

Alright guys we just got back from the Woodstuffs first run. We only had a half hour before dark so we only had time to try 2 motors. First was the Turnigy Typhoon 1800kv outrunner. Boat ran good but wanted to cavitate on start. Not terrible but just a little. Everything came in about 100 degrees. But my son wanted it to be faster. So we stole the UL-1 motor from my tunnel. Big difference, no cavitation and alot faster. Temps were about 110 degrees on everything. Both motors were with a X442 prop, not enough time to try different ones tonight. Boat ran nice and aired out on the straights and turned great with no tendency to hook or spin out regardless of speed. Boat had a very slight bounce just before wide open throttle, Very slight. COG is at about 30% and bottom of drive shaft housing is even with setup board. Neutral trim angle.
Needless to say my son is VERY happy!