a heli outrunner motor for a genesis cat?!! did i miss a memo??

[martin]

Thanks, so I'm OK with my micro 17" then. Now where are those pictures?

I havnt used the warrior for some time & everything is stripped out, the pics i had all got wiped so i dont have anymore.

[lackabucks1]

Can't hurt, I never have more than a couple of cc of water in boat after run.

[lackabucks1]

Staying with original solid shafts - one of which since last night is now at the bottom of the pond. These twins sure slow down when they lose a prop. Ugh!

[limitedr1]

what martin is saying about yamahas pic is right and makes total sense to me now when compared a heli. only side force there. i just notice that you can move the cable toward the motor on and inrunner as well. and the shaft moves in and out. the bearing between the motor and the collet make sense. now with mmartin description and yamahas pic. thanks a ton both of ya!!!!

[RCboatfan2010]

Thanks guys, I think I will get a few, it does make sense to use them, rather be safe than sorry I guess

[limitedr1]

Just got a fightercat racing motor and looks like it is going to require a thrust bearing as well. Was hoping it was going to come ready to bolt in but guess not. So a thrust bearing in place of the washers and snap ring....

[lackabucks1]

Agree, but I'm using solid shafts.

[Fluid]

Guys, a thrust bearing is not required on outrunners, at least not the ones I've used. LOTS of FE guys have run them without thrust bearings for years - the motor bearings are designed to take thrust. My Scorpion outrunner 6S and 10S setups have run without thrust bearings just fine. Unless they are installed correctly, thrust bearings add heat and friction. KISS, don't fix what isn't broken.

Disclaimer: I have not run the cheap cheezy $8 outrunners so I cannot comment on their bearings......



.

[marko500]

Been seriously considering giving an outrunner a try on my tunnel hull for fun running, they sound neat and being out in the wind it should cool ok.
Hoping to save wear and tear on the pricier ul-1 racing motors, not as many of those appearing on the swap anymore!

My son has been running a Turnigy Typhoon 1800kv outrunner in that Dumas Hot Shot that was originally yours. It runs great, tons of power and it stays nice and cool. Plus it's not as heavy as the inrunner with the cooling jacket so it lowers the COG a little on a tunnel.

[Brushless55]

another thing about the thrust on out runners, is they are constantly dealing with prop thrust on a plane, so I don't think they would actually need a thrust bearing....

[martin]

I dont use thrust bearings on my outrunners, as said if you use them in aeroplanes with props or ducted fans their running at very high rpm indeed with plenty of thrust & survive fine. This is a vid of my 15" mono with a 2836 3800kv outrunner on 3s at 42000 rpm unloaded that ive run for 50+ times or more just like in this vid with mostly WOT with no probs re the front bearing taking the thrust. Its only a 4mmid x 10mm od ballbearing, i think long before the bearing would be damaged with thrust you would snake up the flex in the tube. I dont think theirs as much load being put on the bearing as you might think their is. This is only using a .098"flex. By the way this is a cheapo $12 motor Martin.

http://youtu.be/OshpHJM0opA

[limitedr1]

Wow. Guess I will put those two little washers and snap ring on and run it I guess. I would like to think fightercat know its going in a boat and build them accordingly......but who knows