Prop blowout. Any sugestions
 

Ok I made my first run today in my older boat project, and am fairly new to this boat ,its a 32 baja, 496 ho, trs, bravo 1, 4 blade 26 p. problem is on take off drives down, if I go any faster than 4 sec. idle to full , the props blow out, same thing in a full throttle turn, slight up drive. Dose the drive angle (toe in - toe out) have any thing to do with this, or altitude ( I am at 5,400 elevation) any help would be greatly appreciated, Thanks.

force320
 

it all has to do with set up ,conditions and the props as well,

give me a call and we can TALK PROPS AND ALL your concerns.

we can get you dialed in ,will be more than glad to help ,

Thanks Darin:)

Are your props lab finished? Sounds like they are. If so you are right about where you should be for a top end set-up. Did you raise the X dimension of the out-drive? I would be surprised if you could blow-out a stock Bravo 1 with TRS drives at a normal drive height.

Try some toe-in. Start with 1/8" toe-in and see if you notice a difference, especially in turns.

Do the props blow-out in high speed turns at WOT or only at low speeds?

Matt

Altitude will definetly have something to do with it. If you don't have a diffuser ring on your props, adding one will help. So will adding some cup near the root of the blade.

cord
 

we are hiring :D you the man!!!!!!!!!!;) and add a little on the tips.

hey darin sent you a private message about prop work. let me know...

these are brand new bravo 1 solid hubs. the trs drives are in stock location, I dont know much about x dem. and what is a defuser ring.( ai know ..beginer), the drives are set at 0 toe ( strait ahead).

Now that's real interesting. Bravo 1's are amoung the best (if not the best) planing prop out there. It will have a diffuser ring built in. My thinking is that you have some other issue...

how about switching drives and turn props in.

I had a 26' cat with a high x, and ran into the same problem running a labbed 32 4 blade. We added some cup to the prop and it helped.

I eventually went to a 1.35 gear ration and dropped a couple inches in pitch. That was a cure to the problem, but lost some mid range acceleration.

I would try adding a little cup, it might be your cure.