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Starter mechanism on RCV 90SP

Starting RCV 90 SP Engine

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Bill Brown 322/02/2017 15:42:36
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363 forum posts
234 photos

Hi all, I have installed an RCV 90SP engine and also bought the starter rod for cranking the motor for starting, the thing is that there is no one way drive ratchet or similar so once the engine fires up the reverse torque unscrews the starting screw which is not desirable when you have to strip the cowl back off to re install it, am I missing something here??? looking forward to some feedback.

Dwain Dibley.22/02/2017 15:48:02
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1384 forum posts
1386 photos

From my experience with helis, there is usually a one way bearing either in the clutch (heli) or on the "wand" itself.

So that under load from the starter the motor spins and when it fires and runs the wand spins freely.

D.D.

Edited By Dwain Dibley. on 22/02/2017 15:49:09

Philip Ogden22/02/2017 15:48:17
69 forum posts

You could use a helicopter starter shaft with a one-way bearing. Should be loads on ebay these days!

Jon - Laser Engines22/02/2017 15:49:31
5418 forum posts
263 photos

The only rcv i have ever dealt with was a 120 sp and we just spun the prop as normal. reaching over the model to try and use the probe thing was precarious at best and we had a number of issues with the thing jumping out and damaging the cowl, not to mention almost causing us to fall on the bloomin model!

Bill Brown 322/02/2017 16:09:05
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363 forum posts
234 photos

Thanks guys for your comments, I am inclined to go with your thoughts on this Jon, I will just have to get a geared starter as it takes a bit of turning being a geared motor.smiley

Don Fry22/02/2017 16:13:16
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4557 forum posts
54 photos

I used to use one of these for a SP 60, standing behind the prop. I never had any problems with the system, per se, except a constant awareness that any mishaps damaged the model. Went back to conventional starting in the end.

About says it all, alright engine, but a solution looking to find a problem to solve.

Solly22/02/2017 16:13:36
252 forum posts
1 photos

I have both the 90 and 120 SP engines, and have not experienced any of the problems as described by Jon. The wand will only give problems if it's worn at the end, and there is a ball ended version which makes things a bit easier. The starting screw must be attached really tightly or, as you have experienced, it will unscrew when the engine starts. It should be OK if the throttle setting is at the idle position and perhaps use some threadlock on the screw. It's only happened to me once in five years of use.

Don Fry22/02/2017 16:15:07
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4557 forum posts
54 photos

I use a cheap starter, 4s lipo, starts bigger motors than yours without hassle.

J D 822/02/2017 16:45:07
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1443 forum posts
84 photos

I am also a SP60 user and as with Solly have had few problems and always start from behind. +1 on threadlock for all screws on a RCV. Glassed a steel washer inside the cowl access hole of my AT6 to prevent starter rod damage.

Edited By J D 8 on 22/02/2017 16:46:15

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