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Engine basics => Engine set up tips => Topic started by: Tim Wescott on July 02, 2014, 04:25:04 PM

Title: OS FP 35 Venturi size
Post by: Tim Wescott on July 02, 2014, 04:25:04 PM

A friend asked me if I could make him a venturi for an OS 35 FP.

I said "sure!".

It has a stock OS needle.  I was planning on making one at whatever size the consensus here seemed to call out, and one that's 1/64" bigger, so he can mess around with what he likes best.

Title: Re: OS FP 35 Venturi size
Post by: Dane Martin on July 02, 2014, 10:14:41 PM

on suction? .250

Title: Re: OS FP 35 Venturi size
Post by: Tim Wescott on July 02, 2014, 10:35:28 PM

Suction or muffler.  He'll want it for sport/stunt flying.

Title: Re: OS FP 35 Venturi size
Post by: Steve Helmick on July 02, 2014, 11:55:00 PM

I'd say .265". Can always be drilled out later, but can also be 'reduced' with a layer or two of nylon mesh from a pair of pantyhose. I wouldn't bother to make two, unless you already made the offer.  D>K Steve