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General control line discussion => Open Forum => Topic started by: Paul Taylor on May 29, 2010, 12:31:48 PM

Title: Venturi's OS engines
Post by: Paul Taylor on May 29, 2010, 12:31:48 PM

I am now ready to try my hand at making a few Venturi's.

I have a few questions about sizes. I have a OS Max-S 30 and a OS Max -25 (it does not say FP on the case). I have searched the OS web site under engine parts old and new and I can not find any information on them.

Anyone know what size the hold needs to be and how long to make them?

I have one for a FP 20-25. Will that work in the engines above?

Any info would be helpful.
Thanks
Paul

Title: Re: Venturi's OS engines
Post by: Bill Adair on May 29, 2010, 12:58:26 PM

Paul,

I have a venturi for the 25 FP, but I don't think that will work, since the FP is a higher performance engine. Someone here must have one they can measure for you. Was just leaving for the field, and will check back when I return.

My 25 FP-S venturi is .260" ID, and projects about .446" above the case opening, but I don't know if the 25 came with two venturi, like the 40 FP-S.

Also have a 35 S that should be pretty close, and will measure that for you when I get home, if you don't get an answer here first.

Bill

Title: Re: Venturi's OS engines
Post by: Bill Gruby on May 29, 2010, 01:01:28 PM

 Go to this site Paul. Find the Design board in the left column. Go there and you will find more info than you need at this point on Custom Venturis.

 http://www.clacro.de/index.htm

 "Billy G"

Title: Re: Venturi's OS engines
Post by: Paul Taylor on May 29, 2010, 01:10:27 PM

Thanks Bill and Bill.

I will try the link. Stay tooned cause I am sure I will have more silly questions. y1

Title: Re: Venturi's OS engines
Post by: john e. holliday on May 29, 2010, 04:38:56 PM

There is no silly, stupid, dumb or what ever other adjetive you can use for a question until after the fact that you should have asked the question before hand before asking the question.  Now what was the question? n~