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General control line discussion => Open Forum => Topic started by: Motorman on March 27, 2013, 02:18:16 PM

Title: Veco 19 Venturi Size
Post by: Motorman on March 27, 2013, 02:18:16 PM

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Title: Re: Veco 19 Venturi Size
Post by: Garf on March 28, 2013, 05:43:34 PM

Ball bearing or plain bearing?

Title: Re: Veco 19 Venturi Size
Post by: Steve Helmick on March 28, 2013, 06:42:49 PM

It might run with a .281" insert, but that's awful big for stunt purposes. My .25LA venturi is drilled out to .272" with .156" (K&B) spraybar. That's pretty large for a .25, which is itself roughly 25% bigger in displacement than a .19 (most .19's are .199 CID). I only did that because I was going to fly it in Reno at 4,900' elevation. I would suggest starting with .257" or .265" if you're interested in stunt or sport flying the .19. Also, remember that you can make the venturi "smaller" with multiple layers of pantyhose material. How you get the pantyhose material is best left unmentioned.  #^ Steve

Title: Re: Veco 19 Venturi Size
Post by: Steve Helmick on March 30, 2013, 06:13:47 PM

A 9-4 MAS would be about 2.5" pitch, so don't think that's a useful prop! The MAS S-2 Scimitars are good props, also very underpitched, but maybe a 9-5 or 9-6 would work. The APC 9-4 and 9.5 x 4.5 would be on my list to try.  H^^ Steve