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General control line discussion => Open Forum => Topic started by: Avaiojet on August 12, 2012, 10:16:37 AM

Title: Twin cylinder engine experience?
Post by: Avaiojet on August 12, 2012, 10:16:37 AM: Anyone have any twin glow engine experience? Around the .35 size. Twin diesel is fine also.

Only twin I've had experience with was a Ross .60 R/C, but nothing smaller for CL.

So, I'm open to the education.

Thanks in advance.

Charles
Title: Re: Twin cylinder engine experience?
Post by: Garf on August 12, 2012, 02:58:18 PM: Very few of them out there.
Title: Re: Twin cylinder engine experience?
Post by: REX1945 on August 12, 2012, 03:10:09 PM: My observation has been that they don't generate nearly as much power per
ounce as a single cylinder. Just like a motorcycle.

I know that you don't need 2 glow igniters to start one; you just move
the single igniter to the other cylinder after starting up on one of them.
Title: Re: Twin cylinder engine experience?
Post by: Randy Powell on August 12, 2012, 03:29:12 PM: No because of what has been stated. Too heavy versus power delivered. You could try a Wankel.
Title: Re: Twin cylinder engine experience?
Post by: Mike Greb on August 17, 2012, 09:33:39 AM: One of these days I need to figure out how to use my fox 1.2 twin in a control-line model.
Title: Re: Twin cylinder engine experience?
Post by: Trostle on August 17, 2012, 09:52:30 AM: Quote from: Mike Greb on August 17, 2012, 09:33:39 AM
One of these days I need to figure out how to use my fox 1.2 twin in a control-line model.

Instructions on how to use a Fox 1.2 twin in a control-line model:

1. Bolt engine on engine mount
2. Hook up fuel line
3. Connect control-lines
4. Fill tank
5. Start engine
6. Fly around the circle
7. Do not fly near power lines
8. Do not crash

Glad to help.
Title: Re: Twin cylinder engine experience?
Post by: Dennis Moritz on August 17, 2012, 09:36:57 PM: Dan Banjok made a Fox 70 from two Fox 35s. It lines up back engine/front engine, nose of engine in back connected to crank of engine in front. Great sound, turns a 12 inch prop. The separate crankcases/needlevalves are retained. Double the power of a single Fox 35? Definitely double the power of many Foxes I've seen tuned to do a 4/2 sloppy rich. This engine sounds more like a twin Foxberg setup. It pulls around a ridiculously heavy big Profile Corsair. It is Dan's second build up. The first made it through 17 flights before the rear crank snapped. The new one looks more promising. Dan increased the diameter of the rear crank (I think), lapped the crank into a newly machined bushing, and improved the metallurgy on the pin that connects the front and rear engines. He probably did a lot else. This engine cranks. Puts out power. And weighs I imagine, about the same as 2 Fox 35s.
Title: Re: Twin cylinder engine experience?
Post by: Jim Thomerson on August 18, 2012, 08:11:46 AM: My memory sometimes makes things up, but I think I saw someone fly an airplane powered by a 4-cycle opposed twin at the last VSC.
Title: Re: Twin cylinder engine experience?
Post by: Bruce Perry on August 18, 2012, 11:50:31 PM: Please forgive the reference to the other site however, the serious research on multi cylinder use is related by me in this post http://www.clstunt.com/htdocs/dc/dcboard.php?az=show_topic&forum=103&topic_id=356749&mesg_id=356749&listing_type=search#357237

Again sorry to divert from this forum

B
Title: Re: Twin cylinder engine experience?
Post by: john e. holliday on August 19, 2012, 07:40:15 AM: Quote from: Jim Thomerson on August 18, 2012, 08:11:46 AM
My memory sometimes makes things up, but I think I saw someone fly an airplane powered by a 4-cycle opposed twin at the last VSC.

If it is the plane I saw, the second cylinder was a fake. Was it the Palmer Mars design?
Title: Re: Twin cylinder engine experience?
Post by: Jim Thomerson on August 19, 2012, 07:52:44 AM: Probably the one. That is a solution to the two cylinder engine having less power than a single cylinder of the same displacement. ::)