1st post! twin .49s?
03-24-2010, 08:37 PM
#26
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RE: 1st post! twin .49s?
I haven't posted on here in a long time. I'm a CL guy who flies 1/2a planes. I'll try to attach a picture of a Cox cylinder that came from the factory with a throttle ring. You'll notice that the throttle ring isn't on the engine. I haven't used it for years. I generally run 1/2a engines wide open till flame out. I've been using 15% nitro with 18% oil castor synthetic blend. No fuel or lube problems, but I do use an after run oil. (air tool oil)
03-24-2010, 09:09 PM
#27
RE: 1st post! twin .49s?
Perhaps you want to do a conventional twin as you mentioned but if you go to a push-pull configuration, one engine out is a non-issue and no throttle or shutoff is necessary. A single tank isn't necessary either. Even though the engines themselves turn the same direction, they are naturally torque cancelling when mounted back to back. Finding a pusher prop might be the biggest hurdle...
See Cessna 336/337 and Dornier Do 335 for the basic layout.
See Cessna 336/337 and Dornier Do 335 for the basic layout.
03-24-2010, 10:56 PM
#28
RE: 1st post! twin .49s?
ORIGINAL: fireman7875
Hate to tell ya, Bipe, but you lost the top wing too!
Brian
ORIGINAL: Bipe Flyer
Set up your thrust so that you can fly on a single engine if need be. A low with with little dihedral is less affected by thrust differential than a plane with a high wing or a lot of dihedral. I have an electric that threw a prop and all I could tell was that it was flying with less power. I didn't realize that it was flying on one motor until I landed.
Set up your thrust so that you can fly on a single engine if need be. A low with with little dihedral is less affected by thrust differential than a plane with a high wing or a lot of dihedral. I have an electric that threw a prop and all I could tell was that it was flying with less power. I didn't realize that it was flying on one motor until I landed.
Brian
03-31-2010, 08:18 PM
#29
RE: 1st post! twin .49s?
Here is a neat setup for an .049 Sure Start engine. Came across this from a friend who works at Estes and came across various engines over the years. The throttle ring has flats on it for various throttle settings - works very smooth. Could easily be setup with with a servo on a simple 3-channel model.
Brian
Brian
03-31-2010, 10:25 PM
#30
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RE: 1st post! twin .49s?
The other way to get a reverse running engine is to get a reverse crank for the TD .049 or the RC .05. I found that the TD series was inconsistent in getting good throttling so I stuffed a standard and a reverse crank into a pair of VA MK1s. They run well but the standard rotation gives me some 1K RPM more than the reverse engine. Not good in a twin.
But there's hope for another try at this. Notably, upgrading the Brodak/CS .049 with Norvel piston and liner and a Cox crank. That can be seen here. http://www.youtube.com/watch?v=ykRzLyzvaM4 Good power with good throttling. So stuffing in a reverse crank is next up when the next batch of roundtoits come in. Back-ordered AGAIN.
But there's hope for another try at this. Notably, upgrading the Brodak/CS .049 with Norvel piston and liner and a Cox crank. That can be seen here. http://www.youtube.com/watch?v=ykRzLyzvaM4 Good power with good throttling. So stuffing in a reverse crank is next up when the next batch of roundtoits come in. Back-ordered AGAIN.
