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Cox Dragonfly engine

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Cox Dragonfly engine

Post  RK Flyer on Tue Dec 16, 2014 9:20 am

I saw one on E Bay for $25 & I am wondering if they were used for RC & if that would have been a good buy.

Thanks RK Flyer
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Re: Cox Dragonfly engine

Post  OVERLORD on Tue Dec 16, 2014 1:16 pm

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Re: Cox Dragonfly engine

Post  TDbandit on Tue Dec 16, 2014 2:16 pm

As Lieven stated, yes they can be used for RC and are in fact designed for it. Not only did they come stock with an exhaust throttle/muffler but they had a flexible weighted "clunked" fuel line in the tank that allowed for extended inverted flight. While not the most powerful Reedy I used to have one of these engines on a sig hummer and it was a fun little bird wish I still had it. (Bandit)
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Dragon Fly Engine

Post  RK Flyer on Tue Dec 16, 2014 6:34 pm

Thanks for the fast reply! The engine I saw had what I thought was just a muffler, so would one of these be a good way to get into RC kits?

RK Flyer
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Re: Cox Dragonfly engine

Post  TDbandit on Tue Dec 16, 2014 7:46 pm

RK Flyer wrote:Thanks for the fast reply! The engine I saw had what I thought was just a muffler, so would one of these be a good way to get into RC kits?

RK Flyer
I enjoyed mine so I would say yes just keep in mind to build the model light it's not the most powerful maybe a little better than a Babe Bee. One thing, If you decide to get this engine, this engine has a clunked tank so I would advise that after getting the engine and any hard landing that results in a sudden hard stop, give the model/engine a slight shake and listen for a clunking rattle inside the engines tank. If you hear the rattle it is OK if you don't hear the rattle, that means the weight "clunk" on the end of the fuel tubing inside the tank has been forced up towards the front of the tank and has likely pinched the fuel line. If it has, you will have to disassemble the tank to fix it if you have to do this make sure that when you reassemble the tank that you have a little clearance between the clunk and the back of the tank. If the clunk touches the back of the tank it will most likely starve the engine of fuel. (Bandit)
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Re: Cox Dragonfly engine

Post  pkrankow on Wed Dec 17, 2014 7:23 am

If you are at the field, and the "clunk" was forced to the front by a bad landing (yea, I'll be nice and say landing.  A landing requires no repairs).  Try "bouncing" the plane tail down.  No, don't drop it or do anything that will break it, but move it quickly tail first, then jerk it by the propeller and landing gear.  Stand up on something and let gravity assist you too.  Frequently this will be enough to reset the clunk to where it belongs.  

No I have never done this to a dragonfly.  Yes, I have done this to larger clunk tanks. Removing the wing must be done if possible.

Phil
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Re: Cox Dragonfly engine

Post  TDbandit on Wed Dec 17, 2014 9:13 am

pkrankow wrote:If you are at the field, and the "clunk" was forced to the front by a bad landing (yea, I'll be nice and say landing.  A landing requires no repairs).  Try "bouncing" the plane tail down.  No, don't drop it or do anything that will break it, but move it quickly tail first, then jerk it by the propeller and landing gear.  Stand up on something and let gravity assist you too.  Frequently this will be enough to reset the clunk to where it belongs.  

No I have never done this to a dragonfly.  Yes, I have done this to larger clunk tanks.  Removing the wing must be done if possible.

Phil
Great point! As far as the dragonfly is concerned, I've tried the jerk trick with my dragonfly back when I had one on my Hummer and while it can be done it just didn't work well. (clunk too light in a small tank) It takes a good hit for it to happen so it's usually a good idea to take the engine off anyway to inspect or repair the model (Bandit)
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