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Old 01-07-2008, 05:15 PM   #11
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you can get that tubing at the lhs and can you use the stock muffler from a DA50 there is a hole on mine and a fitting would that work ok.
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Old 01-07-2008, 06:56 PM   #12
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take a look at this one
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Old 01-07-2008, 10:10 PM   #13
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There is a new posting for a factory rebuilt sullivan skywriter advertised on RCC for $50. Sullivan is aware of the motor problem. They apparently had a bad run of motors, but back it up. It was a mfg issue and a rebuild usually resolves problem permanently. Mine still works fine after a rebuild at n/c.
John Kovats

aka Johnny Versatile

MAAC 65460

Hespeler Model Aviators Inc.
Cambridge Float Flyers

I don't have the answers, but I have a personal relationship with the Guy that does.
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Old 01-18-2008, 08:14 PM   #14
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I am trying to mount my smoke tank and know it should be over the center of gravity but I have very limited space on the CG. The only good spot I can find is slightly behind the CG. How important is it to have it right on the CG?

I have attached a picture of where I plan to mount it. The CG is marked on the edge of the fuselage in blue. Is this to far behind the CG or would it probably be ok?

Any input would be appreciated.

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Old 01-19-2008, 03:37 AM   #15
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maybe use 2 smaller smoke tanks one in front of cg and one in back offsetting the weight
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Old 01-20-2008, 05:29 PM   #16
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I setup smoke last year...

After getting my DA-50 Patty Wagstaff figured out, I decided last season totry smoke. I got a Skywriter used for half price, with tank, tubes and fittings. Here's what I know:

-Thanks to member Peter Gordon for suggesting that I build a removable module with the pump/tank, and use a dry cell 9 volt to power it. (Not sure if he got the idea from somebody else, but it was fantastic advice.) The 9 volt lasts a long time and needs no extra charge jack, charger, etc. Also 9 volts seems to be well into the "works really good" range for the pump.

-Be sure to put some real thought into tubing and heat. I used the high temperature tubing, but it was too tight on the fitting so it blew apart at the muffler on the first flight. Lots of oil everywhere!
So, I soldered in a brass tube several inches long which connects to the flexible tubing. The air in the cowling is enough to keep the brass from transmitting excessive heat to the flexible tube. However, be sure to use high temperature solder or braze it. Again, lots of oil on the plane after one flight!

-Do plan ahead with the pump programming. I was careful to setup a full range of motion on my radio before my first flight. I took a conservative guess and set the pump to run at about 30%. That was still too high.

-Don't get lost in the sea of suggestions for smoke oil recipes. By the aviation smoke oil and be done with it. It's pricey, but for your first season, you won't go broke and you can be sure that the aviation oil is a pretty safe thing to get on your plane. I found it to be far less offensive that glow fuel residue and it did not eat or discolor anything. Once you have your system perfected, and you are sure that you have no leaks then you can try homemade oils.

Be sure to plan for space and plan for CofG.

Smoke is fun and it gets a lot of attention.
If you're not part of the solution... you may be insoluble!
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