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General control line discussion => Open Forum => Topic started by: Ara Dedekian on April 19, 2019, 09:19:38 AM
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Can anyone identify this plane? It's hanging on the wall of a men's clothing store in Portland Maine. It was built by the owners father in the middle to late 1930's. It's been refurbished by a local modeler for display. The engine looks to be an Ohlson on ignition.
Ara
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Tethered Trainer?
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Looks to me like it has 3 leadouts. When was throttle invented?
Gary
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Ohlsson never had throttles, but did have two speed timers. Some planes back then use a relay to change timing, with a battery in the handle. Others could have used a third line to switch back and forth between the two sets of points in the two speed timer. I think Jim Walker use a relay as shown on the Ohlsson instruction sheet in his Fireballs.
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Jim Walker's control line patent (I have a copy) shows the O&R spark timer rigged to a 3rd line, and a spring to pull it back to idle. That sort of works, but the O&R timer, if loosened enough to permit 3rd line operation, tends to get even looser, and even fall off! I think it would take some re-design of the stock timer to make that work. I've seen Walker fly a Fireball using that system. It worked for him.