Douglas Devastator (oz10368)

 

Douglas Devastator (oz10368) by Roland Baltes 1972 - plan thumbnail

About this Plan

Douglas Devastator. Carrier class control line scale model. For K&B 40 Power.

Quote: "Tired of Guardians? This early Navy torpedo bomber makes a very capable and colorful Class I Carrier job. Douglas Devastator, by Roland Baltes.

The Torpedo Bomber Douglas (TBD) when introduced into active Navy service in 1937 was considered the world's finest torpedo bomber. Given the name 'Devastator,' it was revolutionary when compared to its biplane predecessors. By the time World War II broke out, however, it was hopelessly obsolete and outclassed.

Over 130 were built during the era of highly colorful Navy marking schemes. This is what attracted me to select it for my next Class I Carrier model. I just could not resist the gray fuselage, yellow wings, and various colored tail surfaces, nose and fuselage bands that would make the model extremely colorful. A refreshing change to the dark blue models you normally see at Carrier contests. In addition, the Devastator qualifies for the 100 bonus points given to a scale model of a prototype airplane without question. Having flown in Carrier events for over eight years, I knew the value of having a reliable, sturdy and simple model.

It was designed to build quickly and be repairable when necessary. Most of us find out sooner or later that balsa models are not indestructible. This I proved at the 1971 NAM when I hit one of the arresting wire eye bolts during a landing attempt which broke off the wing. The rebuilding job also gave me the opportunity to try another color scheme on the Devastator - light blue/gray top surfaces and gray bottom as used during early WWII. Further information on the Devastator can be found in Profile Publication No. 171 which should be available at most well-equipped hobby shops.

The model was designed to use a 40 engine. Mine is powered by a K&B 40 rear rotary with a bolt-on exhaust slide throttle, running on pressure with a fuel metering system. Best score achieved so far was 540 points with a 105 mph high speed and 27 mph low. For those of you new to the Carrier event I suggest you stick with a stock RC 40 engine in the beginning because of the reliability this kind of engine offers. Most local contests are won by reliable engine/airplane combinations. Keep in mind that you need a complete flight in Carrier, consisting of seven laps high speed, seven laps low speed, and a 100 point landing to get a good score. High speed alone will not do it, although the scoring system favors it. If you think you are ready to challenge the record-holders let me just mention the type of equipment needed.

A good hot 40 is the basis to start with; if you can get it hopped up by someone that knows what he is doing it will help. Since max rpm is needed, forget about a venturi throttle unless it's especially made or bored out for unrestricted engine breathing. An exhaust throttle, whether it is a slide, wiper, rotating barrel, etc is most commonly used. It must close sufficiently and be adjustable to allow setting the engine idle low enough for consistent slow speed flight (at least 25 to 28 mph on a calm day). A pressure fuel system is practically a must to get max power and consistent engine runs. This then dictates using a fuel metering system during idle. Unfortunately, most of these items are not readily available at the hobby shops. I have seen the old type SuperTigre strap-on exhaust throttles used quite successfully, the hole in the baffle may have to be made smaller to get low idle. The Perry carburetors are also becoming popular especially since they incorporate a fuel metering system. Needless to say, a lot of experimenting will be required until the whole combination works consistently. To make your own exhaust throttle/fuel control system see Harry Higley's article in March 1972 AAM.

Construction. Before you start construction, decide on what engine to use since motor mount spacing may have to be changed and location of throttle pushrod from the bellcrank has to be accounted for early in the construction. Fuselage sides need to be cut out first from a sheet of 1/4 in balsa. The sides start at former 1 and follow the shape of the wing to former 3..."

Update 27/08/2018: added article, thanks to RFJ.

Supplementary file notes

Article.

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Douglas Devastator (oz10368) by Roland Baltes 1972 - model pic

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