RCM Twin Trainer (oz5879)

About this Plan

Twin Trainer. RC model. Plan showing a modified RCM trainer 40, for twin engines.

Quote: "The RCM Twin Trainer by Brendan K Wong is designed as a twin engine trainer for two .40's. You'll find this design takes the trouble out of twin engined flying.

The RCM Twin Trainer by Brendan K. Wong is designed as a twin engine trainer for two .40's. You'll find this design takes the trouble out of twin engine flying.

How many of you have wanted a twin but couldn't afford the cost of 'practicing' on a Stand-off Scale B-25? This is a problem many would-be multi flyers face. I don't know of any company that kits a true twin engine trainer. This plane will fill that void.

About a year ago, I decided to get into radio control. I knew absolutely nothing about R/C, but had done some control-line flying, so I didn't exactly start from the bottom. A friend was already into R/C, so we met at the flying field a number of times. After a month of data gathering, I set down my plan. Due to the cost of balsa, gas and engines, I stayed with .40 powered aircraft.

Step One called for a .40 powered trainer. I also needed a radio set and an engine. A Bridi RCM Trainer 40 (oz5306) with a K & B .40 and a 5 channel Futaba set turned out to be a great combination. A Sig Kougar was my second trainer (Step Two). Both planes are great, and I'd recommend this combo to any newcomer.

Step Three would be a twin trainer. Because there weren't any kit plans available, I decided to modify my RCM 40 for twin power. Borrowing two .25's, I built two engine nacelles.and tacked them on the wing, covered up the old engine compartment and triedit. After one flight, I decided to do it right and start from scratch. BecaUse this would be a trainer, a second. twin would most likely follow: For this reason, this trainer would Use engines in the. range of what most of us can 'afford - .25 to .40. Prototype II used extended engine nacelles to get the weight up front and reduce the possibility of building tail heavy as in Prototype I. Another modification was an extension of the wing to 62 in. You'll notice some other minor changes in the plans but, other than that, it's really an RCM trainer. Model I of Prototype II weighed 5.75 lbs. with two K & B .4t0'a Since I wasn't exactly sure how this thing would fly, finish was minimum: I used Fas-Cal plastic iron-on covering. with basic black overall.

Since I had made the triming flights on my Kougar, I decided to trim out my twin myself. I had no trouble with my Kougar and hoped this twin would be as easy. After adjusting the throttles, I finally got the engines to run about the same. By the way, I don't use counter rotating engines.

I made some high speed taxi runs to adjust the nose gear, then topped off the tanks to prepare for my first flight. Both engines were adjusted for a strong four cycle at Wide open throttle. With both engines WOT, this thing goes like hell, so make sure it goes straight without much steering. There isn't much time to practice your steering skills..."

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