David Boddington RM Trainer

[Failed Flyer]

On plan RM287 RM Trainer I can't find the ailerons, elevator and rudder settings. Looking at the Aerobat plan RM 285 the deflections for a beginner are ailerons 1/4in up. 3/16in down, elevator 3/8in each way, rudder 3/4in each way. Measuring from the RM Trainer plan would suggest ailerons 1/4in each way, elevator 3/8in each way and rudder 3/4in each way. I guess the actual dimensions were in the original build text. Can anybody confirm what they were intended to be for a beginner?...Thank you.

[Stearman65]

Posted by Failed Flyer on 14/03/2019 18:48:17:

On plan RM287 RM Trainer I can't find the ailerons, elevator and rudder settings. Looking at the Aerobat plan RM 285 the deflections for a beginner are ailerons 1/4in up. 3/16in down, elevator 3/8in each way, rudder 3/4in each way. Measuring from the RM Trainer plan would suggest ailerons 1/4in each way, elevator 3/8in each way and rudder 3/4in each way. I guess the actual dimensions were in the original build text. Can anybody confirm what they were intended to be for a beginner?...Thank you.

Why not ask the people at DB Sport & Scale?

**LINK**

Edited By Stearman65 on 14/03/2019 23:17:06

[Nigel R]

The magazine article is here

**LINK**

 

It's a great flyer. I made one a while back.

Your movements sound about right anyway. 

Edited By Nigel R on 15/03/2019 06:22:14

[kc]

DB Sport & Scale are not the people who sell the RM Trainer! David Boddington sold DB Sport & Scale when he became Radio Modeller editor and produced the RM Trainer.

I started with an RM Trainer back in 1984 and the article certainly had the control movements specified. However you should get your instructor to decide what control movements he wants - so set the maximum and then the instructor can reduce them on the rates on any modern TX

Edited By kc on 15/03/2019 09:56:43

[Nigel R]

I just checked the mag article and the movements were not given in parts 1 & 2 on outerzone. There was a part 3 which covered radio install and flying!

TBH I'd go with 1/4" up and down ailerons, 3/8" up and down elevator, 3/4" left and right rudder, and set low rates to 60%. They'll be in the right ball park.

I'll try and double check what the movements are for the Pronto as I have the book the plan was published in, and it is the same basic design, using identical wing and tail, a slightly simpler box fuselage and a different shape fin. Even easier to build.

[Mike Etheridge 1]

I can confirm there is nothing on the original RM Trainer plan or in the first 1984 magazine which only covered the fuselage structure and engine choice etc. i

[kc]

Well the control movements are in the October 1984 Radio Modeller........

Elevator five sixteenths to three eighths of an inch up and just one quarter inch down ( diiferential is desirable but not essential )

Rudder five eighths to three quarters left and right ( measured at the position of the tailplane )

Ailerons three sixteenths up and down ( differential is again desirable )

The rest of the article states the usual checks before flying - CG, controls in the correct direction, range check, check of all linkages etc etc. Sufficient rubber bands are also needed - usually six strong bands. Note the aileron wing has to be built with the reduced dihedral wing joiner.

[Failed Flyer]

Thank you all for your help. I hope to get the plane into the air soon. It is 55 years since I built a Vernon Robot with single channel RC and a Alan Mercury Am 25 motor. How the hobby has changed .I am glad I had the courage to start again. I just hope I can achieve my A certificate at my senior years! Thanks again.