Guillows Profile Trainer 3

[Phillip Kenney]

Downloaded the plans over the weekend and rummaged through the balsa box and found I am short two 3/16 x 3" sheets to build the plane. The fuse calls for 3/4" balsa but I have 1/2" I can reinforce with some 1/8 lite ply and I have the 1/2" for the wings.
The question is, would a Fox .25BB be adequate power for this plane if the desired performance level is flying in circles to overcome dizziness? Plans show up to a .35 but that .35 would be a 60 year old design so I'm thinking the fox .25 may be at least equivalent the engine shown.

[badbill]

I learned how to fly CL on one of those in 1969. It had a .19, McCoy I think, and had plenty of power. Where'ed you find the plans?

[Dave_Trible]

I have the Trainer II and find its almost over powered with an Enya .19 on 60' lines.  I have to run it rich and use a flat pitch prop.  Your larger one should be quite well powered with the .25.  This is even more so if you fly from a smooth surface where you can get a long takeoff run.  Grass would require more power to get it going.  The II that the Topeka club uses has a Fox.19 and is launched in an idle.  It rolls pretty much a half lap or more to get lift off speed.  Once up its slow and perfect to train on.

Dave

[TigreST]

Flew one of these that was given to my brother and I, back in the mid 1970's.  We had a Testors Series 21-.35 on the nose.  What a beast  .  "Pull your arm off." is what we used to say.  That was on 70' lines too as I recall.  Now this assumes we are talking of the big one.  There was some chat about that plane here:

http://stunthanger.com/smf/stunt-design/'airfoils'-are-they-really-important/msg440294/

[James Holford]

My dad still has his!

[Phillip Kenney]

To Badbill: I really have no clue where I found the actual plans. On set was 4/5 size and finally I found one that printed out full size, 36" wingspan which I presume is correct.
Not sure on the rules about posting plans here but send me a message and I'll send you the file I had taken to the copy shop.

Flying field will most likely be a grass field. My preference for training is not to fly over hard surfaces.

[Tom Niebuhr]

Any .25 t0 .35 will work. Too much power is not good for a beginner

[Motorman]

With a Fox 25BB you'd have to put the prop on backwards.


MM

[George Albo]

I learned how to fly CL on one of those in 1969. It had a .19, McCoy I think, and had plenty of power. Where'ed you find the plans?

 http://www.hippocketaeronautics.com/hpa_plans/details.php?image_id=3550&sessionid=de53e7f35124c4626d45735ca2e1eb82

[Phillip Kenney]

Thanks for posting the link. I would have found where I got it, eventually...

[Brent Williams]

Interesting plane.  Looks like a robust trainer to get folks through the rough initial flight/crash phase! 

http://postimg.org/image/a968tcs8l/full/ (large photo size)