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MIG 29

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JohnPearson:
Hi All
Just flew my Mig 29 last night of the slopes at Moneymore mountains. The model is an EDF jet from the Fly Fly Hobbies range, all foam, very light and pre painted. The model is designed for two 90mm fan units, however I decided to give it a try on the slopes to see how it would handle as a PSS.
I give the model a few throws of the lower slope where we fly, with a wind blowing approx. 15mph. The lift at this spot was fair and the model flew well close to the hill, but dropped badly further out form the slope, (a long walk to the bottom of the slope).
Richard (my co-pilot and super photographer) and I, drove up onto the highest point of the second slope to see if we could get better lift. This spot is very rocky behind the slope compared with the lower slope, however we decided to give it a try, so a good throw and the Mig was away. This time the lift was better as we had hoped and the model climbed away nicely, however in the turns the Mig lost a lot of high and was very hard to control in the down wind leg. The second flight, again started of well with a good climb out away from the slope, however, again the model would not turn well and as it got further out from the slope, the climb rate was very poor and I could not get her back. ( another walk down the slope).

Overall the performance was fair, however I am not sure what the problems are, or how to solve them.

Could it be the wing section, the large open air intakes, control surfaces to small, no rubbers, mybe you guys could give me a few ideas to try before the next test flights.

Here are a few photos of the Mig 29 in action















JohnP

billscottni:
The control surfaces (ailerons and elevator) will have been designed with a fast flying EDF in  mind and may need enlarging or the throws increasing.

If it flew ell close in ie in the lift band, it may be it just needs a better wind to fly well. Wing section could possibly be a problem and perhaps a change to something like Eppler 374 would help? (would also allow you to increase aileron size)

my tuppence worth and others may know better. :wink:

JohnPearson:
Hi Bill

Thanks for the input, I think the controls surfaces do need to be increased, however the elevators are very big and she was still very poor in pitch. This model was designed for speed, therefore may be if we fly it in a stronger wind with a greater wing loading this may help with the control response. What about the large air intakes, would these cause alot of drag even with the air able to pass freely down the intakes, what do you think??

JohnP

Fred:
Hey John,

Looking really good ! Like the colour scheme !  :clap:
For the poor response, in my opinion, maybe 2 things to have a look at : CofG, and as Bill said, flying speed (I would increase the wing loading.. Maybe put a ballast system on it or something like that  :?: )

Had a F15, roughly the same size, and flying was wayyyyy too slow to generate lift, and to look like a jet ! (now proudly hanging on my garage wall  :roll: ). Made of depron, the thing was too light to be a good PSS machine...

Hope this help.

Fred - Who have a scale F16 still in a box !

DennisZ:
John, that looks great !

I'd love to see more of those with Red Stars flying ... 'cos I'm Russian ;-)

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