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Gee Bee Y 50CC 97.4'' RC Airplane

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Gee Bee Y 50CC 97.4'' RC Airplane

Old 06-18-2019, 11:22 AM
  #76  
DaleD
 
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Originally Posted by hpergm View Post
I too have recently obtained the Maxford version of the plane (the V2). Came well packaged, looks great, built straight and light. I will use the Saito FG90R3 radial, which fits well. The adjustable firebox needs reinforcement to take the weight of this engine. I have ditched all CA hinges supplied for Robart hinge points and improved on the linkage hardware (Kuza/Goldwing RC). Finally ditched the supplied 5.5" wheels for 5" Robart air wheels to take up the landing suspension action (Maxford has wire gear). Need to think how to modify the bracing to provide additional side load support for the gear..



Been a while since this thread had any activity. Were you able to complete the build and fly the model? Would love to hear details on your experience based on the Model Engine Combination.

Thanks

DaleD
Old 07-25-2019, 09:37 AM
  #77  
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Hi Dale. Model has been completed and maidened. Took some tail weight to balance out the FG-90, incl mounting the 2 Rx batts behind the cockpit. Flies very nice, lands easy and has scale speed. Only peculiarity is about 15% right aileron trim, most probably due to the torque of the 24x12 prop and engine combo. Baffled the engine with an aftermarket dummy (threw away the 10-cyl joke of the kit) and added smoke. Inflatable DuBros behave perfectly.

Generally a very good purchase, great sport/Sunday platform for "everyday" use of a small radial!


Last edited by hpergm; 07-25-2019 at 09:42 AM.
Old 07-25-2019, 09:44 AM
  #78  
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And the vid from the maiden taxi trials:
(was enjoying the sound, couldn't bring myself to take her off..)
Old 11-09-2019, 11:05 AM
  #79  
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Owing to the difficulty of assebling the plan on the field (sliding on the wings with one hand, with the wheels scraping the tarmac and the other hand holding the fuz upright) I decided to build a cradle to hold the plane high up on its tube, making the wing assembly a one-handed affair. Works quite well.

Old 11-09-2019, 11:30 AM
  #80  
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The maiden flight video shows just a spec on the horizon, so let's move on to the first landing.
Things got interesting on that one: speed variations caused constant aileron trim changes, so throttling back for the approach was causing an overtrim right aileron condition compared to cruise flight/speed. After a while, I decided to start shooting approaches by just holding the roll by the stick (no time to re-trim). Best strategy was to avoid a long shallow final and apply a "carrier approach" instead in the form of a sweeping descending turn (so I could hold aileron on the same side all the time) followed by a shorter final. After a couple of approaches, it became evident that the plane was nose-heavy (nose-down upon throttle cut and the ensuing speed-up) and I was constantly overshooting the runway. Moving further away and maintaining a lower-altitude downwing leg we were finally able to land in one piece.

But not before one more surprise; a couple of dogs entered the runway, coming into our field of view right in the last seconds. This put the modified lateral cable supports of the L/G to the test because we were just able to kick rudder and swerve out of the way of one of the dogs who had entered the runway right behind us.

Needless to say, the L/G held up, the dog lived and the plane was down in one piece - thanks to some divine intervention most probably.
Nicely documented below:
Old 11-09-2019, 11:53 AM
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Originally Posted by hpergm View Post
The maiden flight video shows just a spec on the horizon, so let's move on to the first landing.
Things got interesting on that one: speed variations caused constant aileron trim changes, so throttling back for the approach was causing an overtrim right aileron condition compared to cruise flight/speed. After a while, I decided to start shooting approaches by just holding the roll by the stick (no time to re-trim). Best strategy was to avoid a long shallow final and apply a "carrier approach" instead in the form of a sweeping descending turn (so I could hold aileron on the same side all the time) followed by a shorter final. After a couple of approaches, it became evident that the plane was nose-heavy (nose-down upon throttle cut and the ensuing speed-up) and I was constantly overshooting the runway. Moving further away and maintaining a lower-altitude downwing leg we were finally able to land in one piece.

But not before one more surprise; a couple of dogs entered the runway, coming into our field of view right in the last seconds. This put the modified lateral cable supports of the L/G to the test because we were just able to kick rudder and swerve out of the way of one of the dogs who had entered the runway right behind us.

Needless to say, the L/G held up, the dog lived and the plane was down in one piece - thanks to some divine intervention most probably.
Nicely documented below:
https://youtu.be/aAuL0HrJLXw
VERY nice video, thanks for sharing. It would appear she’s needs to approach a little hot(speed) to maintain - reasonable approach slope.

I've been emailing Maxford on a monthly basis for maybe the last 4 months trying to secure one of these models. For some reason I fear they will no longer be available as Maxford has not been able to provide an ETA for new stock.

Waiting patiently

DaleD

Old 11-09-2019, 12:06 PM
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Hi Dale, thanks. I have since tweaked the CG (moved it further back) and went to a x10 pitch prop; no more aileron trim changes and lands herself like a trainer, touch and goes are out of this world. I even managed to win the GR F4C ARF Nats with her some weeks ago .

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