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Author Topic: BMJR Condor 2M Sailplane  (Read 930 times)
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ScratchBuildrSAM
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« on: August 13, 2016, 09:39:53 PM »

Has anyone built and flown the BMJR Condor 2M glider?
Wanting to hear how it flies.
Any tip stalling, etc.
Thanks,

ScratchBuildrSAM
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Konrad
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« Reply #1 on: August 13, 2016, 10:15:06 PM »

What do you mean by "tip stalling"? That the inboard wing tip (tip towards the center of the circle) stalls. In a real tight turn this happens with all gliders. Unless there is so much wash out that the root stalls first. If this happens most of the wing is not producing lift but rather drag.
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Cut it twice and it's still too short!
ScratchBuildrSAM
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« Reply #2 on: August 14, 2016, 08:18:32 AM »

Konrad,

Very small tip chords, typically well under three inches, are more prone to stalling than larger tip chords.

Was hoping to hear from someone with flying experience.., give a flying evaluation.

When finally built, not against adding turbulators to delay tip stall, IF, the issue actually exists.

Beautiful, interlocking, laser-cut kits with very lightweight wood!

ScratchBuildrSAM

   
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dephela
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« Reply #3 on: August 14, 2016, 08:54:18 AM »

http://www.rcgroups.com/forums/showthread.php?t=2673677
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Dennis
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« Reply #4 on: August 14, 2016, 12:16:24 PM »

Konrad,

Very small tip chords, typically well under three inches, are more prone to stalling than larger tip chords.

ScratchBuildrSAM   
So you are concerned with straight ahead high alpha stalls.

Agreed I've liked the few BMJR kits I've dealt with.
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Cut it twice and it's still too short!
lincoln
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« Reply #5 on: July 21, 2017, 12:11:52 AM »

You could try asking Rick Pendzick. He built a pretty one.
http://www.facflyer.com/condor.htm
That was some time ago. I think he's just into free flight now. Probably because I'm the one who taught him to fly RC. :-( He's a pretty patient guy who doesn't mind a challenge, recently he built a small, ff scale Fafnir!
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If the BMJR version follows the Cleveland one very closely, it's really a free flight model. For an RC glider, you'd probably want more strength in the spar. For either, a lower aspect ratio would be better, though I guess the Condor might fly MUCH better if you doubled the size and beefed up accordingly. RC gliders can use a bit of speed sometimes, which the Condor probably won't provide and might not even survive. A longer fuselage probably wouldn't hurt either.  Cleveland also offers plans for the Baby Condor. Although not quite as spectacular as the Condor, I'm guessing an enlarged one would, as an RC conversion, fly better than the Condor.
http://outerzone.co.uk/images/_thumbs/models_more/4605/008.jpg
Are you aware of Paul del Gatto's Super Condor? Very similar.

There are some other classic free flight gliders which might be better for RC.
http://outerzone.co.uk/images/_thumbs/models_more/47/004.jpg
The Super Sinbad actually makes an acceptable RC sailplane. It's a bit wiggly in yaw, and it's slow, but you can catch thermals with it easily on a good day. Or, at least, that's how it was for the few minutes I flew it.
http://outerzone.co.uk/images/_thumbs/models/4996.jpg
The Hot Shot might make a good one, though larger is better.
http://www.sam78.cz/apr_list/images/1942-spejbl.jpg
The P-411 SPEJBL might appeal to you. I think it's very pretty, despite the relatively low aspect ratio, and I think that at two meters or more it would be a good flyer.
https://aerofred.com/data/extra_images/2016/Bannsperber_001.jpg
The Bannsperber might also be good.

Outrageous vintage glider plan time sink:
http://www.sam78.cz/apr_list/samlist.php?type=1&orderby=rok
BMJR Condor 2M Sailplane
BMJR Condor 2M Sailplane
BMJR Condor 2M Sailplane
BMJR Condor 2M Sailplane
BMJR Condor 2M Sailplane
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lincoln
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« Reply #6 on: July 21, 2017, 12:13:51 AM »

P.S. Plans for most of these, in varying states of completeness, can be found on Outerzone and on that Sam 78 page I linked to in the previous post. If not, contact me and I'll try to help you out. But if Cleveland has them, get them there.

I have other links for vintage glider plans if you have more time to kill.
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