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  #111  
Old 03-18-2021, 07:04 PM
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georgegassaway georgegassaway is offline
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Quote:
Originally Posted by tab28682
Thought about it, but it is on the edge of OK on the chad staged D12s. If you do not hold at least an 70-80 degree climb, it builds up a little airspeed and gives off a little bit of very high pitched aileron flutter, almost like a strummed electric guitar note.... Easily fixed with a aileron counterweight, I predict.

I am a little tempted to fly it this summer, in its 40th year of existence. Might just convert it to a fixed pod and fly it on a E6 reload.

Still have a Phoenix to build for the 32mm case. Might happen, now that I am retired!


Oh, had not thought about aleron flutter an an F13 or G12 boost.

Thing is, not so sure an E6 would be enough thrust for it. Well, maybe a 45 degree tower launch, with an "accidental" blip of down to climb at first at about 30-ish degrees to be sure of eough airspeed before pulling up more steeply.

What does it weigh? Of course, all this time later, maybe you could put in even lighter new radio gear and lighter batteries, and go with fixed-pod so the lighter radio gear up front could be counteracted by the E6 reload and pod mass.

It's so weird to realize that 2-channel R/C R/G's I built in the 1980's for Cannon R/C gear, total R/C mass of about 2-2.25 ounces (with 50 mAh Nicads), can be done NOW for little more than the mass of the receiver alone (about 6/10 ounce).
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  #112  
Old 03-19-2021, 01:05 AM
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WHERE are all the Astron Skydarts ?
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  #113  
Old 03-19-2021, 02:25 PM
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Quote:
Originally Posted by ghrocketman
WHERE are all the Astron Skydarts ?


Well, here's one I made in 1999, 2X RC. Photo at an undisclosed location in 2000:



With a "Booster upgrade" in 2004.



A LOT more info, here:
http://georgesrockets.com/GRP/AOL/RBGliders/OSP/OSP.htm

I've made 2 to 3 Estes kits before that (1970's), then a "twin Skydart" model in the mid 2000's (rudder-only RC for each). Kind of like the "Space Twins", or Lunar Patrol with two gliders on each side of a core rocket.
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Last edited by georgegassaway : 03-19-2021 at 04:39 PM.
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  #114  
Old 03-19-2021, 05:36 PM
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I remember that 2X Skydart and booster. I always liked it and planned to do one for myself. Like a million other projects, I never got around to it. Maybe when I retire.
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  #115  
Old 03-19-2021, 07:10 PM
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Sometime...I want to do a 1.4X or so RC Skydart. Likely BT-55 size, but maybe 1.5X sized flying surfaces. The 2X needed a D12, but was best on E's. At about 1.4X or so, it could work pretty well on a C6, I think. More economical to fly. Ironically of all the R/C gliders, I don't have something I can just go ahead and sport fly off a normal launch pad or rod. Last time I sort of did, was an Astron Space Plane RC 2X, built mostly as a test model for the later 4X. The 2X flew on B's and C's. Had an accident though, so long gone.
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  #116  
Old 03-20-2021, 11:01 AM
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VERY nice "jumbo" Skydart and booster vehicle, George.
You have some really nice projects.
The "drone" landing Mars Lander of yours is the top of my list.
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  #117  
Old 03-20-2021, 12:12 PM
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Quote:
Originally Posted by georgegassaway
Photo at an undisclosed location in 2000:


...located somewhere maybe somewhat in the vicinity of Cheyenne Mountain...
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  #118  
Old 03-20-2021, 03:11 PM
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[deleted duplicate]
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Last edited by georgegassaway : 03-22-2021 at 02:17 PM.
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  #119  
Old 03-20-2021, 03:20 PM
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So, here is what turned into a very "deep dive" project. After the 2010 WSMC (World Championships), to develop a folding flying wing glider to fit into a very light 2" diameter FAI type body tube (I chose 2" to have a decent wing chord).




The concept was not new, but the flop-wing method for a flying wing sort of was. Had terrible yaw stability problems (as in no yaw stability) til I added half-round rudder tips, problem solved. Had a bit of a flaky glide trim though, a bit of dutch roll and glide smoothly one moment and bobble a bit too easily from a minor air current.



The wing fold method worked very well, but this was not the deep dive part.

THIS was, using the wing fold tech for a "conventional" glider, 36" span:



To fit into a 2" tube, the fuselage had to fold in 3 places, plus the horizontal stab rotate 90 degrees, plus the offset rudder to fold flat. It was a "Eureka" moment when I stopped thinking of folding the fuselage vertically (pitch axis), with all sorts of complications, to horizontally, which solved so many things.



The whole fuselage and tail, sandwiched between the folded wings.


There are reasons why I kept the project under wraps at the time, and then did not end up using them after 2012 (main thing is the FAI rules changed S4 into "Rocket Glide" after 2012, and a bit risky for NAR contest flying).

Much more info, and link to a video about the project is here:

https://tinyurl.com/n9xwf5nv
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  #120  
Old 03-21-2021, 11:35 AM
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The folding FAI glider is fantastic.

I still have an upscaled Skydart and Spaceplane on my long term RC RG build list.

I have a vintage Skydart kit stashed back, a build and flown but unpainted version of the modern Skydart II re-release and a new in bag modern re-release.

A local hobby shop, Roy’s Hobby in Hurst, Tx still had three or four of the modern version of the Skydart kits hanging on the wall when I was there last week, at the old retail price.
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