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  #1  
Old 01-29-2017, 12:18 PM
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burkefj burkefj is offline
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Default Pegasus RC RG

I've been thinking about this one for a while, but didn't think I could get something flyable with the small wing the Pegasus launch vehicle has, and with the weights of components. However my recent learnings with my Mace I thought I could get something done under 11 oz with maybe a passable look and glide.

So, I scaled the wing up of course, took a crack at boost CG and moved things around in openrocket and my rc cg programs and decided on placement of components. The wing sits on sort of a platform, so I faked that with some little extensions in front and rear of the wing, with some reinforcing gussets below. Idea was to look like pegasus but be light. There seems to be a number of tail shapes and configurations in the photos I've seen, I chose one with a horizontal stab so it would match what I'm doing for the controls. Most of the photos show the fins at 120 degrees to each other, but the ones flown off of the B-52 I found were at 90 degrees to the vertical stab. Wing area is right at 1 sq foot.

Came in right at 10.75 oz, first test flight was a tiny bit pitchy on boost, but glide was much better than expected. I added 5 grams to the nose and it was very stable on boost, with a very decent glide, landing speed is faster than my others due simply to the wing loading but the drag is fairly low.

I'm hoping Stickershock can do justice to the rest of the markings.

38" long, 22" wingspan, BT-80 lightweight tubing from bms.
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Old 01-29-2017, 12:37 PM
AstronMike AstronMike is offline
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Ahh, nice, another 'Bomarcish' glider, done with BT80 and light parts.

Keep 'em coming, Frank!
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Old 01-29-2017, 07:02 PM
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burkefj burkefj is offline
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Thanks Mike, here are some flights from this morning.

http://www.youtube.com/watch?v=UHHO...eature=youtu.be
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Old 01-30-2017, 09:19 PM
Vanel Vanel is offline
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Nice!
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Old 01-30-2017, 10:21 PM
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A Fish Named Wallyum A Fish Named Wallyum is offline
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Quote:
Originally Posted by burkefj
Thanks Mike, here are some flights from this morning.

http://www.youtube.com/watch?v=UHHO...eature=youtu.be

Wow! Very cool!
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Old 01-30-2017, 11:19 PM
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mojo1986 mojo1986 is offline
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Frank, everything I've seen you do in this area of rocketry is just so exceptional! Something I'd love to see you do sometime..............an upscale (BT80?) version of the old Estes Sky Dart. For sheer grace and beauty, classic lines, nothing has, in my opinion, ever outdone it. Not sure whether it's feasible for you, but if you could do it, it would REALLY ROCK!

Joe

PS............the only other bird that approaches it for beauty is the real life Concorde (which the Sky Dart resembles).
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Old 01-31-2017, 11:14 AM
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burkefj burkefj is offline
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Thank you!

I did do a skydart style kit for two folks that used the wing I use for my StratoDart kit below but mounted on the top of the 2" tube like the skydart and with a standard ogive nose cone.....I didn't do a wider shorter chord skydart wing because i didn't think there would be enough interest, and I would have had to build a new prototype to figure out CG etc, so I used my kit as a start and just moved the wing to the top and the CG stayed the same.

For my StratoDart kits I prefer the mid mounted wing, it's simpler, the drag is more centered and I can use a center mounted motor, and I can cut the wing differently to fit into the boxes with only one joint, uses less carbon etc....I've done two versions of my StratoDart kit, one with a skydart style tail and the latest one uses a concorde style tail...and it comes with the interceptor cone. I think it looks better than the skydart but that's just me.
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