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  #1  
Old 09-14-2017, 05:07 PM
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burkefj burkefj is offline
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Default Orion Starliner RC RG

Something I've been working on. I used the general wing planform from the 2001 orion III shuttle design, but then added a appropriately shaped vertical fin(which doesn't exist on the 2001 shuttle) and used estes PS-II 2" tubing and the standard estes PSII 9.5" cone. I angle cut the rear to give the look I wanted and also to push the motor mount forward. I did not use centering rings but used a notch cut in the vertical fin tab to hold the motor mount. The vertical fin tab also locks through a notch in the wing. I played with wing location and CG to optimize the wing location and wound up with a 9.75 oz rtf model with no nose weight needed. I painted it in a shuttle like black bottom and leading/trailing edge pattern using testors flat black, then did some line markings with a sharpie and added accents on the vertical fin and wing using trim vinyl. Test flights showed a very nice boost to around 700' and a really nice glide with easy flare on landing using an E-6.

Wingspan is 25" and length is 36.5" 2" diameter.

I decided to go with TWA markings since I already have a Pan-Am marked model and "Trans World" seemed more appropriate for a space plane....

Boosts to 600-700'

Flight video here: http://www.youtube.com/watch?v=aYxOJCGfFwU&t=11s

Some flights the day before which had 10mph with 20mph gusts.....http://www.youtube.com/watch?v=CyRXuzCg_9o
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Old 09-25-2017, 09:22 PM
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burkefj burkefj is offline
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I just finished a 1.5x upscale using 3" BT-300 and a pnc-300 from BMS along with a doubled thickness wing and tail. I built it for 32mm G-12 motors, dry weight rtf is 22 oz, 26.5 oz with a G-12, no nose weight was needed. Mark at stickershock did an upsized version of the markings he did for my smaller version and they look great. 55" long, 37" wingspan. I have plans on my dynasoar website including instructions if anyone wants to reproduce it. Maiden will wait for my casing/reloads to arrive, but it's a direct scale up and I don't expect any surprises.

Frank
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  #3  
Old 09-26-2017, 07:32 PM
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neil_w neil_w is offline
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Would you expect the upscale to glide better or worse than the smaller one? I would assume it involves various ratios of weight, wing area, and this and that.

Just don't ask me what I mean by "glide better or worse" because I'm hoping you can tell me.
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Old 09-26-2017, 07:54 PM
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burkefj burkefj is offline
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At 1.5x you have 2.25x the wing area, so wing loading in this case is similar,slightly higher for the large version, however larger aircraft tend to fly slower than a direct scaling would indicate, a more useful relative comparison is the cubic wing loading, or weight in ounces divided by the wing area in sq feet raised to the 1.5 power. It allows a more direct comparison of how different size models will fly, in this case the small model is 8.6, large model is 6.8, my hypersonic delta wing is 6.54, so it should be
closer to the slower gliding plane.

In the end they are a flat plate wing sport flyer that looks cool and will never be a competition duration glider but that's not what I wanted.
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Old 09-27-2017, 08:33 AM
AstronMike AstronMike is offline
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Default Glider Upscaling

Quote:
Originally Posted by neil_w
Would you expect the upscale to glide better or worse than the smaller one? I would assume it involves various ratios of weight, wing area, and this and that.

Just don't ask me what I mean by "glide better or worse" because I'm hoping you can tell me.


In my experience with doing these sorts of things, I find that if the 'original sized' glider does well, an upscale will as well - sometimes better!

Now, as far as wing loading goes, the larger the glider, the LESS important this becomes. In fact, once you get to HPR sizes, something I call *Boost Loading* comes into play. That is basically the 'on pad weight' versus the wing area, and 'higher BL' birds tended to boost straighter - even in the 15-20mph winds I used to fly the Classic Astron SST in.

On a related note to wing loading, having a lower net WL on the upscale does NOT always portend to a better flying glider. Sometimes, yes, but not always. I've had upscale flexie RGs that did not glide nearly as well as their smaller counterparts (flex wings don't really like to carry all that extra 'rocket weight').

Sometimes you just throw out all the math and 'wet thumb' it!
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Old 10-04-2017, 12:03 PM
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burkefj burkefj is offline
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Here is the flight video from yesterday. Boost to around 600' or so.

http://www.youtube.com/watch?v=KXpDShKZP2M

Parts tracings/parts list and instructions are at: http://www.dynasoarrocketry.com/ori...ttle-plans.html
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