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-   -   OSC Pegasus paper model (http://www.oldrocketforum.com/showthread.php?t=14405)

blackshire 10-13-2014 01:35 AM

OSC Pegasus paper model
 
Hello All,

I just found this (see: http://www.orbital.com/LaunchSystem...per_Pegasus.pdf ) downloadable, flying paper (110# cardstock) model of OSC's (Orbital Sciences Corporation's) Pegasus air-launched satellite launch vehicle (see: http://www.orbital.com/LaunchSystem...hicles/Pegasus/ ). With low-powered (13 mm mini motor- or 18 mm "A" motor-powered rockets), this Pegasus model could be carried aloft like the old Estes Firefly parasite boost-glider.

BARGeezer 03-26-2018 08:27 PM

Clicking on the above link to the paper model pdf takes you to Orbital's home page. Here's a current link:

https://www.orbitalatk.com/flight-s...er-Airplane.pdf

blackshire 03-27-2018 09:20 AM

Quote:
Originally Posted by BARGeezer
Clicking on the above link to the paper model pdf takes you to Orbital's home page. Here's a current link:

https://www.orbitalatk.com/flight-s...er-Airplane.pdf
Thank you--those can change over time. I was just thinking--a "stick fuselage" OSC Pegasus glider (like the Estes Firefly parasite glider [the one whose wings and tail surfaces looked like--and may have been--from the Mini-Bomarc, making it a "SPEV boost-glider" if that was the case]) could fit closely atop a BT-20 fuselage with a Pegasus-like BT-20A nose cone, which could serve as a streamer-recovered booster. (A BT-50 booster with the similar-looking stubby BT-50 nose cone [the one used in the Estes Meanie kit, among others] could be used for a larger-scale Pegasus boost-glider model of this type; even larger ones could use the Big Bertha's BT-60 tubing and nose cone, or the Quest "Big Betty" [35 mm diameter, I think] tubing and nose cone.) Also:

If necessary for sufficient stability during boost, an extra, clear plastic ventral tail fin (for an original Pegasus model) or clear plastic "extensions" of the normal three Pegasus XL tail fins (which are evenly spaced) could be used. Such semi-scale models of the AQM-37 Jayhawk and AQM-81 Firebolt could be built the same way.

aeppel_cpm 03-28-2018 07:49 AM

I made a BT50 based model using a cardstock plan with a foam core 'wing'. I used the vacu-formed PNC-50 from Apogee. With a couple sinkers glued into the nose, it flies great as a rocket. Simple streamer recovery. I didn't try to make it glide.

astronwolf 03-28-2018 08:35 AM

2018 link to paper model:
https://www.orbitalatk.com/flight-s...er-Airplane.pdf

Pegasus website
https://www.orbitalatk.com/flight-s...hicles/pegasus/

blackshire 03-28-2018 08:41 AM

Quote:
Originally Posted by aeppel_cpm
I made a BT50 based model using a cardstock plan with a foam core 'wing'. I used the vacu-formed PNC-50 from Apogee. With a couple sinkers glued into the nose, it flies great as a rocket. Simple streamer recovery. I didn't try to make it glide.
That sounds promising. Estes, Quest, or one of the smaller companies could produce a detailed scale Pegasus or Pegasus XL kit, which could--like the Citation Bomarc--be either parachute (or streamer) recovered, or could be a rear-motor boost-glider (with a rear-ejection, parachute- or streamer-recovered internal motor pod).

blackshire 03-28-2018 09:21 AM

Quote:
Originally Posted by astronwolf
This is good--the card stock glider plans had "wandered," and OSC ATK's Pegasus website has the dimensions and moldline of the vehicle's payload fairing.

aeppel_cpm 03-28-2018 09:34 AM

My earlier thread:
http://oldrocketforum.com/showthread.php?t=14866

I've never tried to trim it for gliding - but I don't think it would.

My younger boy burned through a bunch of B4 and B6 motors in it one day at a club launch. I don't recall if it was TWA or WOOSH. Prep. Fly, Recover. Repeat.

blackshire 03-28-2018 11:55 AM

Quote:
Originally Posted by aeppel_cpm
My earlier thread:
http://oldrocketforum.com/showthread.php?t=14866

I've never tried to trim it for gliding - but I don't think it would.

My younger boy burned through a bunch of B4 and B6 motors in it one day at a club launch. I don't recall if it was TWA or WOOSH. Prep. Fly, Recover. Repeat.
I saw that one back then--and it's a model of the original Pegasus, no less (whose tail assembly [unlike the Pegasus XL's, whose tail fins are spaced 120 degrees apart]) is a conventional airplane-type one, which is "poorly configured" as a rocket tail assembly, yet your model still flies--vertically, as a ballistic rocket--stably. A gliding Pegasus model, if built larger but lighter (with a lower wing loading), might glide well, if fast. (As numerous YouTube videos show, many of the RC pulse jet model airplanes--low leading-edge sweep subsonic-type delta flying wings and semi-scale Heinkel He-162s are popular pulse jet models--glide quite fast after their engines cut out, but with low sink rates, even just before landing.)

aeppel_cpm 03-28-2018 12:10 PM

The tail fins are 120 degrees apart. If it doesn't look that way from the pic, it's just the perspective. I think I put 5g of noseweight in it.


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