Quantcast

Rear motor rocket gliders

The Rocketry Forum

Help Support The Rocketry Forum:

gary

Member
Joined
Apr 22, 2012
Messages
21
Reaction score
0
Who has a lot of experience with rear motor rocket gliders? I like the idea of sending up a glider that does not eject a pod or change configuration in order to transition to gliding flight. This is a difficult design criterion to satisfy. If anyone has experience/knowledge that might be helpful during the design phase I would appreciate any input/advise you can give.

Gary
 

DynaSoar

Well-Known Member
Joined
Mar 15, 2004
Messages
3,007
Reaction score
0
Originally posted by Gary
Who has a lot of experience with rear motor rocket gliders? I like the idea of sending up a glider that does not eject a pod or change configuration in order to transition to gliding flight. This is a difficult design criterion to satisfy. If anyone has experience/knowledge that might be helpful during the design phase I would appreciate any input/advise you can give.

Gary
I've got some (very) old magazines with some RG designs. I'll see if I can scan them and upload them. If they're too big I might have to email them to you.

Check JimZ's web site for plans (http://www.dars.org/jimz/rp00.htm). I know the Estes Space Plan RG is there.
 

shockwaveriderz

Well-Known Member
Joined
May 25, 2002
Messages
2,466
Reaction score
1
gary:
I'm no expert but I can point out a few resources for you to consider which should help:

Technical Report on Boost Gliders

http://www.esteseducator.com/Pdf_files/2266.pdf

also see TR-4 Rear Engined Boost Gliders in the Classic Collection:

http://www.esteseducator.com/Pdf_files/1976clas.pdf

also as Dynasoar pointed out the JimZ site will have most of the commercial rear engine designs down through the years, like the SPace Plane, the SkyDart, the Scissor wing transport which will be re-released this Fall, the Crusader scissor wing, all rear engined boost gliders......

Some or most rear engined boost gliders eject a engine pod as the model needs to have a farther forward CG during Boost as opposed to during Glide..although with elevons you could leave the engine in place and just vent the ejection charge gases...or you could consider a canard rear engined glider.. I think Edmonds Aerospace may have some rear engined canard gliders

HTH
 

DynaSoar

Well-Known Member
Joined
Mar 15, 2004
Messages
3,007
Reaction score
0
Originally posted by shockwaveriderz
Some or most rear engined boost gliders eject a engine pod as the model needs to have a farther forward CG during Boost as opposed to during Glide..although with elevons you could leave the engine in place and just vent the ejection charge gases...or you could consider a canard rear engined glider.. I think Edmonds Aerospace may have some rear engined canard gliders

HTH
I'm thinking in particular of an R&D contest winner in the Estes Model Rocket News, circa 1965. It was for an "activator tube", essentially an empty engine casing that was kicked forward by the ejection charge. The mass shift changes the CG, and the kinetic energy can do work, like flip flaps, etc.

I thought there was a TR specifically for rear boost RG, but couldn't find it.
 

edwardw

Well-Known Member
Joined
Jan 10, 2004
Messages
2,116
Reaction score
0
I saw the Geminee fly this weekend at our launch. The guy had it *dialed* in and both gliders went forever after launch. I was totally floored. It is a great little rocket.

Edward
 

SwingWing

Well-Known Member
Joined
Jan 18, 2009
Messages
1,821
Reaction score
75
Yes I love my Giminee's. Would they be considered RG or BG's?? The engine is retained, but they separate and come down as two parts. I have an 18mm clone Giminee, it is fun to launch it on different delays. Longer delay and it separates in a "downward bomburst" fashon, often with the front glider looping. (B4-2 separates upward or at apogee, B4-4 is downward burst, Longer delay = heartache)
 

KenParker

Well-Known Member
Joined
Aug 2, 2001
Messages
1,021
Reaction score
1
Orbital Engineering's VMX series are outstanding rear engine rocket gliders. They currently have the VMX-2 (18mm) and the VMX-12D (24mm).

You can see them on and buy them from DeepSkys web site.

I'm at work and very pressed for time right now. I'll try to add more to this when I get home this evening.
 

Latest posts

Top