Identify this rear deploy 2 finned rocket

[TheRocketNerd]

Okay, so this is one rocket I bought built. I don't yet know it's name; all I know is that I like it, plan to test fly it, and if all goes well, upscale it!

It lawndarted once, and a little internal surgery made into the bt-20 tube that runs external of the main BT-55tube told me that it was due to a back up of crepe paper wadding that prevented the ducted gas from the internal bt-20 (the one that houses a motor) from reaching the tube that houses the shock cord.

I repaired the damage well enough to ensure nothing will fail for a test flight, and threw some quick color on it just so I wouldn't lose sight of it for launch (paint looks horrible over unfilled spirals but I only plan on flying it once). I would really like to know what the name of this rocket is.

What's most curious to me is that the single 18mm tube that houses the motor is offset (as you'll see in the pic). It is NOT a cluster; the tube that sets outside of the BT-55 tube partly has a 1/8" shock cord attached--so it is an off-centered rear deploy little thing.

Any info would be greatly appreciated as I wouldn't even know where to begin looking on ninfinger or Jimz's...

Thanks In Advance!

 

[TheRocketNerd]

and here are the pictures. PS I'm not new to the forum or the hobby--I was TeenRocketNerd on the old TRF.

 

[dwinings]

Okay, so this is one rocket I bought built. I don't yet know it's name; all I know is that I like it, plan to test fly it, and if all goes well, upscale it!

Any info would be greatly appreciated as I wouldn't even know where to begin looking on ninfinger or Jimz's...

Thanks In Advance!

It's a Gamma, Estes Plan # 38 from MRN Volume 6 Number 1 April 1966.

Dan

 

[TheRocketNerd]

Thanks! I found the plans here https://www.spacemodeling.org/JimZ/eirp_38.htm so now I'm all set. Much obliged.:headbang: :w: I can't wait to see how it flies.

 

[TheRocketNerd]

So does anyone have any flight experience with this rocket? It seems to me as though it would be prone to an arched flight profile due to the off-centered thrust.

 

[mjennings]

I don't have experience with this rocket but it seems to me with the way the fins set up you should have enough corrective force to offset the off center line force. Just eyeball engineering though.