36DD (Dual Deployment)

The Rocketry Forum

Help Support The Rocketry Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

smstachwick

LPR/MPR sport flier with an eye to HPR and scale
TRF Supporter
Joined
Jul 29, 2021
Messages
3,907
Reaction score
3,894
Location
Poway, CA
On a routine visit to Discount Hobby Warehouse to acquire some tubing, couplers, and motors, I happened upon their OOP collection. One rocket in particular stared at me, giving me puppy dog eyes and perhaps even performing a Jedi Mind Trick. “You will take me home,” it said.

I must be pretty weak-minded fool, because I plunked down the cash for it and I’m coming up with project ideas like mad! I didn’t even wait to get home before starting this thread.

IMG_0766.jpeg

With my L1 project drawing to a close and an attempt scheduled for Saturday, I’ve been wrangling with an L2 project. LONG ago I selected a Madcow Torrent for this, but the expected apogee greater than 3000ft for a J motor in that airframe means that I can either chase it or become proficient with a DD system.

The Estes 36 D Squared, presumably given a different name during development, presents a unique platform to practice these techniques at smaller scale and relatively low cost, being equipped with a BT-60 payload bay and a transition piece to a much larger parachute compartment. I had actually wanted to get one of these for DART’s Geezer TARC competition, but EBay’s resellers were simply not forthcoming.

Aside from this I could fly it in the low-, mid- and Class 1 high-power (for sparky propellant) classification. I’ll likely end up installing a few mods to make it more friendly to typical mid- and high-power ground support and motors, namely rail buttons and papered fins.

This kit was also not super well-documented when I looked. A few people commented on some dimensional data being lacking, so I’ll be scanning everything with a ruler thrown in before assembly. Buying and documenting this kit could potentially be a service to future cloners.

Not to mention that decorating it in a hot pink paint job would certainly draw a bit of attention on the range.
 
I love my 36D Squared! That being said, it's not as beefy as you might think, and it's pretty light for DD. Don't get me wrong - it's a great flyer, but even on 2 E black powder motors, a DD setup would be a lot of weight. The "Dsquared" part of the name isn't for "dual deployment"...it's a play on words in a different way.
In my opinion (so, take it with a grain of salt), it's easier to learn dual deploy with a big mid power/L1 sized rocket. I got my level one, then built a LOC/Precision Nuke Pro Maxx with an 11" extension, and built that with an altimeter bay. It can fly in pretty much any G or H motor I can find, and does a great job with it! I relatively inexpensive way to learn dual deployment!
 
I love my 36D Squared! That being said, it's not as beefy as you might think, and it's pretty light for DD. Don't get me wrong - it's a great flyer, but even on 2 E black powder motors, a DD setup would be a lot of weight. The "Dsquared" part of the name isn't for "dual deployment"...it's a play on words in a different way.

I’m aware 😉 It lines up with my sense of humor perfectly.

Good point on the weight though. That Torrent comes with a payload bay anyway, maybe exploring the ins and outs of the L1 range with it and doing a few DD practice flights might be better.

I’ve got a bunch of ideas for strengthening the 36 D Squared to cope with the added stress of higher thrust/impulse motor but maybe I need to run a simulation or two.

Still, it was $25. Not much loss if that goal turns out to be infeasible, I have others.

In my opinion (so, take it with a grain of salt), it's easier to learn dual deploy with a big mid power/L1 sized rocket. I got my level one, then built a LOC/Precision Nuke Pro Maxx with an 11" extension, and built that with an altimeter bay. It can fly in pretty much any G or H motor I can find, and does a great job with it! I relatively inexpensive way to learn dual deployment!
You’re making that Torrent look prettier and prettier.
 
Last edited:
Making my 'pitch' once again for this thread:

https://www.rocketryforum.com/threa...aved-with-practice-psii-trainer-fleet.140897/
It was my inspiration to acquire Estes PS II parts (2.5" airframe) and build my own near-copy of a Wildman Darkstar 2.6, but in cardboard/plywood as my dual-deployment trainer.

1660' on a G80 last time with apogee and main deployments controlled by a Stratologger CF, motor eject back-up.
 
Love that rocket! I just flew my 36DD a few months ago on (2) E12-6 motors. It’s mostly stock built with the exception of a small JL Alt2 sled and vent holes in the payload bay.

I used a JL chute release at 300’, JL Alt2 shows 1,289’ altitude.

It was a beautiful flight!

I have a decent OpenRocket file for it if you’re interested.
 
I wasn't thinking ahead when I built this. I built it stock so it will only fit the 70mm D length motor, not the 97mm E length. I wish I had left the engine blocks out of it.

(2) E12-6 friction fit on the inside, a little extra tape on the outside. Don't laugh, it worked! :)


20231017_211018988_iOS.jpg
 
The kit from Esteses with fins shaped like breasteses!

So naughty. So not PC and Sexist. Original name rumored to be 36 Double D Cup (36 DD)! 36" tall, 2xD12 cluster, shapely fins. Internal Marketing and Legal memo must have said something like: "Change it. I'm sure you math guys can figure a different name out!" :)

Great kit. I had two. Flew the first one to destruction and eventually lost the second one back in the trees on two E9s and too much breeze up high.
 

Latest posts

Back
Top