# Looking to build a 29mm minimum diameter rocket - I have a few questions..

### Help Support The Rocketry Forum:

#### rockets

##### Well-Known Member
For a couple of years I have wanted to build & fly FAST rockets!! Last year I flew a 24mm diameter 20 inch tall rocket on a Ellis G37-10. It was cool, but I want to fly something a little bigger. I have a LOC 29mm motor mount tube. the tube is 8" long and I might buy this nose cone. https://www.rocketarium.com/Build/Nose-Cones/1.1
The problem is, the motor I want to fly, an AT H135, is 8 1/2" long, so could I have the motor sticking out the bottom at around 1/2 inch? According to Thrust Curve simulations, this rocket would go maybe around 10K. and around 1,000 MPH. So I will need a tracker, with little space and a low budget would you guys recommend this? https://www.apogeerockets.com/Electronics-Payloads/Rocket-Locators/MicroBeacon and for a altimeter I will either use the PerfectFlite APRA or Jolly Logic altimeter one. Since the nose cone is 6" long, would that be enough to put a recovery system, shock cord, altimeter, & tracker??

Well, if everything goes well, I'm hoping to build it this summer or maybe sooner.

That would leave you $100 of your budget for other things. You might see if someone is willing to lend you a tracker, which would also cut down on cost. The advantage of a kit is that you know that all the parts should work well for your intended purpose. If you are designing your own, I would second the suggestion of a longer body. Mr. Bob may very well have what you need in stock. Whatever you decide, please share a build thread! Is there a file for that rocket for RockSim?????? I just got RockSim Trial!!!!!! #### 75Grandville ##### Well-Known Member #### rockets ##### Well-Known Member View attachment 315298 Here's a first order approximation. Scaled from the 38mm version. If you contact MadCow they may have something closer. https://www.madcowrocketry.com/go-devil-29/ Easy Research Rocketry also has an inexpensive 29mm MD shock cord anchor: https://www.etsy.com/listing/480117942/29mm-shock-cord-anchor?ref=shop_home_active_2 Haven't used it yet, but just ordered one. Thanks for the info. I like that rocket, but I would like to fly a rocket that is more like 5 or 6 OZ. I don't have an L1, but I have a older brother with a L2 who can assist me, and I'm hoping to try out the Tripoli Mentoring Program. I'm looking at doing a scratch-build. 14 inch long body tube 6 inch long nose cone weight 5-6 OZ (3) 1/8 or 1/4 inch plywood fins kevlar shock cord big, light streamer or a small parachute OVERALL LENGTH 20 Inches _____ So what do you think of my modifications to my design?? #### rockets ##### Well-Known Member Ahhhh, Remember this is a young man venturing into this realm. I recommend keeping it simple for the first time. An Apogee Aspire clone would be simple, cheap and break Mach for him on a G80-10. With an SU motor, lose it and no big deal. This fellow may be of limited means and his youth means there is plenty of time ahead to plan big. And Oh, how my plans have changed by observing others and myself coming to the self-realization that some of what we do may look easy but getting it pulled off successfully can be quite hard. Losing a hard earned project right off can be very disheartening and going fast on a minimal investment can soften the blow. Kurt I built a 24mm minimum diameter rocket last year. Video is (up a few posts) I lost the nose cone with a$40 altimeter. Tough loss, but I am ready to build another again!!! :grin: :clap:
_________
Thanks for the info, I'll look into the Apogee Aspire.
Thanks,

#### TRFfan

I built a 24mm minimum diameter rocket last year. Video is (up a few posts) I lost the nose cone with a $40 altimeter. Tough loss, but I am ready to build another again!!! :grin: :clap: Skip to 3:48 for the launch of that rocket. _________ Thanks for the info, I'll look into the Apogee Aspire. Thanks, Do you want to build this from scratch or from a kit? #### ksaves2 ##### Lifetime Supporter TRF Lifetime Supporter I built a 24mm minimum diameter rocket last year. Video is (up a few posts) I lost the nose cone with a$40 altimeter. Tough loss, but I am ready to build another again!!! :grin: :clap:
_________
Thanks for the info, I'll look into the Apogee Aspire.
Thanks,
You're welcome! Certainly nothing wrong with planning ahead but enjoy the ride. After my L1 I jumped into a 4 inch diameter rocket I wanted to stuff an L motor in.
Unfortunately, it was out of cardboard LOC tubes I just "glassed" with a nylon stocking and bar top coating. Showed the tubes to folks "in the know" and they directed me to put "real" glass cloth and laminating epoxy over it. After that, I learned about fiberglassing fincans and read about a layered approach of going up
1/3, 2/3rds and full span layering of glass cloth on the fins to avoid fin flutter. Had to cut 12 pieces of fiberglass and talk about tedious! That was 10 years ago, the rocket is in paint, I need to wire up the two altimeters and the airframe will likely take an L1400 with no sweat. I spent the rest of the time flying smaller projects and acquiring skills along the way. This rocket will fly and since it has evolved over time, it stands a much better chance of a successful flight.

Aim high, plan much, be methodical and do not be discouraged if things don't turn out like you thought they would.

Also, did you get registered for the youth forum? You could also get advice there and compare it to what the oldsters tell you!:wink:
Kurt

Last edited:

#### rockets

##### Well-Known Member
Do you want to build this from scratch or from a kit?
Hmm, I'm not sure yet.
The hardest part is trying to find a cheap, hollow 29mm conical nose cone!!
Thanks,

#### Incongruent

##### Well-Known Member
Hmm, I'm not sure yet.
The hardest part is trying to find a cheap, hollow 29mm conical nose cone!!
Thanks,
You could roll your own with paper. There are methods to increase strength, such as soaking in CA.

#### TRFfan

##### Well-Known Member
Hmm, I'm not sure yet.
The hardest part is trying to find a cheap, hollow 29mm conical nose cone!!
Thanks,
How about getting it 3d printed?

#### dhbarr

##### Amateur Professional
How about getting it 3d printed?
Check out Easy Research Rocketry, they were offering up a conical made to fit ( IIRC ) BMS 29mm MMT. Hard to get more MD than that.

Last edited:

#### tomsteve

##### Well-Known Member
Ahhhh, Remember this is a young man venturing into this realm. I recommend keeping it simple for the first time. An Apogee Aspire clone would be simple, cheap and break Mach for him on a G80-10. With an SU motor, lose it and no big deal. This fellow may be of limited means and his youth means there is plenty of time ahead to plan big. And Oh, how my plans
have changed by observing others and myself coming to the self-realization that some of what we do may look easy but getting it pulled off successfully can be quite hard.

Losing a hard earned project right off can be very disheartening and going fast on a minimal investment can soften the blow. Kurt
I recently wrapped up a pair of scratch built aspires- I got the parts for 2 for the price of 1.
apogee has a pretty good video on making mylar streamers, which I purchased a mylar survival blanket for about \$3 on amazon. got a few streamers so far and material for quite a few more.
total weight without motor-2.6 oz and 2.8 oz. ones a 3fin and ones a 4 fin.