Modular Rocket

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Jim-K
Rocket Onlooker
Rocket Onlooker
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Joined: Mon Nov 04, 2019 9:53 pm

Modular Rocket

Postby Jim-K » Sat Nov 16, 2019 12:08 am

With the summer warming up and no flying until April/May, I have started to tinker with a modular rocket design. My aim is to make different sections that can be stuck together to mix and match different motors, recovery, staging etc.

So far, I have 3D printed some ends and tried our a few prototype sections. It all seems to work, but once I set forth with a particular interface, its going to be hard to change. Happy to listen to opinions on features to add or remove.

The basic structure is based upon BT-70 & 80 tubes. This gives plenty of room to fit stuff into the airframe later. 3D printed ends are bonded in with some balsa stringers running longitudinally and a bit of PU foam.

Here are some illustrations:

4710C058-C921-4B47-BCDA-FD6615A9BCCE.jpeg

A53B007C-C347-4CB4-977B-D64605BDF540.jpeg


I built a short section - about 120mm long - to check the longitudinal strength. About 2kN, which should be sufficient for anything I am likely to put in the back end.

2F856838-D77A-4445-BFAE-5EA7B160CB60.jpeg


The features so far are:
- Each section joined by 6 off M1.6 fasteners.
- Four pairs of balsa stringers to assist with longitudinal load.
- Two longitudinal tubes to assist with running communications.
- Radial hard points. Initially closed, but can be fitted with an M2 ‘helicoil’ as necessary.

First up I will build a tail section, a mid section with parachute and a nose section. Fly it with a 24 mm diameter E or F category, and see how we go.

316C85F5-AD01-497A-9B8B-11DD85DB0C4A.jpeg
316C85F5-AD01-497A-9B8B-11DD85DB0C4A.jpeg (22.88 KiB) Viewed 267 times


Ideally there will be time for bigger, faster, higher etc later.

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SpaceManMat
Astronaut
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Posts: 2203
Joined: Mon Dec 15, 2008 9:56 pm
Location: Brisbane

Re: Modular Rocket

Postby SpaceManMat » Sat Nov 16, 2019 7:48 am

Neat idea. It will be interesting to see how this comes together.
QRS: 124
AMRS: 32 L2 RSO
Highest Altitude: 13,647 feet
Fastest Flight: Mach 1.55
Largest Motor: CTI 1115J530 IM
Current Project: X Wing

strud
Engineer
Engineer
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Joined: Thu Oct 02, 2008 7:37 am
Location: Central Tablelands, NSW

Re: Modular Rocket

Postby strud » Sat Nov 16, 2019 11:54 am

I like modular approaches, reuse saves time and reduces risk in new projects.... theoretically.

M1.6 fasteners, wow didn't know they existed!


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