O3400 Min Diameter L3

The Rocketry Forum

Help Support The Rocketry Forum:

airforcetp1991

Cave Putorium
TRF Supporter
Joined
Nov 22, 2020
Messages
198
Reaction score
132
Location
New Mexico
Almost finished a 75mm CF MD build that will launch on the 28th of this month. Other than just wanting to fly a rocket this will test a new parachute wrap and line cutter setup for the eventual 98mm flight. The new setup uses smaller Piranha line cutters which save weight and minimize the mass swinging around after the apogee deployment. The 75mm will use the same single break design but with BP instead of Co2. Flight will be on an L-1420R to about Mach 2.5 and 28,000’ AGL.

D5D4CE2E-DD27-471D-A083-0EF1D8181F29.jpeg
9F4B75F4-16A6-420E-BEAF-FC481580B823.jpeg
78476655-803C-4AC9-BCF1-FD500CC31318.jpeg
47D0E9F0-107D-463D-BBA8-1A5751BCDB26.jpeg
6B93BD47-4391-4A7B-953C-589BAEC0C7F9.jpeg
A20EC37A-1656-4638-8061-D7463FC8A2F6.jpeg
BBF7D8FC-B089-4279-93F3-4DE0B701D5F4.jpeg


The new parachute wrap uses 2 15” zip ties that are linked together to allow for several wraps around the chute. This allows for a more secure wrap without sacrificing the redundancy of only needing one line cutter to fire. The picture is pretty crude but it’s about a 90% final wrap setup. This is the same 72” fruity chute that is used in the 98mm.



74604B6E-EF0F-47CD-8776-A697115CB9E6.jpeg
 

airforcetp1991

Cave Putorium
TRF Supporter
Joined
Nov 22, 2020
Messages
198
Reaction score
132
Location
New Mexico
Looks like a fine rocket @airforcetp1991!

What kind of terminal blocks are you using in this picture?

View attachment 477141

I haven't seen this kind before and am intrigued.
So those are the male ends of these wire connectors. They are waterproof and have a very strong latching mechanism. I tried as hard as I could to pull one apart by the wires and couldn’t do it. I like them because it makes it easy to attach the wires that lead to the line cutters while also keeping the AvBay sealed since the male ends are epoxied to the bulkplate. The strength of the connection also avoids the issue of the shock cord twisting and pulling the connection apart. The picture below is from my 98mm AvBay but it gives a view of what they look like from the top (before epoxying).

ZoneLiStore 2 Pin Way 18 AWG Waterproof Wire Connectors Plug 1.5mm Series Terminal Connector Pack of 10 https://www.amazon.com/dp/B07MZ5LFN...abc_Z15GFXM3N17QNYGJ6K97?_encoding=UTF8&psc=1

39857DA2-17BE-42A3-B26F-7E55E15E0A54.jpeg
 

airforcetp1991

Cave Putorium
TRF Supporter
Joined
Nov 22, 2020
Messages
198
Reaction score
132
Location
New Mexico
75mm test was a huge success. Piranha line-cutters worked flawlessly and the onboard video worked as well. O-3400 recovery chain is now flight proven, to include the chutes, line-cutters and all electronics. Fin paint on this rocket looked cool but wasn't up to the same standard as the 98mm build which had no Mach rash of any kind on its test. I am using a higher quality epoxy clear coat on the 98mm as well. 75mm flew on an AT L-1420R to Mach 2 and about 20,000' AGL.



-Tony


GoPro Snip.jpg
IMG_9681.JPG
IMG_9682.JPG
IMG_9683.JPG
 

Theory

Well-Known Member
Joined
Nov 30, 2018
Messages
1,003
Reaction score
772
nice

really dig seeing the progression in this thread.

lots of concepts being proven in the real world
 
Top