Quantcast

Fiberglass Electronics bay in an otherwise cardboard rocket

The Rocketry Forum

Help Support The Rocketry Forum:

SeanW78

Well-Known Member
Joined
Nov 8, 2019
Messages
194
Reaction score
77
Location
Sylvania, OH
Now that I'm L1 certified with a simple single deployment flight on a Madcow Super DX3, I'm looking forward to setting up dual deploy. I have a Formula 98 from Composite Warehouse, which has a nice coupler and bulkheads that just happen to nicely fit in the Madcow tube. Is there any reason I shouldn't use a fiberglass coupler/bay in a cardboard rocket?
 

timbucktoo

Well-Known Member
Staff member
TRF Supporter
Global Mod
Joined
Jun 13, 2014
Messages
7,759
Reaction score
1,136
Location
Cocoa Beach
No reason you can’t. I’ve done it myself. Might have to do some sanding to get it to fit in cardboard. I had to, I put a FG AV bay in 7-1/2” cardboard airframe and initial fit was way too tight.
 

Scott_650

Well-Known Member
Joined
Sep 16, 2015
Messages
626
Reaction score
193
the only thing I will add is harden the areas in the card board that the shear pins and rivets go into.
If this is an odd question no worries about the answer - I’m a HPR newbie with a thick skin ;)

would a plastic snap in grommet be an effective way to deal with the rivet holes? On LPR/MPR rockets I use CA on rivet holes...
 

SeanW78

Well-Known Member
Joined
Nov 8, 2019
Messages
194
Reaction score
77
Location
Sylvania, OH
the only thing I will add is harden the areas in the card board that the shear pins and rivets go into.
That's the plan. Trying to make the nav bat a workhorse that can function in my fleet of 4' rockets. I'll either glass the cardboard tubes or epoxy the inside.
 

afadeev

Well-Known Member
TRF Supporter
Joined
Sep 21, 2017
Messages
1,418
Reaction score
643
I have a Formula 98 from Composite Warehouse, which has a nice coupler and bulkheads that just happen to nicely fit in the Madcow tube. Is there any reason I shouldn't use a fiberglass coupler/bay in a cardboard rocket?
None at all, if they fit.
Many of us build a few eBay units for each diameter (2.6", 3", 4", etc), and transfer them across multiple rockets.
This is way easier, quicker, and more reliable then transferring and rewiring the electronics between different eBays and rockets.

No reason you can’t. I’ve done it myself. Might have to do some sanding to get it to fit in cardboard. I had to, I put a FG AV bay in 7-1/2” cardboard airframe and initial fit was way too tight.
That's the tricky part - cardboard, plastic, and fiberglass ID/OD sizes are non-standard. Each manufacturer sizes them as they wish. Sometimes they fit OK across tubes, other times sanding or adding layers of masking tape is required.
I don't bother with sheer pins in paper airframes. Tight fit via masking tape does the trick.

YMMV,
a
 
Top