I liked his suggestion and will probably do that. The Frenzy XL is probably going to be my L3 rocket so that's what I'll use his tweak on.
L1 - 01/29/2011 - PML Explorer - H180 - 2429ft
L2 - 04/03/2011 - Scratch built dual-deploy - J420R - 3615ft - Raven2 altimeter
L3 - 03/23/2013 - Madcow Frenzy Xl with some extra length - M1297 - 10,600ft - (2) SL100s
Highest Altitude - 10,600 Madcow Frenzy XL on an AT M1297
16,433.0 Ns launched this year.
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I use the center rod through the altbay with 4" or over airframes, 2 offset ones on smaller bays . Most of my rockets are cardboard, Blue Tube, etc and the bulkheads are single plywood, fitting into the coupler against a slit coupler as a shoulder. The rods are all 1/2" to fit the lug on my sleds (all interchangeable) aluminum in the larger bays, wood in the under 4" rockets. In fiberglass airframe rockets, the bulkplates would be G10. The eyebolts screw into the rods both ends, all loads go through the rods rather than having the bulkplate taking the load. Never had a bulkplate fail but I have had a plywood CR fail where the eyebolt and fender washer were attached (not during a successful flight, it was a cato). Once I had the eyebolt unscrew from the altbay due to a spinning booster but making sure it's not loose prevents this. (I remove the booster end eyebolt to access the altimeter.)
I use the centered rod with eyenuts on either side like Jim. I use 1/4" plywood for my bulkheads because they are not bearing any load, just sitting there. I've never had an eyenut unscrew from a flight. It is hard to imagine how your parachute could be generating enough torque to overcome a lockwasher when the rocket end is free to rotate and not providing resistance.
NAR/Tripoli Level 3
Level 1 - LOC Minie Magg; Level 2 - PR Broken Arrow;
Level 3 - 10 inch Nike Smoke
Ns for Year: 0 but back in the USA. Builds starting today!!!!
My rockets usually fly naked. If they survive, they earn their paint.
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