launch rod lenghts - Northern Colorado Rocketry

This topic has 9 replies, 6 voices, and was last updated 18 years, 8 months ago by Warren B. Musselman.

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May 1, 2007 at 3:08 pm #39853
mike hacker
Participant
i am planning on launching a modified estes canadian arrow this sat. at mile-hi mayhem, using a apogee f10-6. A long and slow burning motor
My rocket needs a .125 dia 2m long rod does the club have such a rod?
thanks
hondahak
May 1, 2007 at 3:22 pm #44517
Ed Dawson
I have not see one that long.

Anyone chime in if you’ve seen otherwise.

If you need 2m, is there any chance you can move up to a 1/4″ lug?
May 1, 2007 at 9:42 pm #44518
Chris LaPanse
Only a 1/8″ rod?

I don’t think we have one that long…

On the other hand, that motor has quite a thrust spike – are you sure you need that much rod? I wouldn’t think it would take that much with that rocket and that motor…
May 1, 2007 at 10:14 pm #44519
Bret Packard
Participant
Not to be critical but you probably shouldn’t be flying an F motor from an 1/8″ rod anyway.
May 1, 2007 at 10:29 pm #44520
Chris LaPanse
Normally I’d agree, but that motor is a relatively low thrust F…

It’s roughly equivalent to a D12 as far as initial kick goes.
May 1, 2007 at 11:07 pm #44521
Warren B. Musselman
Moderator
I’ve flown Apogee F10’s off 3′ and 4′ 1/8″ rods with no problem. The only problem I’ve ever had is getting them to light.

Warren
May 2, 2007 at 2:33 pm #44522
Bret Packard
Participant
Not saying it can’t be done, but 1/8″ rods are kinda like soggy noodles. Heck I don’t like flying my Lil’Nuke off our 1/4″ rods. Just my opinion, but I just can’t even imagine the rod whip you’d get out of a 2 meter 1/8″.
May 3, 2007 at 12:03 am #44523
Warren B. Musselman
Moderator
If it weighs more than a pound, you have no business flying it off a rod. Rail guidea and rails are the way to go. While NCR does maintain a nice selection of rods from the smallest 1/8″ rods up through 1/2″, fewer and fewer rocketeers build significant projects with launch lugs and as a result we will be putting out no more than 1 rod of each size on the high power size – 1/4″, 3/8″ and 1/2″. Everything else will be set up for rails. Any new pads we’re having constructed are purely rail-oriented.

Rods and launch lugs are so 1960’s…

Warren
May 3, 2007 at 1:22 am #44524
JetMechQC
Warren, what are the dimsions of the rails? I have a 2x upscale corona I’d like to fly, but i have about 1″ of clearance between the ring and the body tube. I used 3/8″ lugs. I don’t think I can get a rail to fit in that space.
May 3, 2007 at 2:20 am #44525
Warren B. Musselman
Moderator
We have a little Blacksky rail that should work for that. Maybe 3/4″ at the biggest and possibly smaller.

Warren
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