Thread: Pop Lugs
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Old 02-01-2009, 12:18 PM
shockwaveriderz shockwaveriderz is offline
rocket dinosaur
 
Join Date: Mar 2005
Location: My Old Kentucky Home
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moe:

pop lugs were popularized by Howard Kuhn of CMR back in the late 60's and early 70's.

I don't know if Howard actually invented them and there use, but this is who I first saw them from.

G.Harry Stine developed a clip on launch lug in the earlier 60's.

Here's a CMR plan that describes the use and construction of a standoff pop lug:


http://www.oldrocketplans.com/cmr/cmrC9/C9.pdf

Jflis currently sells pop lugs :


http://www.fliskits.com/products/01prod_fs.htm

http://www.oldrocketplans.com/pubs/CMR/pop_lug.pdf

"9.4.d Pop Lugs - A CMR pop lug described

From Fred Schecter:

A long lug (2 inches at least) or two smaller pieces of lug glued to along standoff (the standoff is long in length, but does not stand off from the rocket very far).

The standoff has bent/formed music wire epoxied to the top and bottom. The bottom piece forms a little "U" shape that captures the lower lip of the rocket body tube. The top piece is a flattened "V" (almost a point) and it is angled slightly toward the rocket. This top piece is inserted through a tiny hole in the body tube.

The entire rocket can sit on the lug while on the rod (that's why you have the lower "U"). You apply a few wraps of masking tape to the top of the launch rod and when the rocket takes off, it slides up the rod until the lug hits the tape, The lug stops ("POPS OFF") but the rocket keeps going straight since it has built up enough speed to fly stably.

The top pin MUST FIT SNUG!!!!! Otherwise it will pop off at ignition. That would be bad. "

In addition to pop lugs there are "fly-away" type launch lugs.

hth

terry dean
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