They make thread front closures. If you tapped and drilled a regular closure I think you'd have to fly it on a research day if at all because you modified the motor.

Ron

I would drill and tap thru to get the most threads possible in the foward closure. You can use a nut on the threaded portion of the eyebolt to lock the eyebolt to the closure. It also helps to set the depth to keep the threaded end flush with the delay pocket. If you don't want to use a delay or smoke grain put the nut on the inside for more strength.

I didn't know that. That's easier.
Thanks

If you don't want to use a delay or smoke grain put the nut on the inside for more strength.

If you're talking Aerotech hardware, you're guaranteeing a front closure blowout by leaving out the delay. The motor structure relies on that being there to compress the front o-ring properly. Haven't flown any AMW or Loki, though I think they all have threaded front closures.

Why risk it, just buy the threaded closure. That way, if something does go wrong on your motor, you might have a chance of it being replaced by the vendor.

Ken

Tim Thomas (lawndartman), of GLR fame, sells threaded forward closures. Check with him, that way you won't waste or damage a non-threaded, sealed forward closure.

I thought the threaded closures were only 54mm & above. I called Wildman, and sure enough he had them. I had credit I wanted to use, sorry Tim, but I'll definitely be getting the motor for this, and the alphabet shots from you.

so what is the SSSS motor this year? I wasn't at the meeting... did someone say I600? I am going to fly an I600 for the alphabet contest, assuming I don't stumble along the way... Since I biffed two A's, I'm not planning too far ahead.

I600 for SSSS

Roadrunner F60 for SSS

Estes D12 for Low & Slow

I have used an AT 38mm forward closure that had the delay well drilled out and an I-Bolt installed with a nut and washer on the inside. the rest of the delay well were the delay grain would have been is filled with water puddy. the O-ring is on the outer edge of the closer and seals no problem. the seal disk also rests against the center part of the forward closure not the delay so the delay is not needed of the forward closure is filled with something to prevent a leak through the vent hole in the delay well. If you are not sure how to do it or if it will work or not do not do it, get with someone that has or knows how or buy a plugged and threaded closure. Doing this does not change the motor from certified to non-certified.