Found 38-54 Expansion Closures

[DabCat]

Looking for a pair of expansion closures for 38mm aerotech cases. Dr. Rocket or clones, used or new, all works. If anyone has some they are willing to sell, I would be very appreciative.

 

[jimzcatz]

Forgive my lack of understanding,but what exactly is an expansion closure?

 

[DabCat]

Here is the set offered by Dr. Rocket:


Basically an adaptor, but as the forward and aft closure.

 

[rharshberger]

Good luck, I have never seen a set of those in the wild, only photos (mostly from the Dr Rockets website).

 

[DabCat]

Good luck, I have never seen a set of those in the wild, only photos (mostly from the Dr Rockets website).

Thanks for the luck. I'm aware that this may be a long shot. I'm hoping that someone may at least have some clone closures. I have seen a few at launches, but I do agree that they seem pretty rare.

 

[jimzcatz]

I have seen those, but was never interested. Aeropak is a much better alternative in my opinion.

 

[Worsaer]

I agree with Jim. I've had some of these in the past only as collectibles. In comparison to Aeropack adapters they weigh too much to be practical.

 

[RokitFlyr]

Good luck, I have never seen a set of those in the wild, only photos (mostly from the Dr Rockets website).

I have a set. NOT selling it tho. Works great.

 

[rharshberger]

I have a set. NOT selling it tho. Works great.

Haha! Good to see you this weekend at Missle Madness.

 

[DabCat]

I agree with Jim. I've had some of these in the past only as collectibles. In comparison to Aeropack adapters they weigh too much to be practical.

I agree that they probably aren't too practical. From a cost perspective, Aeropak is way cheaper (assuming I bought a set of these closures at full retail) and allows for more flights without the need for swapping closures. Out of curiosity, how much of a weight difference is there? It doesn't seem like there is a ton more material, but I could be completely wrong.

 

[RokitFlyr]

Haha! Good to see you this weekend at Missle Madness.

You too. I'll bring 'em with me next time so you can them in person.

 

[rharshberger]

You too. I'll bring 'em with me next time so you can them in person.

cool!

 

[dhbarr]

I got a pair from an estate. Also not for sale, but I do hope to clone them someday.

 

[fyrwrxz]

Picked up a set at a vendors and promptly put them back due to the weight. I did think it was a cool solution at the time.

 

[crossfire]

Picked up a set at a vendors and promptly put them back due to the weight. I did think it was a cool solution at the time.

So what is the weight difference? They are also your motor closures. Plus weight of AP adapters. I would think weight would not much difference.

 

[CoyoteNumber2]

If you're flying a 38mm motor in a 54mm mount, an ounce or two of extra weight seems kind of moot.

 

[Rocket86]

I may have a set I could part with. I'll let you know.

 

[DabCat]

I never ended up getting any, but I did talk to one of my buddies who has one. For documentation purpose, I weighed some closures.

here is the aft expansion closure: (60 grams)

Here is the forward closure: (64 grams)


For quick reference, I weighed a few of my closure sets:

38mm forward closure: 41 grams
38mm aft closure: 24 grams
54mm forward closure: 93 grams
54mm aft closure: 31 grams

Hope this may be of help to anyone.

 

[hball55]

I have seen those, but was never interested. Aeropak is a much better alternative in my opinion.

Yes, I have the Aeropac 75/54 adapter pieces.

 

[Rocket86]

I do have a set if you're still interested. Life's been a bit busy lately and I just found them.

 

[DabCat]

I do have a set if you're still interested. Life's been a bit busy lately and I just found them.

I sent you a pm last night.

 

[DabCat]

I now have my own set! Very happy with them - thanks a bunch to Rocket86 (John). If anyone wants to see them in person, I would be happy to show them. Just let me know. I attend California launches and maybe a few of the Vegas launches.