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  #91  
Old 10-08-2019, 10:43 PM
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LeeR LeeR is offline
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The initial release of the 2157 kit had vacuformed fins. The last release of the 2157 had styrene fins. Estes offered the styrene fin kit for substituting on older kits (actually listed as replacements for the 2157 and 1969). My 2157 kits are all old, so I bought several sets. The styrene fin kits are $6.99.

The resin kits look pretty nice, but the styrene kits are decent if you are looking for an inexpensive upgrade.
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  #92  
Old 10-08-2019, 11:30 PM
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I got a couple of sets of the styrene fins for the 2157 from John Boren at NSL in Alamogordo. One pair got installed on the 2157 I got built this year. It has two flights, both on Aerotech E28s, both of which went very nicely.

I would expect resin fins would be adding even more mass where you don't want it.
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Last edited by BEC : 10-09-2019 at 01:11 PM.
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  #93  
Old 10-09-2019, 12:30 AM
BARGeezer BARGeezer is offline
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Quote:
Originally Posted by BEC
I got a couple of pairs of the styrene fins for the 2157 from John Boren at NSL in Alamogordo. One pair got installed on the 2157 I got built this year. It has two flights, both on Aerotech E28s, both of which went very nicely.

I would expect resin fins would be adding even more mass where you don't want it.

Styrene fin only: .138 oz. each
Resin fin and fairing set: .619 oz. each.
But much more durable than vacuform plastic.
Load more nose ballast to bring the CG back to the original stability margin, load up a bigger engine, and fly the bleep out of that sucker.
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  #94  
Old 10-09-2019, 08:46 AM
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Quote:
Originally Posted by BEC
I would expect resin fins would be adding even more mass where you don't want it.


That's true they are heavier; if flying on a single D you would want the styrene.

If you cluster you'll need to add some nose weight anyway and you'll have the power to compensate.

Just stay within the 5 to 1 thrust ratio and you're good no matter what.

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  #95  
Old 10-09-2019, 01:08 PM
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Fair points both BARGeezer and Verna. From those weights, you've around 1.5 ounces more at the aft end using the resin parts vs. the styrene fins and the vacuformed fairings.

I packed the CM with clay on the 2157 as I built it with a 29mm mount. Then when I saw how much ballast it would take to use the 29mm BP E/F motors I decided to back off (but left things so I could get in there if I change my mind).

So far it's flown twice—both flights nice and straight—on E28 reloads. It scoots off the rod in a rather un-Saturn-V-like fashion, but it gets high enough to properly deploy those three parachutes and look really cool on the way back down.

I had intended the 2157 build to be sort of a "dry run" for doing a 1969 for the Apollo 11 50th. Maybe I'll get the 1969 done for the Apollo 17 50th.....
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  #96  
Old 10-11-2019, 08:19 PM
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I shot the white enamel before I left for NC and I've now returned. The white is dry and rock-hard.
All remaining painting will be done by hand.

TBC
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  #97  
Old 10-12-2019, 07:49 AM
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Quote:
Originally Posted by jeffyjeep
I believe the fairings are the same as the 2157 but these fins are styrene instead of the horrible vacu-formed fins of the 2157. As for the #2001 kit I always remade the fins in basswood or birch.
I haven't opened my 1969, but I believe the fairings were created differently, on a raised portion of the vacuform, so when cut out, they more closely match the contour of the BT than the 2157. The 2157 fairings cut out flat, which require a *lot* of sanding to fit.
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