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  #11  
Old 10-19-2018, 03:15 PM
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Those vac-formed fins are pretty tough!!! On my Centuri model, they survived a fall after a sky-writing episode onto a wet soccer field that stuck one fin into the muddy ground Lesson learned: don't fly with a 29mm motor without the clear fins!!!!
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  #12  
Old 10-19-2018, 04:43 PM
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Quote:
Originally Posted by LeeR
Since you’ve laid claim to “I love sanding”, I’m thinking I’ll use “I love vacuformed fins” ...





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  #13  
Old 10-19-2018, 06:45 PM
stefanj stefanj is offline
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Quote:
Originally Posted by ghrocketman
Try Tenax 7R if you can find any or Tamiya Extra Thin Cement. Pure Acetone evaporates too fast. Brodak dope thinner works too as liquid plastic cement.


Heh, heh, I learned that about acetone this morning.

How about laquer thinner?

I tried the Testor's liquid cement again. I'll check how the joints held up tonight.

Either way, I'm going to make some slip-on clear fins. I have a sheet of clear butyrate around somewhere.
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  #14  
Old 10-19-2018, 07:03 PM
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Quote:
Originally Posted by stefanj
Heh, heh, I learned that about acetone this morning.

How about laquer thinner?

I tried the Testor's liquid cement again. I'll check how the joints held up tonight.

Either way, I'm going to make some slip-on clear fins. I have a sheet of clear butyrate around somewhere.

I believe I glued mine on with Testor's glue (orange tube)...I built mine before I knew about Tenex or other liquid cements.

FWIW, here is a tracing of the slip-on Centuri fins from my kit...
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  #15  
Old 10-19-2018, 07:11 PM
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I use enough nose weight to where SCALE fins are enough.
It demands MORE POWER.
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  #16  
Old 10-19-2018, 11:06 PM
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I used Testor's tube cement (orange) on my Centuri Saturn 1B and V when I was a kid, but that stuff had some heat to it. Today's version isn't worth spit.

I fairly recently built one of my Maxi V-2 reissues with Tenax-7R. Amazing stuff!!!

Unfortunately, you can't find it anymore. Next best thing is probably Plastruct Plastic Weld, Micromark "Same Stuff", or Ambroid Pro Weld. If you want to go bulk, grab a quart of MEK, which is probably more like Plaststrut.

Main ingredient for Tenax, Same Stuff, and Ambroid is methylene chloride, IIRC. I think Plastruct is mostly MEK. Some folks like Plastruct better because it flashes off a little slower than Tenax and Ambroid. I've never tried them, so I don't know. YMMV.

Plaststrut also makes a product called Bondene, but I've never seen anyone talk about it.
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  #17  
Old 10-20-2018, 10:47 AM
stefanj stefanj is offline
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Quote:
Originally Posted by rocketguy101

FWIW, here is a tracing of the slip-on Centuri fins from my kit...


Great, thanks! That's easier than I thought. I somehow pictured "folded" fins, like a taco shell, that fit over the exitsting fins.

I ordered a set of injection molded fins. I might add through-the-wall tabs to them; just 1/4", enough to protrude to the inner side of the tube, so I can add epoxy fillets.
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  #18  
Old 10-20-2018, 11:30 AM
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Quote:
Originally Posted by stefanj
Great, thanks! That's easier than I thought. I somehow pictured "folded" fins, like a taco shell, that fit over the exitsting fins.

I ordered a set of injection molded fins. I might add through-the-wall tabs to them; just 1/4", enough to protrude to the inner side of the tube, so I can add epoxy fillets.

On the Little Joe II build threads (either here or on TRF, I don't remember which) George or James illustrate using a dowel sandwiched between the fin halves to form a tab to glue into the body. I thought that rather clever.

I have a set of the Saturn V fins and like pictured on the Estes site, they are two halves glued together like LJII so adding a tab should be straight forward.
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  #19  
Old 10-20-2018, 11:54 AM
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Quote:
Originally Posted by stefanj
Great, thanks! That's easier than I thought. I somehow pictured "folded" fins, like a taco shell, that fit over the exitsting fins.
Your imagination is pretty close for classic Estes kits. The original Estes Saturn V had slip on fins made of two plastic sheets. The edges were stuck together with clear dope. (Steps 57 and 58. Also step 13 in countdown checklist)
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  #20  
Old 10-21-2018, 04:48 AM
matthew matthew is offline
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Well this is exciting - erockets have added the #1969 to their New page (out of stock). It's getting closer.
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