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  #11  
Old 10-02-2009, 08:06 AM
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Ltvscout Ltvscout is offline
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One can also use the handy-dandy up/down scaling chart I have online here:

http://www.rocketshoppe.com/info/BodyTubeRatios.pdf

It's located in the Building Tips section of the Ye Olde Rocket Shoppe site.

I had this credited to Jim Fackert, but he emailed me the other week to let me know it was actually put together by Doug Scobel.

The tube sizes listed in that chart are from Totally Tubular. I still have Jim's last retail price list online here:

http://www.wooshrocketry.org/misc/tt.htm
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  #12  
Old 10-02-2009, 10:43 AM
metlfreak metlfreak is offline
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Quote:
Originally Posted by sandman
No computer program for upscaling just use a little basic math.

First figure out what size body tube you want to use.

Go to Jimz's site and download the plans.

On the finset the balsa sheet is 3" wide so use that as your reference. Print out the fin sheet.

Us a copy machine going up or down enlarging or reducing until the sheet shows that it is 3" wide.

Now to upscale

Divide the body tbe size you will be using for the main body, for example a BT-70

2.217" O.D.

by the original body size which is a BT-55 1.325" O.D.

You get 2.217/1.325=1.6732 or in other words 167%.

Blow all the dimensions up by 167%. so the main body tube (there are 2 of them and they are 5.3" long each.

So 5.3 x 1.67=8.85" long each

Just continue on from there.

Just in case you don't know all of the body tube length are on the page on the plans with the caliper scale and compass.

OH, yea when you get the fin pattern right just hit 167% on the copy machine for your fins.

Wow thanks man... I usually dont upscale so I dont have much practice so this info is great thanks alot.
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  #13  
Old 10-02-2009, 10:51 AM
metlfreak metlfreak is offline
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you guys are very helpful. I hope to kick this little project off by the end of next week. I'll post pics as things start to come together.
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  #14  
Old 10-02-2009, 10:59 AM
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sandman sandman is offline
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Quote:
Originally Posted by metlfreak
you guys are very helpful. I hope to kick this little project off by the end of next week. I'll post pics as things start to come together.


Try to keep some perspective on it.

This is not a scale model for competition. If some dimensions don't come out perfectly that's OK. You are the final judge.

Honestly, nobody would notice unless you tell them.

And if they do notice and tell you well, that's just rude.

Me, I love upscales!

Here's a few of mine.

Well some of them are downscales but it's all good.
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  #15  
Old 10-02-2009, 01:31 PM
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Quote:
Originally Posted by sandman
Try to keep some perspective on it.

This is not a scale model for competition. If some dimensions don't come out perfectly that's OK. You are the final judge.

Honestly, nobody would notice unless you tell them.

And if they do notice and tell you well, that's just rude.

/snip


What he said.......
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  #16  
Old 08-03-2019, 10:32 PM
metlfreak metlfreak is offline
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So I did build this thing 10 years ago. I used BT-80 for the outer tube. It stands 3 feet tall.
I just started painting it today...With the spray paint I bought 10 years ago for it LOL!
Its STILL not finished but I hope to finish painting it tomorrow and decal it with the Decal set I still have from 10 years ago from Sandman
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  #17  
Old 08-07-2019, 07:57 PM
metlfreak metlfreak is offline
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I should have this one finished by tomorrow. Just have to paint the bottom silver then decal it and finally after 10 years she'll be completed.
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  #18  
Old 08-08-2019, 06:56 PM
metlfreak metlfreak is offline
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Finally finished painting it.
Its not perfect but its the first time I've painted a rocket in 10 years so I'll take it!
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  #19  
Old 08-09-2019, 07:33 AM
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Looks good to me. Now launch it to the music of Ram Jam.
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  #20  
Old 08-14-2019, 11:48 PM
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Quote:
Originally Posted by metlfreak
Finally finished painting it.
Its not perfect but its the first time I've painted a rocket in 10 years so I'll take it!


Congratulations on finishing it. Ten years! Thatís about how long my scratch-built Orbital Transport sat, from completed assembly, to do all that sanding and filling and sanding and filling and ... well, it has a lot of balsa and basswood in it. Itís done and has been flown on an E18 reload using the 24/40 RMS. Next flight will be an F24.

I love upscales. Iíve got a monster Trident thatís been in the works since the 90s! Itís got 6 nose cones done, 3 more to go.

My upscale Astron Cobra is done. Iím ready to do the filling/sanding on two more ó an Astron Sky Hook, and an Astron X-Ray.
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