Simple Upscale Ratios?

[DeanHFox]

Has anybody worked out a simple upscale ratios grid?

Here's what I'm trying to figure out:

If the original modroc was based on a BT-20, and you have a chunk of BT-60...what's the upscale percentage so you can figure out (quickly) how much balsa / what size NC / etc. you'd need for the upscale?

If this hasn't already been posted somewhere, I'll work something up...just thought it would save a little time if I didn't need to reinvent the wheel. :D

[snaquin]

Has anybody worked out a simple upscale ratios grid?

Here's what I'm trying to figure out:

If the original modroc was based on a BT-20, and you have a chunk of BT-60...what's the upscale percentage so you can figure out (quickly) how much balsa / what size NC / etc. you'd need for the upscale?

If this hasn't already been posted somewhere, I'll work something up...just thought it would save a little time if I didn't need to reinvent the wheel. :D

Dean

I'm not sure if this is what you are looking for .....

Scott posted a "scale data chart" spreadsheet with the building tips here at Ye Olde Rocket Shoppe:

http://www.rocketshoppe.com/tips.htm

[Bob H]

Has anybody worked out a simple upscale ratios grid?

Here's what I'm trying to figure out:

If the original modroc was based on a BT-20, and you have a chunk of BT-60...what's the upscale percentage so you can figure out (quickly) how much balsa / what size NC / etc. you'd need for the upscale?

If this hasn't already been posted somewhere, I'll work something up...just thought it would save a little time if I didn't need to reinvent the wheel. :DAll you need to do is divide the new body tube size by the old body tube size for the upscale / dowscale ratio.

1.637 (BT-60) / .736 (BT-20) = 2.22418 222% upscale.

EDIT: The Body Tube Ratio spreadsheet from the previous post works also but for me, it's easier to calculate the ratio rather than go find the spreadsheet and look it up.

[sandman]

That's all there is to that! :D

It also works the same for a downscale. BT 20 (0.736) /BT-60 (1.637) = 0.4496 or 45%

Math is our friend!

[DeanHFox]

Thanks for the replies, all.

(reminds me of the Dilbert cartoon where the boss asks Dilbert a question, and Dilbert replies with "All you need to do is divide the circumference of the table by the radius of the room" (or some such) and the boss just looks at him and says, "Don't get all mathy on me!") :D

Seriously...what I was looking for was closest to the "Body Tube Ratio Chart", but that chart is missing the "smaller" BT- sized tubes...but I'll just go ahead and do the calcs to make my own sheet for them.

As always, thanks! :)

[sandman]

Dean,

I'm confused by you last statement..."smaller body tubes"...???

Is there something smaller than a BT-2?

A launch lug maybe? :confused:

The chart seems OK to me but then again I always do the math anyway...that's just me.

Besides, I need the math thing for the fins and nose cones so I can scale them up or down. :D

[DeanHFox]

Dean,

I'm confused by you last statement..."smaller body tubes"...???

Is there something smaller than a BT-2?

A launch lug maybe? :confused:

The chart seems OK to me but then again I always do the math anyway...that's just me.

Besides, I need the math thing for the fins and nose cones so I can scale them up or down. :D
Maybe it's a terminology thing: Is a T-2 the same as a BT-2?

I was taking the chart's creator literally...he states that a "T" prefix is a Totally Tubular-produced tube, but a "BT" prefix indicates an Estes-produced tube. So there's no diff? :confused: :eek:

[sandman]

Maybe it's a terminology thing: Is a T-2 the same as a BT-2?

Yes, Jim Fackert (Totally Tubular) made up the list you are referring to. The "T" designation is his own and yes a BT-5 is the same as a T-5.

His designation system using the "T" also works with some odd sizes (Like the T-.700) and some of the Centuri sizes.

When Jim started this system nobody else was making any other distinction on tube sizes so he came up with the "T" thing.

Did I explain that right??? :confused: ..hope so..

Well there isn't an industry standard for anything smaller than a BT-3 (which was the escape motor on the 1/70th Apollo Capsule).

The BT-2 (0.246) and BT-2+ (0.281) are Micro Maxx sizes.

His selection is great for doing scale stuff....if you aren't in a big hurry! :rolleyes:

[Tau Zero]

Seriously...what I was looking for was closest to the "Body Tube Ratio Chart", but that chart is missing the "smaller" BT- sized tubes...but I'll just go ahead and do the calcs to make my own sheet for them.Like this one that I tried to send you, but maybe my e-mail filter "zapped" any of your incoming e-mails? :o

I had to "ZIP" the file since the forum didn't recognize ".xlr" as an accepted format. :eek:
It's rough, and probably Not Ready for Prime Time, but here you go anyway.


Cheers, buddy!

[DeanHFox]

Like this one that I tried to send you, but maybe my e-mail filter "zapped" any of your incoming e-mails? :o

I had to "ZIP" the file since the forum didn't recognize ".xlr" as an accepted format. :eek:
It's rough, and probably Not Ready for Prime Time, but here you go anyway.


Cheers, buddy!
You da man, Jay! That's exactly the format I was looking for. :D

Y'know, at the rate email filters are killing legit email, the day's just around the corner when email will be useless. :(

[Ltvscout]

Like this one that I tried to send you, but maybe my e-mail filter "zapped" any of your incoming e-mails? :o

I had to "ZIP" the file since the forum didn't recognize ".xlr" as an accepted format. :eek:
It's rough, and probably Not Ready for Prime Time, but here you go anyway.
What's an XLR file? What program do you use to read it? I know that XLS is an Excel Spreadsheet.

[DeanHFox]

Jay's got MS Works. The spreadsheets created in MSW are .xlr. They can easily be read by Excel, however. :)

[Ltvscout]

Jay's got MS Works. The spreadsheets created in MSW are .xlr. They can easily be read by Excel, however. :)
Ah, I didn't even try it since I never heard of that extension. Thanks.

[Ltvscout]

Like this one that I tried to send you, but maybe my e-mail filter "zapped" any of your incoming e-mails? :o

I had to "ZIP" the file since the forum didn't recognize ".xlr" as an accepted format. :eek:
It's rough, and probably Not Ready for Prime Time, but here you go anyway.
Jay,

Can I have permission to post this on the main YORS site under Building Tips?

[Tau Zero]

Can I have permission to post this on the main YORS site under Building Tips?Sure! Take it and run! (Although I'll have to get around to polishing it, eventually. :o )


What's an XLR file?(trying to keep a straight face) XLR is an "accelerator" file that makes your computer run faster. :rolleyes:

And if you believe that, I've got several thousand acres of swampland in the high desert of Southern Idaho to sell you. :eek:


Cheers,

[Ltvscout]

Sure! Take it and run! (Although I'll have to get around to polishing it, eventually. :o )
Thanks. It's now online. Send me any updates you may make to it down the road.

[Tau Zero]

Thanks. It's now online.Here 'tis, for those who need a "Nearly Direct" link:

http://www.rocketshoppe.com/tips.htm


Send me any updates you may make to it down the road.Will do!


Cheers,

[jflis]

Dean,

Here's another chart with a focus on micromaxx sizes:

http://fliskits.com/products/rocketkits/micromaxx/documents/mmx_scales.htm

jim

[Ltvscout]

Dean,

Here's another chart with a focus on micromaxx sizes:

http://fliskits.com/products/rocketkits/micromaxx/documents/mmx_scales.htm

jim
Jim,

Can I link to this in my Building Tips section on YORP?

[DeanHFox]

Dean,

Here's another chart with a focus on micromaxx sizes:

http://fliskits.com/products/rocketkits/micromaxx/documents/mmx_scales.htm

jim
Jim, that chart is *excellent*. Now I don't have any excuse for not doing some MMX downscales! :D

[jflis]

Jim,

Can I link to this in my Building Tips section on YORP?

Yep, you sure can! :)

[Tau Zero]

Send me any updates you may make to it down the road.I about drove myself nuts trying to downscale a Semroc SLS Li'l Hustler to a "Littler Hustler" ...*WITHOUT* the following spreadsheet. :eek: :mad:

Scott, it's much more polished now, so I'm not quite as embarrassed at releasing this one. :rolleyes:

Semroc and Estes aficionadoes will be happy to see that Carl McLawhorn's 3 "new" FSI tube sizes (ST-8F, -11, and -18) are also included in Version 2. I also added Estes BT-3 and -40, since Carl sells those, as well.

However, I had to draw the line *somewhere,* so I didn't bother working in the Estes BT-51, BTH-70, BT-99, -100, or -101 body tubes.


Anyway, "here's yer sign!" :D ...er, "update."


Cheers,

[Ltvscout]

Anyway, "here's yer sign!" :D ...er, "update."
Thanks. I've got the new one online now at Ye Olde Rocket Shoppe in the Building Tips section.