The Big Dog comes with a 29mm motor mount tube (An AT F20-7W motor fit in it nicely) and a 24mm-29mm motor adapter.

When I visited Quest, Bill Stine showed me a built Big Dog kit with one of the BP F12 motors inserted into the motor mount.

Bill, also, jokingly inserted an AT G80 motor into the Big Dog motor mount tube. Sure, you can put a G80 into the Big Dog but would it survive?

Bob

Thank you sir, sounds good!

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Got a Caribbean soul I can barely control.....

Thanks, Bob. I thought the F20 was 29mm at first - I know the old SU, Econo-Jets were - but I had a (wrong) notion that there was a newer, 24mm F20 reload. I coulda checked first I suppose

Looking at the T50 specs on the web site - 1.97" OD, 1.92" ID - at 0.025" wall thickness, the tube appears well suited for D-E-F power, but I might wanna slap a layer of glass on if I'm gonna put a G80 in it

Doug

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YORF member #11

It's not the body tube but the fins you need to worry about if flying with an G80. The fins are surface-mount, not TTW.

Bob

I just checked the Big Dog T50 tube with AeroTech 1.88" and Centuri/Semroc ST-20 tubing.

The AT 1.88" tube fits inside of the T50 tubing while the T50 fits into ST-20. All are very smooth fitting.

Bob

I want to say someone else is now using a tube which slip fits inside the AT tube. I think Red River's P-Chuter uses that.

Doug

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YORF member #11

I thought about that

But, FWIW, I can build some dang stout surface mount fins. A bit o'glass in the fin roots along with some good fillets makes them about as good as TTW.

So, while I'm putting the glass on the Big Dog, I'd be treating the fins, too

That said, in truth, if I wanted to fly G80's in something comparable in size, I'd start with beefier components. It's easier to simply start with the right tube, and cut fins with tabs, IMO, than it is to morph a lower power bird into an HPR.


Doug

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YORF member #11

The Big Dog kit is now listed on the Quest website:

http://www.questaerospace.com/itemd...ic=5010&eq=&Tp=

Bob

Should be no problem with surface mounts on a G80 .

the balsa will shatter before a proper glue joint lets go .

we consistently flew surface mounted balsa fins on F40 projet motors, and those are full on progressive motors, a lot more violent then a G80 .

Sounds fun

Doug

You were probably thinking of the new E20W

http://www.rocketryplanet.com/content/view/3079/95/

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Steve Naquin
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