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-   -   motor size? (https://www.rcuniverse.com/forum/rc-airboats-246/7078023-motor-size.html)

flytahoe43 02-15-2008 01:26 AM

motor size?
 
Hey is there anything against using a .75 in an airboat? Ive got an extra and want to do sumthin with it.

Also, where is a good place to start? Never done this before.

jasperrc 02-15-2008 08:13 AM

RE: motor size?
 
Nothing at all wrong with using that motor on an airboat.

What are you looking for in your boat? Classic handling with sliding turns, all out speed, precise control?

What kind of hull are you interested in building? Flat bottom, three pointer, tunnel, hydro, stepped?

What materials are you interested in using? Wood, foam, plastic, metal?

Lots of questions to answer your question.:D

I'd start with a foam or wood flat bottom. They are easy to build and a lot of fun to drive.

I use a loose formula to determine the size of a flat bottom hull. Based on the specs for the OS .75 AX, the largest prop you would run would be 15". Based on that I would make a hull 18" wide by 32"- 36" long by 2 1/2" deep.
Make the rake start about 1/3 of the length from the bow.
Shoot for a balance point about 1/3 of the length from the stern.

I'm sure others will chime in as well.

The most important thing is to be safe.
The second most important thing is to post pics and vids.;):D

flytahoe43 02-15-2008 12:25 PM

RE: motor size?
 
Alright thanx for the insight! Im not sure which type im interested in. I think I want to build with balsa. Ive been seeing that some guys build balsa, enforce with ply, and than fiber glass it. Is this a proper tech? Or is the foam core idea better?
Also, could I do a foam core with a balsa shell, and then glass it? Or is that TOO much?

Im stoked! Ive been flying planes for years, but I think this has grasped my attention pretty tight!

Thanx ahead of time for the knowledge boys!
steve

D Bronk 02-16-2008 11:22 AM

RE: motor size?
 


ORIGINAL: flytahoe43

Alright thanx for the insight! Im not sure which type im interested in. I think I want to build with balsa. Ive been seeing that some guys build balsa, enforce with ply, and than fiber glass it. Is this a proper tech? Or is the foam core idea better?
Also, could I do a foam core with a balsa shell, and then glass it? Or is that TOO much?

Im stoked! Ive been flying planes for years, but I think this has grasped my attention pretty tight!

Thanx ahead of time for the knowledge boys!
steve
Yes..Think,, "Foam Core Wings"

jasperrc 02-17-2008 08:36 PM

RE: motor size?
 
Foam core with balsa sounds good. I'd say epoxy without glass cloth would be fine.

Keep us posted on your progress.:D

flytahoe43 02-18-2008 01:17 AM

RE: motor size?
 
so just sheet with balsa, and then just layer on the epoxy?

jasperrc 02-19-2008 12:00 AM

RE: motor size?
 
Yep. Epoxy will add strength. Glass will add more strength but more weight too. Although with that size motor, you might want to consider thin ply rather than balsa. There's a lot of power in that .75.:D

flytahoe43 02-20-2008 08:44 PM

RE: motor size?
 
alrighty then! Ill get to work.




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