Mini air boat

[Basstronics]

Another project! Yippee!!!

Looking to build a mini air boat. I want to use my Mystery D2632 3000kv outrunner & 30A esc.

Im looking at 16" long 8" wide.

Trying to get an ideal prop size worked out so I know how to build it.

Going to work on the CAD model tonight some.

[damfurst]

I'll be interested to see how this goes. I think that you might only be able to run a 6 inch prop on your mystery motor. I have an Exceed 1800kv motor that anything over a 7" will heat the motor. I think I'm going to try and put it on the back of a extra Mini-C hull I have. Hope you post pics.

[sailr]

If it is a 26mm x 32mm outside dimensions, 3000KV, it should swing a 8 x 4.7 apc electric prop. My Storm outrunners that size but 1250KV will swing a 10 x 4.7 all day long on 3S lipo.

[Diegoboy]

For reference...

[bwells]

What about using an EDF (electric duct fan)? They are cheap and a lot safer. There was a build on here using one of these a while back.

[Chop]

For reference...

Hey! I have that boat now!!!

What about using an EDF (electric duct fan)? They are cheap and a lot safer. There was a build on here using one of these a while back.

Hey! I built that boat…
http://forums.offshoreelectrics.com/...ad.php?t=11893

[Basstronics]

I think I will stick to a prop.

10-4 on that 8" prop size. I want to order parts this weekend.

Its going to be a balsa-lite ply construction. I will end up putting a thin layer of fiberglass on the under side once I prove it in the pond.

CAD model coming soon.

[Basstronics]

I got the basic hull design done for now.

Going to order the prop adapter and a few props this weekend.

Attached is a PDF of the CAD file. Its still rough as far as the CAD goes. I have all the pieces figured out.

The boat will have a 2 degree included V- 178 degrees. There is also a 1 degree on the rear. So if you build the motor flat to the top and use the design as is, the motor will be 1 degree angle towards the sky.

Thoughts on these angles? I dont want to much lift but I would like to reduce drag- hopefully 1 degree is good enough.

[Chop]

In your section views you show the sides to be almost 90 degrees from the deck.
If you put the sides at about a 55 degree angle to the top deck the boat will slide around the corners rather that having to sharp edge to bite into it (making it more likely to tip).

[Basstronics]

Ah OK. I built this kind of like my lil swamp buggy...

I will put some angles to it tonight.

[Chop]

Ah OK.

Sorry, I'm no expert; build it the way you see fit.

I do see an obvious difference in the way the two boats (pictured in post #6) turn. The small one has straight sides and tips badly in turns; the large boat has angled sides and slides through them (the ducted fans lower C.O.G. helps with this too).

[sundog]

Yes, tipping. It would seem that 2 ducted fan units would do the same, only with a lower center of gravity. But I don't like the slow 'get up and go' in airboats. Was thinking of incorporating 2 ducted fan units on a jetboat (or a jet drive in a ducted fan boat) for quicker response.

[Basstronics]

Ok I got it done today and I got the parts printed out. Im going to start cutting wood now.

Attached is the overall then 3 sheets of 8.5" x 11" paper printouts. So if anyone else wants to build this they can.

I upgraded the wood to 3/32" Balsa. I added some 3/32" x 1/4" Balsa runners to help stiffen things up.

Will post pics later.

[Basstronics]

I just discovered the hard way that I bought 1/8" and 3/32" thick Balsa...

Dangit!

[Basstronics]

Update.

I need to build the motor structure now. Also have to figure out how I am going to do the rudder.

This is going to be a puller. Should I go with one rudder or two?