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best gearbox available for high torque big prop Giant cargo plane

by Michael Cook
(Kent, Washington)

I am designing a heavy-lifter seaplane for use in disaster relief situations where supplies are desperately needed on devastated shorelines and long, hard runways are distant and unable to handle the volume of relief supplies.

The concept I propose is a split hull blended wing body design with six of the largest GE engines available (over 100,000 hp each.) The wingspan would be 12 ft, which is slightly less than the Hughes Spruce Goose.

The rear of the fuselage will have features of the Chance Vought 5FU VSTOL "Flying Pancake," the Boeing X-48 blended wing body, and the Russian surface effect design called "the Black Sea monster" which basically mounted a lot of engines on the top wing of a bi-plane with short wingspans on upper and lower wings.

The proof of concept model will be 1:10 scale and will probably have to weigh close to 100 lbs. I calculate the model will have to begin hydroplaning at 15 mph and may have to reach 25 mph to take off. Seaplanes typically take a lot of power to get out of the water--the Russian designs actually shut down most of their motors after takeoff.

It may be feasible to use R/C electric boat propellers to get the model up to 20 mph or so, then transition to the airplane props.

My question(s) is this: are there brushless electric motors with enough power that six of them have a hope of getting so much weight airborne? Is there a propeller available with the modern turboprop design of many smaller blades? Shorter blades means the props can spin much faster and maybe I can get by without gearboxes? check out for pix

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Wrong scale, should be 1:25
by: Michael Cook

In the above release I blew the easy part and typed that the proposed flying model scale would be 1:10. This would yield a wingspan of 30 ft, which is of course ridiculous. Meant to say 1:25 which would mean 12 ft wingspan, with outer portions of wings removable for trailer transport.

The weight will probably push 100 lbs and I am hoping to hear that there is a prayer of getting this out of the water without going to kerosene jets.

by: Anonymous

So what your saying is your designing a true scale air craft for disaster relief operations but your looking for details about powering a model scale version preferably with existing battery technology and or wondering if there are propeller innovations that can be used? Is this a correct assessment of the nature of your question?

Not that I have any answers I'm not even an RC enthusiast culturally speaking..its just when i went to your site I found concept images and descriptions of a full scale aircraft not some innovative hobbyist or drone level model design.

I went there looking for pics of what I assumed is going to be a heavy load RC disaster support aircraft/drone, which is probably a good idea in and of itself.

As a marine mechanic, here's my 2 cents... NEW
by: Nicholas

The most efficent marine propulsion system invented to date is the Arneson surface-piercing drive. In fact, it's at its most efficient when only a half an inch (in other words just the tip) of the prop is making contact with the water. I don't know whether this is plausible for your application, but I thought I'd throw it out there just in case.

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