Im here trying to design a high endurance UAV (24 hour missions) and would like to hear the communities suggestions/comments on my design. Its been a very long time since I have designed an airframe like this one, so please bear with me.
Currently I plan to be using dual weed eater engines. I am debating between using dual Honda GX35, or dual Honda GX50.
The engines (dual GX35 dry) weigh at 15.2LB, the electronics should weigh about 5LB, and I intend to have as much fuel as I can carry. To reach my goal of 24 hours with these engines, I need to carry 6 gallons of fuel (witch weighs 36LB).
Each engine (gx35) produces 1.0 kW @ 7,000 rpm.
I havent done too much calculations, but does anyone here have any ideas?
Does anyone think this is possible? Local aviation thinks im crazy.
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That point I understand completely, and my thoughts when it comes to "easier" is if you didn't work hard for it, its not going to work hard for you.
My construction abilities are not in question, as I have constructed airframes before, but I have never designed them. If your familiar with how commercial production works, the production and design worlds are universes apart.
What would be the disadvantages of flying this with a low WCL and a loading of 16oz per ft2?
By the way, thanks martin, you have been a big help on this.
I'm not really sure about handling and other characteristics. If there are any disadvantages I guess you'll have to find them out by yourself.
Well, that settles that. First up, a scale model for tunnel testing and planning, then the real deal.
First thoughts on the process, I am going to have 3 engine mounting points, and build the largest internal tanks I can. If I can work with the one center mounted engine, great. If not, two below the wing, and if all else goes bad, nothing beats three 20x8 props.
If it is possible, I am going to build two mounting points on the fuse for external equipment or fuel.
I will post as much details as I can when I start building.
Let me get this straight... you want to mount 3 engines on the plane?
External equipment? Just make the fuse large enough that you can mount your equipment inside the fuse.
Lol, that didnt come out right. Im saying that I am going to make it as modular as possible.
I plan to have one engine, but if needed, I can switch to two or three. With the hard points, they are just in case.
its just one of those things you never plan to use, but you have if you need it.
BTW, I cant reply to your comments... were too deep in replies...