Small, efficient quad

H

HDtallrider

Well-Known Member
Hi all! I accidentally ordered 2, 2s 5000mah batteries instead of 3s. It would cost a bunch to return them. I thought I might build a 7.4v quad and try for some really long flight times just for fun. I have been searching for a couple days and am not having much success finding motors strong enough and efficient enough to lift a quad that would probably be around 500+ grams AUW. I am completely open to any advice including frames and props as well as motors. Thanks!
 
Ok, you can buy motors designed for 2S (I am sure you already knew this) When choosing a motor for this you want to get one that has a little higher KV and the number before KV should be higher. This number is the torque, you could make a bigger quad that is fairly efficient with 2S, or just wire them in series and have a 4S 5000MaH set.
 
I have been doing some more research and the pickin's are slim! The batteries are 285 grams by themselves. The best I can come up with for a frame with everything, less batteries, is about 240 grams. I found that a RC Timer 1806 2300kv with a 7x2.0 cf prop can just about due 550 grams at 50%. The KDE 1806 2350 kv with a 8x2.4 cf prop can easily due 750 grams with a little better efficiency. The problem is the KDE is over 3 times the price! I wanted to include FPV but thats too heavy. I'll keep looking....
 
I hear ya brother! I'm gonna keep messing with the frame assembly and see where I can trim some weight. I can live with a little less strength. I want slow and easy just to see how long a flight time I can get. I don't intentionally do acrobatics. My landings just look like it...........:rolleyes:
 
Haha, I finally got landings down. To land I was slowly dropping the throttle to 0. I found that if you let it drop enough for your quad to descend and just leave it there until you touch down it is a lot better. I still have not got landings down when I have any forward momentum (I can do all kinds of rolls, flips, and cart wheels) xD.
 
Yeah. I do those too. Just not on purpose........... I will eventually get it. In the meantime I am having a blast building, tearing down and building again. Each time I read threads in the forums I learn something new. I just wish what I learn would be less expensive.:) I am going to use this little quad to experiment and hopefully save some cash. I really want to build a quad capable of FPV and near 1 hour flight times on a 10k Mah battery or less. I'm going to use this one as a scaled down version. Should be fun. When I get it fine tuned I'll scale it up. P.S. I may have some new info on the cryo stuff. I'll post it when I get it.
 
Ok, sounds great. It is a lot easier to get bigger flight times on bigger props. a 10Ah battery would give a good flight time if you could work out the best prop and motor combination. You might want to play around on this calculator a little to see the longest theoretical flight time.
 
That's what I was thinking for the big quad. For the little guy I already have the batteries. I'm gonna go for 7 or 8" props depending on if I hit the lottery and can afford the KDE motors.:) This is kind of a proof of concept . Hopefully on the cheap.
 
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