gooseF22
Posts: 705
Joined: 8/12/2006
From: Fort Wayne,
IN, USA
Status: offline
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quote:
ORIGINAL: iron eagel
Goose,
Your kat look awesome!!!
Sound like it is a real screamer.
The 40,000 rpm is what it is rated for in a DF unit I doubt that I will be able to swing a prop that fast. Although I have to admit a df deamon might be something cool to try.It is just a motor I have on hand, I probably would want to do a setup that was around 1KW for the deamon. Thats roughly 1.25 Hp that should be enough at least to start. lol I am thinking of going with a high voltage primary supply to keep the current down lower, the new castle creations controllers will take 50 volt input of upwards of 100 amp output. They have a 40 amp 50 volt version that I would like to try with a neu motor. Using the HS-DK-4 Developer Cell I think I can spread out the batteries in the airframe for a 6 to 8 cell setup even given the amount of room in there. The only limit would be the weight of the cells.
I am wondering about using the winglets after what Mike said, I don't intend to be doing any knife edge flight with this one...
at least not on purpose....
Don't feel bad I got my kit long before you and have not started it yet. Talk about slow!!!
OK.
6 cell A123 is good for about 14 volts loaded at 70 amps. thats about 1KW. 8 cell about 1200 w. I was able to stuff 6 in line...see my pics in the thread here. would have to use the wings for more because of the controller and the main thing is Cooling. I cut a hole in the firewall for the inlet behind the motor, and a big hole around the servos in the back, and opened up the bulkheads so air flows. it will have a small spoiler in front of the exit. But the cool part is no fuselage persay. it looks like a flying wing.
A small prop on this one is ok because it has little drag. I was using a proven system. I ran the power system 6S 2500Kv on the nitrocat before just to test it. it was delivering around 800 watts consistently when warm and midrange on batteries. with the higer voltage, it unloads superbly, but that airframe is draggy. It would scoot about 90mph. You could tell the static thrust just wasnt quite what was needed but it would still climb straight up. If I were gonna try to make a total screamer, then up the motor to a 1600 or 1900 kv motor and go 8S, but I dont know how you would get 8 btts in there, but the power difference between the two is pretty big, and wires get hot fast above 1000 watts.
when you fly electric, hammer it on the downline and level, and begin to ease off after you start your climb or you will melt things at this level. The motor loads as the plane slows, and we saw over 100 amps once and it will max out the controller and cut. for 6S I set the cut to 12 volts. For 8 S its at 12 volts but I time my flights to 6 mins and its been using about 1700, gives me a couple go arounds. thats on the nitrocat.
Im sure I could lighten it with a 30C 4000 6S lipo and it would perform well, but it heats up when I run the 4S 3000 30C, so once I get the 123s dialed in, thats that.
I dont know if I told you all that we intentionally overcharged a 3 pack in a test to over 5 volts and they got smokin hot and the shell protruded, but they stayed in tact, and the next morning they self discharged. very good battery, just a tad heavy.
ok, back to the speedys.
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Goose
Team Fromeco
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Printable Version
All Forums >> RC Airplanes >> Extreme Speed Prop Planes >> RE: (Something Fast?) Delta Build Thread 
RE: (Something Fast?) Delta Build Thread - 
GOING TO PUT THEM BETWEEN THE HACH AND THE 2ND RIB SO I CAN PUT THEM AS FAR BACK AS POSSABLE ... THE BAT. IS BLOCKING THE BACK PART OF HACH. 
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