|Nov 24, 2012, 12:39 PM|
|Nov 24, 2012, 01:04 PM|
North vancouver, B.C. Canada
Joined Apr 2008
It's is problem because rc range could be reduced big time
It is good idea to do range tests
Wayne could explain interference much better than me as he very intelligent gentleman
|Nov 24, 2012, 01:15 PM|
I am interested in what affects have been seen.
|Nov 24, 2012, 01:23 PM|
For anyone who likes the DSM2 Spektrum, AMain has a hell of a price on the 9 channel power balance RX
I am thinking hard about this one.
|Nov 24, 2012, 06:52 PM|
I would not expect these cameras to interfere with an RX. It could not hurt to do a range check as with any electronics you put on board. I did a little research and dd not see any reports of interference with an RX. If there is any interference, especially to 2.4 systems, it should be very low power and have minimal effect. That said, a range check can't hurt.
|Nov 24, 2012, 09:07 PM|
Well, I got my parts for the electric conversion for my 60. I'm gonna order another prop to try. With the 16x8 I'm getting 940 watts at 39 amps. The motor is rated for 1600 watts with a 3s-8s lipo range. 6s is all that will fit in the 60. So I'm gonna try a 17x8 and see what I get then.
|Nov 24, 2012, 09:26 PM|
3S - 11.1 - 610W
4S - 14.8 - 814W
5S - 18.5 - 1017W
6S - 22.2 - 1221W
7S - 25.9 - 1424W
8S - 29.6 - 1628W
If power is constant the current has to get unrealistically high. Assuming a 1600W constant power, then:
3S - 11.1 - 144A
4S - 14.8 - 108A
5S - 18.5 - 86.5A
6S - 22.2 - 72A
7S - 25.9 - 61.8A
8S - 29.6 - 54A
The motor windings for 144A would be a much bigger size compared to the windings for 54A.
Anyway, you have to observe the current limits for the motor which is a limiting factor to the amount of power that can be developed at a given voltage.
Otherwise, the magic smoke is released.
|Nov 24, 2012, 09:44 PM|
Here are the specs.
Motor KV (rpm/v)
Idle Current (A)
Net Weight (G)
Outside Diameter (mm)
Shaft Diameter (mm)
Thanks Wayne. I do have a 90A ESC in the equation too. What do you think? What formulas do I need to use when figuring these things out?
|Nov 24, 2012, 09:58 PM|
We had favorable flying conditions today. I eventually made it out to the field by about 10am and a crowd had already gathered, probably in anticipation of my arrival (yea, right).
My goal was to attach a Dollar store free-flight, foam glider to the top of my Kadet, climb as high as comfortable and release it. As i began to setup, I realized the release mechanism was not there. I went with plan B and loaded two parachutes. The Saito 1.00 on the Kadet started promptly and gently growled in anticipation. After a quick check of the control surfaces, I announced take-off and rolled on to the runway.
I turned up-wind, glanced at the wind sock, one more look at the control throws, and started to increase the throttle. The tail immediately lifted from the ground and the Kadet lifted off in less than 2 feet into the 5mph breeze as the crowed gazed approvingly.
A few loops and rolls at 25% throttle and I was ready for the parachute run. I cruised up wind and then turned downwind toward the runway at 75 feet. I waited until the Kadet was just 50 feet upwind and opened the drop doors. The parachutes deployed perfectly as I watched from the corner of my eye. Both landed about 15 feet from me.
I did a little more flying, hovers, stalls, and a touch-and-goes including tail wheel only and one main wheel. The full-stop landing was picture perfect followed by an easy turn to the flight line and engine off.
I did a couple of buddy flights on an Electrostick and two coach flights no a glider. I really don't like the DX5e used with the glider.
I also made a nice flight with the Mother Ship. I explored some of the gliding characteristics and had about a 20 min. (no timer setup) flight. I was able to find some uplift and was able to fly about 10 minutes power off. That plane has some interesting potential. The landing was perfect and stopped three feet in front of me.
One of the members had a new smoke system on a 100cc YAK. I looked great. He is using Super-Dri smoke oil.
So that is all the news that is news here in the little cow pasture of Springtown, TX. Here's hoping your skies are always clear, your winds calm, and you stick never dies.
|Nov 24, 2012, 10:15 PM|
If I allow a 10% safety for the ESC, then assume that max is 10% below peak (SWAG numbers) then the motor current is ((80 *.9)*.9) or 64.8A. At 6S my power then is expected to be around 1400W.
The assumptions make this a little iffy so if you can find the real current rating for the motor, it would be better. Also, the voltages are the nominal voltages for the lipos or 3.7V/cell and not the fully charged 4.2V.cell.
Also, your motor is going to try to turn 8400 rpm at 6S. That is not a lot of RPMs but if you can get that 17x8 up to 8K static, then the thrust would be around 14 pounds and flying speed about 60mph assuming air temperature of 59F and standard air density. This is based on a Static thrust estimator program I have.
|Nov 24, 2012, 10:37 PM|
Otherwise I agree with Wayne.
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