need electronic help
#1
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From: illinois
I have designed and scratch built an aircraft around the fan unit from the kyoshi T-33.
the particulars:
the d/f unit is the stock one that was in the kyoshi T-33. I can only describe it for identicication. There are two (resistors?) green w/102K marked on them. the entire unit is approx.4" and has an approx. dia. of 3". The battery-6-cell 7.2 volt 1500mah
The E.S.C and reciever are from gws. This is the equipment out of the gws zero arf, and powered by a 7-cell 8.4 volt 600mah.
My question: Can I use the d/f battery to power the esc and reciever without burning them up?
thanks to all
the particulars:
the d/f unit is the stock one that was in the kyoshi T-33. I can only describe it for identicication. There are two (resistors?) green w/102K marked on them. the entire unit is approx.4" and has an approx. dia. of 3". The battery-6-cell 7.2 volt 1500mah
The E.S.C and reciever are from gws. This is the equipment out of the gws zero arf, and powered by a 7-cell 8.4 volt 600mah.
My question: Can I use the d/f battery to power the esc and reciever without burning them up?
thanks to all
#3

Joined: Jan 2002
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From: Redwood City, CA
To power the receiver and servos from the d/f power battery, you need a speed control with BEC (Battery Eliminator Circuit). The BEC is a voltage regulator with 5 V output that is typically fed to the receiver via the throttle channel.
BECs are limited to less than 10 cells and two or three servos typically due to power dissipation. The ESC's instructions will indictate the number of cells and servos that the particular BECcan handle.
The green things are capacitors, used to reduce electrical noise from the motor. They should connect from each motor terminal to the motor's case with the shortest practical lead-length.
BECs are limited to less than 10 cells and two or three servos typically due to power dissipation. The ESC's instructions will indictate the number of cells and servos that the particular BECcan handle.
The green things are capacitors, used to reduce electrical noise from the motor. They should connect from each motor terminal to the motor's case with the shortest practical lead-length.
#4
You will need at least 35 amp but for continuous full throttle use it would be safer to go with a 40 amp unit. The Kysosho will live long on 7 or 8 cell battery packs. Thought I read somewhere on Ezone where the max amperage measured was 37 amps. Mine flew fine with the 50 amp cheapo ($49) ESC from Great Planes (Tower Hobbies). Perhaps some of the electric experts can chime in on their recommendations.
By the way, the Sanyo RC2400 packs are the recommended battery type. Stay away from the NiMH packs and Panasonics due to their higher internal resistance. You will need a battery with little internal resistance that will give the Kyosho fan unit all the energy it needs. Expect the battery to be quite warm after running so a cool down of up to 30 minutes will be required before you recharge then another cool down cycle after the charge. All in all you are looking at considerable time between flights if you only have one battery pack. You will need a good charger and plenty of the RC2400's to have continuous fun.
The 600mah 8 cell pack you have will be good for about a minute to minute and a half of full throttle use so you want something in the 2400mah or more if you can handle the extra weight.
Good Luck!
By the way, the Sanyo RC2400 packs are the recommended battery type. Stay away from the NiMH packs and Panasonics due to their higher internal resistance. You will need a battery with little internal resistance that will give the Kyosho fan unit all the energy it needs. Expect the battery to be quite warm after running so a cool down of up to 30 minutes will be required before you recharge then another cool down cycle after the charge. All in all you are looking at considerable time between flights if you only have one battery pack. You will need a good charger and plenty of the RC2400's to have continuous fun.

The 600mah 8 cell pack you have will be good for about a minute to minute and a half of full throttle use so you want something in the 2400mah or more if you can handle the extra weight.
Good Luck!





