ORIGINAL: switch26
very good idea using a servo for the choke but i already have 8 servos on the plane as it is,ill be running a lithium battery pack with a regulator to drom the voltage down to 6 volts,im also going to run a lithium for the ignition and voltage regulator to drop the voltage to 5 volts, heres another cool signature i like
from the movie gingle all the way
"always keep your promisess if you want to keep your friends"
Hi Switch26
I started out flying electric park flyers 3 years ago and I have a lot of LiPo's just sitting in an ammo box, I now use LiPo's for every thing.
One cell LiPo for ignition and 2-cell LiPo regulated down to 6 volts for the receiver.
If you are not comfortable de-soldering LiPo's, so you can use one cell, you can buy one cell LiPo's here.
http://www.maxamps.com/index.php
MaxAmps sells loose one cell LiPo's from 430 mah to 5000 mah.
I have a 4200 (two 2100 in parallel) on my DL 50 ignition (See photo) and a 4000 two cell regulated on my receiver, running the electronics on my Pitts and no worries of letting them sit for a week and then going flying. LiPo's keep their charge a lot better than NiCad's or NiMH. An now for the real bonus even though they are 4000 mah both are still lighter than the 1800 to 2500 mah 4 an 5 cell NiCad or NiMH that most people use.
I have been running my DL50 on a one cell LiP0 >> 4.2 V << (2 β 2100 in parallel) from the moment I first started the engine. I have over 60 flights and no problems. The engine has never flamed out on me. I have run the ignition battery down to 3.3 V with no discernable performance issues.
I did some research on ignition voltages after I fried my Fuji ignition module when my voltage regulator shorted that was regulating a 2 cell LiPo. I decided to try the one cell LiPo and eliminating the regulator after reading the following test done by CH ignitions. The DL50 use the same ignition modules as CH Ignitions.
Bound_4_Hell
Life should NOT be a trip to the grave with the idea of arriving safely in a well preserved body,
but rather to skid in sideways, a Rum and Coke in one hand, a joint in the other,
body thoroughly used up, totally worn out and screaming
"WOO HOO what a ride".
__________________________________________________ __________________________________________________ ______
I just have done some battery drain tests.
All tests were done at 8000 RPM. .A new single cylinder, Version 2 CHXL Ignition.
7.2 Volts -725 MA
7.0 Volts -675 MA
6.0 Volts -650 MA
4.8 Volts -475 MA
3.7 Volts -375 MA
3.0 Volts 300 MA
2.5 Volts 250 -MA
2.0 Volts - 175-MA -Weak spark, Do not know if engine would run, probably not.
Under 2 volts Ignition dead. Ignition still working but Hall Effect dead. We have done test runs and the engines run fine down to 3.2 Volts. Why use any thing over 4.8 volts. Three Nickel Metal Hydride would probably be OK. 3.6 volts.
You can find the whole document here. Itβs called β STUFF WE HAVE LEARNED β From CH Ignitions.
http://www.ch-ignitions.com/tech.html#pwr