Sig Somethin' Extra Electrified
Posted: Wed Sep 03, 2014 10:21 am
Darell,
I'll share a few points to get this discussion going and assume you want to achieve similar performance to what you currently have with glow power.
1. What is the current overall weight dry?
2. What is the weight of the glow motor and tank size?
3. Will you use a battery elimination circuit (BEC)? A good UBEC is about $20 and then you can ditch the recv battery. Recommended.
4. Good sport plane performance is achieved at around 150watts per pound. So if your plane will weigh 6pds then 900w is a good target.
5. Most 900w applications that I've seen use a 5cell pack (18.5 volts).
6. So the watt (900) and volt (18.5) selections drive the amp and KV requirements. For example, 900w / 18.5v = 48.65amps. I'll assume your glow motor is turning the prop at around 10,000rpm. So 10,000rpm/18.5volts = 540.5KV. So a motor with a similar KV, able to handle 50amps continuous, 5 cel lipo, and turn the desired prop size at 10,000rpm will work.
7. I'd also recommend a 60amp esc or larger.
I'll share a few points to get this discussion going and assume you want to achieve similar performance to what you currently have with glow power.
1. What is the current overall weight dry?
2. What is the weight of the glow motor and tank size?
3. Will you use a battery elimination circuit (BEC)? A good UBEC is about $20 and then you can ditch the recv battery. Recommended.
4. Good sport plane performance is achieved at around 150watts per pound. So if your plane will weigh 6pds then 900w is a good target.
5. Most 900w applications that I've seen use a 5cell pack (18.5 volts).
6. So the watt (900) and volt (18.5) selections drive the amp and KV requirements. For example, 900w / 18.5v = 48.65amps. I'll assume your glow motor is turning the prop at around 10,000rpm. So 10,000rpm/18.5volts = 540.5KV. So a motor with a similar KV, able to handle 50amps continuous, 5 cel lipo, and turn the desired prop size at 10,000rpm will work.
7. I'd also recommend a 60amp esc or larger.