Im building a 7 lb hanger stick.
How would i know what size engine, esc and battery to use.
What are the best eng,esc,battery and battery size to use?
IS THERE A CHART I CAN GO BY?
Totally lost
thanks
for any help!!!!!!
.

Found this

https://hackermotorusa.com/resources...ication-guide/

Below an excellent quote, a step by step instruction for motor selection.
From
brushless motors Kv? - RCG

Originally Posted by scirocco

While an absolutely critical part of the system ...
... Kv is actually the item one should choose last.

1. Decide your peak power requirement based on the weight of the model and how you want to fly it:
   Magic numbers for e-flight - WFF
2. Pick a preferred cell count (voltage) and pack capacity for how to deliver the power.
3. Pick a prop that will a) fit on the model and b) fly the model how you want - often as big as will fit is a good choice, but if high speed is the goal, a smaller diameter higher pitch prop will be more appropriate.
4. Look for a size class of motors that will handle the peak power - a very conservative guide is to allow 1 gram motor weight for every 3 watts peak power.
5. Then, look for a motor in that weight range that has the Kv to achieve the power desired with the props you can use - a calculator such as eCalc allows very quick trial and error zooming in on a decent choice. For a desired power and prop, you'd need higher Kv if using a 3 cell pack compared to a 4 cell pack. Or for a desired power and cell count, you'd need higher Kv if driving a smaller diameter high speed prop compared to a larger prop for a slow model.

The reason I suggest picking Kv last, is that prop choices have bounds - the diameter that will physically fit and the minimum size that can absorb the power you want. On the other hand, combinations of voltage and Kv are much less constrained - at least before you purchase the components.

So Kv is not a figure of merit, in that higher or lower is better, it is simply a motor characteristic that you exploit to make your power system do what you want, within the constraints you have, e.g. limited prop diameter, if it's a pusher configuration, or if you already have a bunch of 3S packs and don't want to buy more, and so on.

Minor lay-out changes by RvS

I think for average sport flying, with good vertical performance 100W/lb. For 3D applications, 150-200W/lb. Can you fly a sport aircraft on 200W/lb?? You bet! Its going to be stupidly overpowered, but its gonna be alot of fun! Can you fly a good sport plane on 80W/lb? Yeah, you will have to plan your flight, power wise.

So, if your sport airplane looks like it will be 5#, plan on power over 500W. Then you get to choose battery voltage, 3S, 4S 5 or 6S packs. Then capacities 3300mAh upto 5000mAh. The capacities are in the typical range of a 5# sport plane.

Don't waste your time guys, trolling, to justify his commercial posts, both here and on RCG
? Electric motors - RCG

Thanks for the heads-up Ron

Originally Posted by ron_van_sommeren

Don't waste your time guys, trolling, to justify his commercial posts, both here and on RCG
? Electric motors - RCG

This is unwarranted. I was making a legitimate request for help.

im done with this

Originally Posted by fryer tuck

Im building a 7 lb hanger stick.
How would i know what size engine, esc and battery to use.
What are the best eng,esc,battery and battery size to use?
IS THERE A CHART I CAN GO BY?
Totally lost
thanks
for any help!!!!!!
.

Is this the ~ 60” stick?
If so, the power system used on the 6lb 60” Extreme Flight planes should work well if not a little over powered (easy to dial back with a smaller prop or judicious use of the throttle stick). Most use a 16x7 prop with the EF planes but a 15x7 should be fine on the stick.
https://extremeflightrc.com/Extreme-...r-_p_1731.html

is the cc on a electric motor the same a the ccs on a gas engine

Originally Posted by shieper

is the cc on a electric motor the same a the ccs on a gas engine

CC statements on an electric motor are that manufactures' estimate of the equivalent power it can produce. This can vary in practice but usually is close to the gas CC if not conservative. There are also other motors produced that don't specify a CC rating that work equally well.