There's no airflow, and the prop isn't able to 'unload' it's power as it would be in the air. It puts more stress on the motor and will generally cause it to draw a couple more amps. I feel that it's fine to bench test motors, but not run them for long periods of time. If yours is running long enough to get hot, it's too long IMO. I normally run them long enough to get accurate readings on my watt meter and then shut it off.

Originally Posted by pdiddyg40

There's no airflow, and the prop isn't able to 'unload' it's power as it would be in the air. It puts more stress on the motor and will generally cause it to draw a couple more amps. I feel that it's fine to bench test motors, but not run them for long periods of time. If yours is running long enough to get hot, it's too long IMO. I normally run them long enough to get accurate readings on my watt meter and then shut it off.

The motor only ran for a minute or so on the bench and got hot just in that period of time.

Originally Posted by rcplanes1234

The motor only ran for a minute or so on the bench and got hot just in that period of time.

A minute can be a long time. Motors heat up fast if they're drawing too many amps.

Originally Posted by pdiddyg40

There's no airflow, and the prop isn't able to 'unload' it's power as it would be in the air. It puts more stress on the motor and will generally cause it to draw a couple more amps. I feel that it's fine to bench test motors, but not run them for long periods of time. If yours is running long enough to get hot, it's too long IMO. I normally run them long enough to get accurate readings on my watt meter and then shut it off.

I don't think that is true...

Static on ground full throttle test



In flight full throttle at a few moments


Now explain why the measured loads are greater in air...I do believe in my own logs.

Flying upwards at WOT most likely require more power than static on ground.

I can verify this by opening the logfile and see the load at a specific moment - ie when climbing vertically

Could it be greater in air because prop gets lots of air? Static test in ground is different because prop have to suck air?

Props
One guy explained to me that pusher prop is designed differently compared to normal props.
Pusher props have more thrust on end of props than normal props? Is that true? Why is that, because airflow is affected by frame and props don't get clean airflow?

Hey there's a SW V4 at my door looking for new friends !! Auuuuuuuuuuuuuu !!!

I'm probably make mine twin engine with custom motor pods on the leading edge of the wings.., less lipo to balance it, more efficient position of motors.. what do you guys think ? a Twin Sky Walker Star....

Originally Posted by zaguruinzasky

I'm probably make mine twin engine with custom motor pods on the leading edge of the wings.., less lipo to balance it, more efficient position of motors.. what do you guys think ? a Twin Sky Walker Star....

double engine, double trouble...plus wiring complications and lengthy setup on the ground before take off.
I think there is not a lot to improve on the SW. In my book, if it ain't broken, don't fix it.... and that would be in contravention with my KISS rule

that's my personal opinion...

Originally Posted by UndCon

Now explain why the measured loads are greater in air...I do believe in my own logs.

Flying upwards at WOT most likely require more power than static on ground.

I can verify this by opening the logfile and see the load at a specific moment - ie when climbing vertically

if the prop is stalled with static test it will draw less?
if the SW has not reached top speed, it is more like a static test?
try wot straight and level.

Can a use a 8x6 prop with that motor.

Im going to go to the hobbyshop and pick up a 8x6 and see what happens.

I put my SW in yesterday for it's first major. I run mine with tri- gear and a change of wind direction forced a different approach to usual. My base turn was too near and I ran out of runway so I opened up the throttle to go round and BOOOoooof. Into a 4m high earth mound. It looked lower every other time I flew over it!!

Front gear is mashed. Tail boom ripped at the fuse, pilot is feeling stupid. All fixed overnight except I have realized that the P&T and cam mount are still buried on the mound somewhere.

It seems it will be a while before I am flying with Mooses and carving through the gaps on the trees. J

^^Sorry to hear of your crash, good luck getting it back in the air!

Today was the first time I put my SW V2 up with the RVOSD Gen4 in charge. I've spent the last few days setting up the autopilot. One scary moment when I flipped the RTH switch for the first time and it took a wicked dive.... I took control over and pulled up...hard! Tested the wing strength as well, GTG.

I'm happy, I would have played with the A/P more but in my rush forgot my second battery on the charger. Also looks like it will rain for the next week, glad to get it up!

~Wingnut13

Originally Posted by Wingnut13

^^Sorry to hear of your crash, good luck getting it back in the air!

Today was the first time I put my SW V2 up with the RVOSD Gen4 in charge. I've spent the last few days setting up the autopilot. One scary moment when I flipped the RTH switch for the first time and it took a wicked dive.... I took control over and pulled up...hard! Tested the wing strength as well, GTG.

I'm happy, I would have played with the A/P more but in my rush forgot my second battery on the charger. Also looks like it will rain for the next week, glad to get it up!

~Wingnut13

My second SW is also equipped with the same OSD.... So far I am only using it as a OSD. One day I must summon the courage to enable the RTH...

Originally Posted by zaguruinzasky

I'm probably make mine twin engine with custom motor pods on the leading edge of the wings.., less lipo to balance it, more efficient position of motors.. what do you guys think ? a Twin Sky Walker Star....

I remember you had mentioned doing this once before about 2000 replies ago. That would be an awesome build design if you can get the physics just right.

What kind of motors would you use? How would you mount them? I would really like to see the finished product.


Good luck! Keep us updated!