av8tor1977

My Feedback: (6)

I'm just curious about any possible RF interference issues with the various electric smoke pumps out there. Any issues encountered? How about with 72 MHz?? Is it necessary to "break in" the brushes as was often done with brushed car motors? Dare you hook one up to your flight battery?? Any thoughts, and better, experiences would be appreciated.

Thanks,
AV8TOR

CK1

My Feedback: (60)

I've run the TME and the Sullivan on both 72Mhz and 2.4 without break in or interference . Both units were already suppressed . I did not run them off of the receiver pack .I always ran them off of the ignition pack or a dedicated pack

CK1

My Feedback: (60)

If youre havinf RF issues maybe the motor suppression has failed . You could ad capacitors at the motor can like back in the old car days . I'm not sure what size capacitors tou would use on the Sullivan motor it pretty small .

CK1

My Feedback: (60)

If youre having RF issues maybe the motor suppression has failed . You could add capacitors at the motor can like back in the old car days . I'm not sure what size capacitors you would use on the Sullivan motor it's pretty small .

av8tor1977

My Feedback: (6)

Thanks for the answers. I ask out of curiosity, plus the fact that I have a brushed speed controller lying in a drawer, and one of those 16 dollar Sullivan "Streamer" smoke oil pumps. You can see where I'm headed with that.... A lot cheaper way to set up a smoke system on another plane than my 80 dollar "Skywriter" system.

On yet another plane, I have a smoke system with a little pump I made by sawing a Walbro carb in half. Works great!

Anybody have an idea on the value of the capacitor a person should use? I imagine a range of values would work.... And it's one across the poles, and one from each pole to ground, right??

AV8TOR

CK1

My Feedback: (60)

Use Non polar disc or ceramic .1uF capacitors. 3 caps needed .Pole to pole and pole to can on both neg. and pos. posts.

CK1

My Feedback: (60)

Those smoke oil pump motors are not supressed like the smoke pumps are .

CK1

My Feedback: (60)

Those smoke oil pump motors are not supressed like the smoke pumps are be sure to do a good clean soldering job when adding the capacitors.

av8tor1977

My Feedback: (6)

OK, thanks a lot for the info! My Sullivan Skywriter doesn't say anything about breaking in the motor; only that you should be sure to run it on sufficient voltage for the first 20 minutes until the head unit itself breaks in. I think I will set it up to recirculate through a tank and break it in before I fly it. (I tend to be a bit "anal" at times.)

Thanks again,
AV8TOR

av8tor1977

My Feedback: (6)

I bet the suppression used on commercial smoke pumps is nothing more than the 3 capacitors, and the metal enclosure, but I could be wrong. At any rate, brushed motors on electric planes are "tamed" with capacitors, so I think my idea would work.

Thoughts?

AV8TOR

CK1

My Feedback: (60)

I usually run new smoke pumps for 5 minute on time intervals . Recirculating oil with large tubing for low fluid resistance. I run 5 minutes on then 10 minutes off untill I reach at least 30 minutes run time. This way the motor gets broken in without overheating it too much .

av8tor1977

My Feedback: (6)

Yep, that sounds like an excellent plan. We think a lot alike!

AV8TOR