Anyone Used The Sullivan Smoke pump?

[TheSaint]

Planning to fit one to the Tiger Moth for a bit of fun.

Sullivan manual calls for 4.8 to 6.0 volt battery, my receiver uses 4.8 volt.

I plan to wire the pump power input to a wye-piece in the battery wiring, between the battery terminalls and the switch/charger jack unit.

Battery is a 1450 mAh job, so longevity should be okay.

BUT:

Anyone think it a good idea to fit a dedicated 4.8 or 6-volt battery instead? Probably be a 4.8 volt regardless as (a) I have a spare (600 mAh) and (b) I don't have a 6-volt charger.

Will the pump draw down the battery when the plane is switched off? Remember the pump is wired, in effect directly off the battery. Manual says it won't draw power unless the servo feed is positive, but I don't trust manuals and I'd like to make use of the extra battery capacity to fly the plane more times in a day, rather than have it drawn down prematurely by the pump.

So: second battery or not?

Add an extra switch or not?

[maverick06]

for the safety, yeah I would. Its not much weight.

[TheSaint]

Go figure why I did a degree in mechanical engineering and not electrical.

If I tap the wire from the main switch to the radio rather than on the battery side it can only draw current when the switch is on. If needs be I can add a second battery later (in parallel to the first) on the battery side of the switch to increase filght time.

[paulrink]

Where the best place to drill and tap a hole for the fitting that the oil comes out of on a pitts muffler?The closest to where the gases come out?