🚀 go-pugleaf

In article <726420983snz@harrier.demon.co.uk>, bob@harrier.demon.co.uk (Bob day) writes:
> In article <96095@rphroy.ph.gmr.com> pfoss@cmsa.gmr.com writes:
> 
> On the 120 four stroke I ws thinking of using one of these Perry oscillating 
> pumps.... Presumably the smoke fuel will  eventually screw up any ruber bits
> inside it, but I picked it up cheap at an auction..
> 
> cheers
> 
> bob
> 

Perry now makes the oscillating pump in 2 forms - one for glow fuel,
the other for petroleum products, including smoke goo.   Along with
these pumps, they also make check valves in both glow and gas
flavors.
-
I have one of these, and it worked extremely well on a Saito .80,
so long as I could keep the Saito running, which wasn't very long.
The only drawback to the oscillating pump for smoke fluid is that
when the engine slows down, so does the pump: at the top of a
manuever like a stall-turn, where you probably go back to idle,
the smoke stops!

I've thought about adding smoke to my pumped Surpass II 120,
by attaching this Perry pump, but then, there's no place on the
engine backplate to attach the pump mounting plate because of the
OS's fuel pump.  Drat!

One neat installation I've seen was on a larger (1/4 scale) Lazer
200 with one of the OS Gemini twins in it - he had a regular 12v
fuel pump for gasoline (like you mount on your flight box) wired
up to some sort of a small rechargable 12v battery in the plane.

The pump output went through a needle valve mounted inside the
fuse next to the pump, so he could change the amount of smoke
fluid being pumped.  This thing would put out enuf smoke so that
he could go up into a hanging torque roll, and hide the airplane!

I believe that the only 'heating' mods were that he completely
encased the stock OS mufflers in some kind of black goo that looks
like undercoating material - he said this kept the heat in the
muffler, like an insulating blanket - then he pushed brass tubing
through the black stuff parallel to the muffler.  He ran the smoke
fluid tubing to the head end of this brass tubing, then from the
other end of the brass to the muffler pressure tap.  Same setup
on both sides of the engine.  Whatever it was, it worked!

+------------------------------+------------------------------------+
|  Tom "Krash" Krueger         |    IBM Adv. Wrkstn. & Sys. Division|
|  AMA 374525                  |    Austin, Texas                   |
|  krueger@austin.ibm.com      |    "Home of the RISC System/6000"  |
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