And it has an Arden glow plug in it!!! Did you use that plug to run it? Those were the first glow plugs invented by Ray Arden ( I think that was his name!!?) Most guys do not want to run theirs on a model because of the magnesium cases. They get very brittle with ageNot very common, and a collectors piece.
   Type at you later,
  Dan McEntee

   Did you happen to tach the run that you did on a test stand? I imagine that it's not a huge power house by today's standards but better than the small ignition engines of the time, maybe even the O&R engines that are larger. You want a control line design or a free flight model?  for C/L , look at any of the designs for .15 power, and build those lighter or reduced in size a bit. The Ringmaster Jr, Flite Streak Jr., SIG Akromaster, to name a few. Brodak has some smaller models in the Clown series and some older Sterling profiles also.  Some of the smaller Veco and Joe Wagner designs that are near 30" in span and could be built light might be candidates. For free flight, Midwest made an .049 powered version of the Sniffer that is a classic, cool looking old bird. Lots of old PaaLoad event models that are in that size range and sport landing gear for an R.O.G. take off would be fun also. Surf and search the Outerzone plans site for an almost endless choice in either. I don't recall any kits that were specifically for the .09 size engines, so you just have to fell your way through some of these.

   If you get to the AMA museum, you'll probably notice that the samples from the Arden line that they have may not look better than yours does. Magnesium does not age like aluminum does and gets dark. even when brand new they are kind of dull looking, not very attractive. There may have been other brands that produced engines in magnesium, but I'm not familiar with them. That makes it hard to compare them to anything else.

  Type at you later,
  Dan McEntee

My next project is for a Forster 29 I got in a junk lot. I know it will start. Lots of compression.

David: I have quite a few Arden engine but I've never seen that head configuration.

They did indeed make a number of configurations as seen in the photo.

From top left clockwise:
1) .099 with tank, spark ignition
2) .099 glow, no tank
3) .099 glow with tank
(All .099s are plain bearing)
4) .199 missing tank, spark ignition, ball bearing.
All these are magnesium but somewhere I have one cast in aluminum.

I plan to build another Wee Duper Zilch and power it with engine number 2.

Bob Z.

David - let's see some photos of your Forster 29.

They made a number of versions of it.
I can post some photos of mine if you wish.

Bob Z.

David - from what I can see, you have a very early version of the Forster 29.

The slant cut intake and tank are the indicators. Only available in spark ignition.
The second version had no tank. Both versions had teardrop shaped exhaust stack.

After that came the slanted intake - no tank, initially spark ignition and finally glow. Rectangular exhaust stack.

Finally, the front intake, both .29 and .31 - as far as I know, all glow. All with serial numbers stamped on the front of the exhaust stack.

They also made a .79 and .99, both spark.

I will post photos soon.

Bob Z.

That combination should work well.
The Forster engines were a bit down on power compared to other 29s of the same period but they're still fine engines.
See if you can find a timer and coil so that you can run it on spark ignition.
Quite reliable when properly set up and you can run it on gasoline - you'll need approximately one third the amount of fuel.
But, with spark ignition, glow fuel works just fine.

Bob Z.

I finished the forster 29 spark ignition project last weekend.  I got it running saturday on the bench.  I would post video but its too big.  Anyway, here are a couple pictures of the finished model.  I got the plans from outer zone.  The name of the plane is defender.  Its from the 40s as well so it makes the finished product somewhat period correct.  I had to make some modifications to fit the forster engine with the tank in the back and also have a place to put the battery, coil, and solid state ignition.  Looking forward to flying it.