TommyWatson

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Prop 22x10

RPM 5200

I will try a smaller prop tomorrow. I would like to get 6000+, although it sounds like a sewing machine at these revs.

Sound much better at 2500

Regards

the Wasp

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that is so friggen cool,, I want one but will never have one LOL

but I have a Super Tartan 44cc twin

Jim

TommyWatson

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Hi Jim,

It is a wonderfull engine. It starts so easy. you are actually starting a 12.5 cc engine (one cylinder) with a prop suitable for a 50cc engine.

The only trouble is that above about 2000 rpm it starts to sound like a sewing machine. It is very quiet. It is so quiet that with another model in the air, it is hard to tell if the engine is running.

So my plan is to make some "megaphone exhausts". by that i mean a tapered tube on each exhaust, opening out to about 1/2"to 5/8". It just needs a little bit more noise.

The old tiger moth will fly around (won't climb) at about 2800 rpm so it will sound OK.

It cost me A$3000 but it was worth every penny.

Here it is running

http://au.youtube.com/watch?v=0BcUvz_x8rw


Regards

the Wasp

My Feedback: (1)

yeeaa, multi cylinder 4 strokers are very cool, my friend runs his Magnum 160 twin on straight pipes, no mufflers, it sound so cool and it's not any louder than a 2st with a muffler,,

I would really like to have a 240 or 260 twin 4st for my ARF Gee Bee Y but I have other engines right now..

rainedave

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Very impressive!


How to fly a Tiger Moth:


http://www.youtube.com/watch?v=4nZoSqPmDR8

David

Radial power

Wonderful engine! I don't know how many times I've watched your video on youtube

I have an OS 5 cylinder radial (not started yet, need to build the glow driver first) and, as far as I know, all the OS multicylinder engines should be fairly close in peak power. So, looking at the propeller specs for my radial, I'd try a slightly smaller prop on your inline than a 22x10, like a 22x8 or 20x10. These seems to be, from what I've found, the largest props that these engines will take.

In any case i'm very interested to know the results of your propeller tests, so, please, go ahead

TommyWatson

My Feedback: (1)

Hi,

I use a McDaniel 4 cylinder glow driver. The Mcdaniel units work very well and they use a 4 cell battery. I have a big Lithium Ion battery and a regulator. 4 (or 5) plugs draw a lot of current. Makes starting simple, Just switch on and start.
Yes, the 22x10 was to much, I now have a 21x8 and it seems about right. I flew it today but did not have my tach with me. I will try again tomorrow.



Regards

Radial power

I already know the McDaniels glow driver, but I like to build this kind of devices myself: it's much more fun imho.
I've already built a crude unit for my Cub powered by a Saito FA-90 TS and it works very well. I plan on improving it for my radial making it able to handle a much higher current through a reduction in the on-state resistance. All will be fed by about 10 AA size nimh cells wired in parallel with 2500 mah capacity each (I use four such cells in the Cub and they work just fine).
So I know what you mean with "just switch on and start"

Radial.

Kmot

My Feedback: (24)

Tom, I have watched your video dozens of times. I really hope to see video of your Tiger Moth flying with this jewel of an engine.

TommyWatson

My Feedback: (1)

G'Day Tom,

I can't find any video of the moth in flight. I will try to get some taken and post on Youtube.

Regards