PAW 35
 

I've had a PAW 35 Mk 2 R/C sitting around for a while, loaned it to a friend. He was using a 12" prop and didn't like the vibration too much. I ran it on the bench yesterday with a heavy Master 13*6 K series. It turned it at 6,500 with not much vibration at all. Winding back the comp resulted in very long burps :) Ran quite happily on that prop.

I'll look around for a carb with a smaller venturi or maybe try and sleeve this one down, and bolt it on the front of a big Lanzo Bomber that's been sitting idle too long.

Anyone else used these 35s much?

RE: PAW 35
 

I think mine is a Mk1-which I've had since the mid 80's. Found it hard to start-but in hindsight and with a lot more experience of large diesels since I think the PAW recommended prop sizes are a little too small. I concur absolutely with the benefits of a big heavy glass filled prop-the lighter wood or nylon ones don't have the flywheel effect and these big ones seems to benefit from plenty of flywheel effect. 13x6 even 14x6 they take in their stride. Eventually you have to decide between bhp and higher revs versus the increased efficiency and much better handling of a large prop turning at lower revs. My GB5 and Sparey 5cc both very happy on 13" and 14" fans-but these are big sideports with Mills like handling so can hardly be compared with a front rotary PAW-all mine are standard versions so I can't comment on throttling ability

RE: PAW 35
 

I am "on the fly" to work, I will write in later about my PAW 35, I LOVE IT, its better than sliced bread :D

RE: PAW 35
 

johnvb-RCU

I used to have a PAW 35DBR RC on the front of a Telemaster 40. It flew the plane but as an associate noted
there was no room for error; you had to fly the wing.

The idle was lousy, and transition was very slow, thank goodness for flaps. This was in 92-93, Paw may have done some RC homework since. As noted the happest day of my life was when I got my PAW, the second happest day was when I got rid of it. It's an odd engine, too big and too small.

HTH - Steve B.

RE: PAW 35
 

Thanks for the opinions guys.

I might even try a 14" prop, although I suspect that might be a bit manly for the 35. Starting with the 13*6 was pretty easy, but as soon as it started I had to wind the comp back about a turn to get a break in the two stroke. Also the engine might be a bit new, although I bought it 2nd hand. Something else I might try is the carb from a PAW .29 which I think has a smaller venturi.

I hear you on the idle issues you had Steve. The Bomber I'll be trying is basically a climb and glide model so I won't be doing low passes. Round here they're normally flown with open-rocker OS60FS with 15-16" props. That sort of model should help get the engine run in and my knowledge of it increased. Maybe later I'll get it into something that requires good throttling. I have other PAWs that throttle well, my single ball-race .15 in particular is a lovely engine.

RE: PAW 35
 

"My GB5 and Sparey 5cc both very happy on 13" and 14" fans-but these are big sideports with Mills like handling"

What are these engines and where do you get them? I'm interested in diesels for scale models of WWI rotary engine types. I have a PAW 40 that I've installed in a VK Nieuport. Problem is that PAWs are too darned long--they don't fit very well under the hood. I'd love to find a Mills-like large diesel.

Jim

RE: PAW 35
 

A couple of years ago I decided to get back into aeromoddeling, so I decided to visit a shop that I visited years ago........surprise surprise it was closed down but still had stock on the shelves and a telephone number in the window. It turns out the owner had died and his son was selling whatever he could, so I made him an offer of £80 (UK) for a 29 r/c and a 35 r/c, both new in the boxes, so I walked away with both of them AND 12 litres of fuel for £90 !!

The 35 is in my "Kestrel" autogyro doing storming service swinging a Graupner 12-6, throttles well, really easy to start, just 3 or 4 flicks after a carb prime, idles rock solid on Model Technics D1000 + extra 5% medicinal castor. I would have NO hesitation in buying another one. :D
The 29 is still in its box looking for a suitable home ;)

Physically they look the same, I think the 35 is an over-bored 29.

Andrew

RE: PAW 35
 

I have a .40 mounted inverted in a Sig Rascal 40. I had to remove the cylinder, (cooling fin part only) and exhaust collector ring, bolt the crankcase into the plane and then re-assemble. It turns a 12x6 three blade at 8,300 and seems to be the perfect powerplant for the Rascal. Everbody loves the neat sound of the exhaust, it has a deep authoritative sound for a .40, no whine or bark.

RE: PAW 35
 

After 40+ hours of running the exhaust oil loses its black colour and goes to a dark honey colour, wonderful stuff,

I will probably save up and buy a PAW 61 because whatever happens in life (with the exception of hard crashes) I will always have it and if needs dictate, I could sell it for at LEAST what I paid for it, diesels are an investment , PAW's more so, proudly BRITISH :)

imagine a 61? it will sound like the "commander", pity they dont do a 90.

I dont think "hot fuels" make that much difference, so I stick with D1000 + 5% extra oil, who can argue with the manufacturers?

RE: PAW 35
 

I assume the GB5 is the replica of the Burford 5cc diesel, produced by David Owen and Gordon Burford a few years back. Very nice engines if you can find one.

RE: PAW 35
 

Andrew, I have a .60 and could try a couple of props on it if you would like to know some numbers. If I can find some that still have 1/4 inch holes in them.

RE: PAW 35
 

I often use the inserts that come with many spinners to center props with oversize bores on shafts. Failing that I have a some prop nuts with a 1/4-28 internal thread and 3/8"diameter the prop slides onto. The prop needs to be bored to 3/8" but that isn't a problem witht he large props.

RE: PAW 35
 

Greg, my .60 has a 1/4x28 stud screwed into the nose of the crank, I would rather it had a center ground, rolled thread stud but it doesn't. I'll do something though.