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October 17, 2018, 19:44:36 PM

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1
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by paul w on Today at 18:36:35 »
I think some of the German guys are flying the south downs this week? Looks quite good for Bopeep tomorrow.

Yes and yes..... see you there Gary?
2
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by GP on Today at 17:25:48 »
I think some of the German guys are flying the south downs this week? Looks quite good for Bopeep tomorrow.
3
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by Bob Ryan on Today at 13:24:30 »
Personally I set up the Break or Butterfly with about 20% lost motion at the top of the stick movement. This insurers that I donít inadvertently add a little bit of break during normal flight. The movement is fully proportional after the lost motion, so I can adjust the input on approach. It works for me.
4
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by swarrans on Today at 07:31:55 »
Personally I use the whole stick movement Mick.  I think you very quickly get used to holding the stick up when you don't want the brakes deployed - although as a power flyer you may not find that so natural and so adding a disabling digital switch may work for you.

Simon
5
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by mick a on Yesterday at 14:46:18 »
just to pick your brain gents
when i put the air brakes on the throttle stick , should i have the brakes coming up from 1/2 throttle or from the stick all the way to the top , hope this makes sense
thanks
mick
6
IC Engines / Re: What model is this 70s OS 61?
« Last post by PDR on Yesterday at 11:49:59 »
My original (plan-built) Wot4 Mk1 had a Merco 61mk3, weighed 4lbs2oz and had trouble landing because the motor idel was too fast and gave enough residual thrust to maintain height(!).

My second was a kit-built Wot4 Mk2 from the first batch of kits, with a Webra Champion (slower tickover) and weighed 4lb4oz. This would hand-launch vertically by just releasing it.

My 3rd one also had a Webra Champion, but it weighed 5lbs1oz because it had a set of retracts in the top of the wing for inverted landings.

My 4th Wot4 was also a kit-built Mk2, but lightened a little and powered by a 1st-gen (non-surpass) OS 40 4-stroke. It weighed ~3-1/2lbs and while it lacked full vertical capability it was a really delightful machine to fly.

People talked about getting their Wot4s "down to 5lbs" but I just couldn't understand how they built them that heavy!

PDR
7
IC Engines / Re: What model is this 70s OS 61?
« Last post by British Victory on Yesterday at 11:30:46 »
PDR, thanks for that info re increasing combustion space(!) Shims of the correct type are like rocking horse poo so I got my trusty calculator out and worked out how thick should a plug sealing washer be to achieve the same increase in volume as a 5 thou shim, it worked out at 1.5 mm ish.
An off cut of 8mm od copper pipe, a 6mm dowel and a bit of practice with a micro tube cutter and I managed to cut one off at about 0.057" (I only have imperial mikes).
Annealed it and formed it round a 6mm drill to get it as nearly round as possible and on it went.
I was a little bit concerned that the plug element would be shrouded but it seems to run and throttle ok on 15% nitro, of necessity short runs as it's v. noisy so I'll try it this afternoon at the field, if it's good I'll fly it as that's the only way to tell.
Don't have a battery for my tacho but it doesn't get too hot with a bolly clubman 12.5x6 on the front.
TBH I think it massively overpowers the wot 4 as it's the early narrow chord version and it weighs 2.6Kg which is .6 of a Kg too much imho, previous owner said it had unlimited vertical with a graupner grey 11x7 so we'll see.
The paint has dissolved off the fuselage, wings and tail feathers in way of the exhaust stream so it's possible that he was using high nitro anyway, didn't think to ask when I called in to pick it up.
8
IC Engines / Re: What model is this 70s OS 61?
« Last post by paulinfrance on Yesterday at 09:42:13 »
9
IC Engines / Re: What model is this 70s OS 61?
« Last post by paulinfrance on Yesterday at 07:34:54 »
I had a preference in my guided missiles of the Webra on a tuned pipe and a silly little prop ( 11 x 7 ? )
 The OS engines were really good in Helicopters, ( it was OS or Rossi ) the carburettor arm was longer on a bearing ( I my memory is ok )and it had an extended crankshaft for Hiem and Vario  mechanics for the clutch.

 I still have an aero one, on loan to a friend still running well.
10
IC Engines / Re: What model is this 70s OS 61?
« Last post by paulinfrance on Yesterday at 07:33:21 »
I had a preference in my guided missiles of the Webra on a tuned pipe and a silly little prop ( 11 x 7 ? )
 The OS engines were really good in Helicopters, ( it was OS or Rossi ) the carburettor arm was longer on a bearing ( I my memory is ok )and it had an extended crankshaft for Hiem and Vario  mechanics for the clutch.
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