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October 18, 2018, 13:19:24 PM

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1
Electric Flight Technical / Re: I think this outrunner will do?
« Last post by Bad Raven on Yesterday at 21:53:27 »
Just be aware that Suppo and some others usually use rotor dimensions, and Turnigy and others use exterior dimensions, so to the unwary can appear to be more powerful than they are.

My favourite motor (but not for your use) is the Suppo 2212-6, 2300kV, used on many most of my fast wings. Near 400 Watts for around a fiver and yet it lasts well!

Makes a Dr David Halko "Superfly" ballistic................   :ev
2
IC Engines / Re: What model is this 70s OS 61?
« Last post by British Victory on Yesterday at 21:43:20 »
my last w4 I got down to under 4lbs, 3lb 10oz I think with an irvine 39 absolutely fantastic performance (the 39 replaced an irvine 72Q and several ounces of tail lead) I thought, if anything , it had better performance than the 72 particularly as the 72 had a 12 oz tank and the 39 got by with a slec red which is 6 ounces iirc.
Any how the os61 performed flawlessly, unlike me as I had a brain fart, didn't realise the engine cut switch on the futaba 14 sg stops the throttle servo from working,(I was using it as an idle down) so too high to land opened up and no engine, cracked the fuselage, sorted now but my red face will haunt me for a long time.
Quite pleased that I kept the os in the plane but I now have plans to swap it for a TT 42 GP as I have one going spare and the OS can go to a new home as hot rod wot4s aren't my bag anymore.
3
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by paul w on Yesterday 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?
4
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by GP on Yesterday at 17:25:48 »
I think some of the German guys are flying the south downs this week? Looks quite good for Bopeep tomorrow.
5
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by Bob Ryan on Yesterday 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.
6
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by swarrans on Yesterday 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
7
UK Regional / Re: The South East Flyers Thread Part 3
« Last post by mick a on October 16, 2018, 14:46:18 PM »
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
8
IC Engines / Re: What model is this 70s OS 61?
« Last post by PDR on October 16, 2018, 11:49:59 AM »
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
9
IC Engines / Re: What model is this 70s OS 61?
« Last post by British Victory on October 16, 2018, 11:30:46 AM »
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.
10
IC Engines / Re: What model is this 70s OS 61?
« Last post by paulinfrance on October 16, 2018, 09:42:13 AM »
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