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Author Topic: KeilKraft Lysander  (Read 4222 times)
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TheLurker
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« Reply #50 on: March 15, 2019, 09:41:06 AM »

That looks really good.
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Rhys
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« Reply #51 on: March 15, 2019, 11:27:07 PM »

Absolutely fabulous work ZK-AUD! I can just imagine a dreary, cold and drizzling night at a lonely makeshift short airstrip sporting a bare few fire pots flickering in the wind. Slowly, the low tenored bark of a Bristol Mercury breaks the night air and the landing yard is illuminated by the lights of the Westland Lysander. In short order it touches down and makes a short roll to stop. The engine cuts off and the prop makes its final attempt to grab the night air. The side door opens and out steps two men dressed in great coats and fedoras. Fade to black.  
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DavidJP
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« Reply #52 on: March 16, 2019, 04:53:49 AM »

If only it were that easy! Wink
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ZK-AUD
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« Reply #53 on: March 17, 2019, 01:50:06 AM »

Just a quick update.  Photos to follow later.  Basically finished.  Test glided last night in front of the whole FF Scale committee.  Lovely long floaty glides landing on her wheels about 8 times out of 10.  I'll also get a final weight for you.
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ZK-AUD
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« Reply #54 on: March 17, 2019, 04:47:35 AM »

Okay so pictures taken and to be uploaded tomorrow but final weight is 18g.  Don't think we'll need any ballast or if we do it may be in the tail
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Jack Plane
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« Reply #55 on: March 17, 2019, 04:57:25 AM »

Audsome!
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ZK-AUD
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« Reply #56 on: March 17, 2019, 01:27:11 PM »

As promised here are some pictures of the nearly finished article. I'll do the registration and one or 2 other little bits but that's about as much as it's getting
Attached files Thumbnail(s):
Re: KeilKraft Lysander
Re: KeilKraft Lysander
Re: KeilKraft Lysander
Re: KeilKraft Lysander
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« Reply #57 on: March 17, 2019, 02:21:27 PM »

Very nice indeed...

Andrew
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billdennis747
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« Reply #58 on: March 17, 2019, 02:22:24 PM »

Beautiful Mike. I was hoping you would tell us how you covered those spats!
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Squirrelnet
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« Reply #59 on: March 17, 2019, 02:27:53 PM »

Beautifully done Mike and impressive weight
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ZK-AUD
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« Reply #60 on: March 17, 2019, 02:39:54 PM »

Bill all I did was to slather the spat with non-shrink dope and then lay the Esaki on quite wet.  I then gently work the tissue evenly, spreading the gathers equally with both thumbs until if bends to my will and goes around the radius, which it does with patience.  You can be fairly brutal with Esaki, even when wet.  Then trimmed carefully with  new razor blade and repeated the process for the other side.  Once it's dry another coat of dope takes out any blushing if there is any.  But I'm just an amateur - if you want to see tissue bending done well,  have a look at some of Mike Kelly's posts.
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TheLurker
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« Reply #61 on: March 17, 2019, 03:05:43 PM »

But I'm just an amateur...
A finish that good on such a varied collection of awkward shapes is an interesting new definition of "amateur".  Smiley
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Don McLellan
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« Reply #62 on: March 17, 2019, 03:29:16 PM »

Outstanding!!
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abl
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« Reply #63 on: March 17, 2019, 04:53:44 PM »

Very, very impressive. I dream of a kit scale model weighing only 18 grams!
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ZK-AUD
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« Reply #64 on: March 19, 2019, 03:22:08 AM »

Well, well, well!  Lysander has flown.  Straight off the board.   As I predicted we needed a very small amount of tail weight to flatten the glide once the prop assembly was in.  Flight 1 was 400 turns and indicated a little less right rudder.  Flight 2 with the plasticene on the back and 800 turns gave a beautiful right right pattern close to 1 minute.  Floated down and landed on her wheels.   Rubber is 4 strands of 1/16 braided.  Twice the length between prop and rear peg.  This motor will take close to 1500 turns so some very long flights are in contemplation.   Clearly I will need to tone things down for indoor.   Equivalent braided motor of 2  strands of 3/32 or less will be enough.

Final flying weight including rubber, tail weight and rear peg is 23g.  1/16 washout in each wing gives wonderful stability and keeps those pointy little wingtips doing their duty.

Very happy indeed.  My verdict on the KK Lysander is that there is nothing wrong with it if built light.  No different to any of your standard YHWMs I have trimmed over the years.

Nay-sayers take note  this bogey is officially laid to rest!!  Roll on the big one.
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billdennis747
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« Reply #65 on: March 19, 2019, 03:54:25 AM »

Well done Mike. If anyone could do it, you could! I love it when accepted wisdom is proven wrong. Who knows, one day someone will get a Bristol Scout to take off outside!
Video?
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Jack Plane
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« Reply #66 on: March 19, 2019, 04:06:01 AM »

Mike, that's fantastic!

Just a question or two...  Do you always favour a right-hand circuit or is it dependant on the model in hand?  If you favour it when you can, what's the theory - fewer forces fighting one another so more efficient use of available power for duration?
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ZK-AUD
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« Reply #67 on: March 19, 2019, 04:26:17 AM »

I like right right for HWMs as it keeps the nose up in the turn for more height and a flatter turn.  Also the turn tends to tighten rather than widen as the turns run down so good for indoor.  I've found it can encourage tip stalling in low wingers though
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abl
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« Reply #68 on: March 19, 2019, 04:29:26 AM »


> Well, well, well!  Lysander has flown.  Straight off the board. ...

Excellent! Very impressed.

A.
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billdennis747
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« Reply #69 on: March 19, 2019, 04:35:34 AM »

Just stumbled across Doug McHard's build of the Keelbild Lysander in Feb 73 AM. It makes an interesting comparison - 22g and 2 strands of quarter!
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abl
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« Reply #70 on: March 19, 2019, 04:53:16 AM »

If memory serves, that was with a carved three-blade balsa propeller, which might have made a difference to the power requirement. Or it might not, I'm just speculating.

(just had a thought - would the Aeromodeller rendition of the Keelbild plan be legal for Kit Scale?)

Andy
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billdennis747
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« Reply #71 on: March 19, 2019, 05:19:26 AM »

If memory serves, that was with a carved three-blade balsa propeller, which might have made a difference to the power requirement. Or it might not, I'm just speculating.

Yes it was but I suspect it was down to rubber quality. Compare a modern wakefield which climbs almost vertically on less rubber than in the 70s, where launches were very sedate.
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Pete Fardell
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« Reply #72 on: March 19, 2019, 05:36:34 AM »

I always thought the lacklustre performances of my boyhood efforts were due to my lack of skill and too much glue etc. so it’s good to know it was all the inferior 1970s rubber’s fault!

Mike, I didn’t really like Lysanders... till now. Lovely model! I want one.
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DavidJP
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« Reply #73 on: March 19, 2019, 05:37:58 AM »

Come on - all this adulation is a bit unfounded.  I mean it is not as though this bloke has never built a model before is it.  Look at his track record - a stream of diverse models of all shapes and sizes all finished to a high standard and flying beautifully. So frankly my dears this result is no more than I expect!  But the weight..... tee hee -  a bit of a lump isn’t it?.  My Hanriot 19 (a bi plane) is coming out covered sans prop and motor at under 10gms.
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« Reply #74 on: March 19, 2019, 06:29:37 AM »

Well done Mike - the "amateur" covering one Cheesy
10g David? is that the weight of the plan? Smiley

John

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