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Author Topic: KP  (Read 1271 times)
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kpderek
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KP
« on: January 16, 2017, 06:29:16 AM »

Hello all,
Just to let you know that KP is still open and I am OK but waiting for a by-pass op. The new ø10mm motors have arrived and the small fans are now available again. Have just started a Canberra. The new email address is kpderek@btconnect.com
Thank you,
Derek Knight.
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Andrew Darby
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« Reply #1 on: January 16, 2017, 08:30:53 AM »

Hi Derek,

Nice to see you on this forum and you are OK.  Keep us in touch with your Canberra build  Smiley

Andrew
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« Reply #2 on: January 22, 2017, 06:28:36 PM »

Derek-
 Thanks for the update. Rest and take care. I'm looking forward to seeing your Canberra. Glider wings or not?
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kpderek
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« Reply #3 on: January 23, 2017, 07:29:07 AM »

The Canberra will be powered by two of my ø24mm fans and is 650mm span.
Derek.
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Sky9pilot
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« Reply #4 on: January 23, 2017, 07:47:04 PM »

Derek,
The fuselage looks fantastic!  Are you building from your own plans or another source? 
Tom
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kpderek
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« Reply #5 on: January 24, 2017, 03:20:31 AM »

The drawing is 3 x 1/72 scale from the original in the August 1953 Aeromodeller.
Derek.
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GeoffinIN
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« Reply #6 on: January 24, 2017, 08:48:34 AM »

Until now I had not realised how graceful the Canberra fuselage is.  Its wide-chord wings seem to hide it, I think.  OTOH, it makes for an ideal model for your little fans.
Do you produce the EDFs in-house, or do you have them produced to your specifications?

Beautiful work!

Geoff
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kpderek
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« Reply #7 on: January 24, 2017, 09:25:27 AM »

Hello Geoff,
I make the fan unit excepting for the ø10mm inrunner motor. Yes it is an elegant fuselage, it reminded me of the dH Comet which I worked on as an apprentice and then fitter at deHavillands years ago.
Derek.
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GeoffinIN
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« Reply #8 on: January 24, 2017, 11:48:50 AM »

Yes it is an elegant fuselage, it reminded me of the dH Comet ...
Derek.
My thoughts exactly!  Also redolent of the Sud-Est Caravelle, I think.  And one must include the Hawker Hunter in any list of elegant jets.  I've just started a Hunter, thus my recent purchase from you.

Geoff
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FFmodeller
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« Reply #9 on: January 24, 2017, 02:02:44 PM »

Great looking build Derek.
All the best for your upcoming recovery Smiley

Russ
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kpderek
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« Reply #10 on: January 24, 2017, 02:51:08 PM »

You are right about the Caravelle Geoff especially as the original ones had the Comet's nose before the French made their own. All the best with the Hunter. there are a lot of losses with the long tail pipe but they fly very well. I experimented with a cheater intake in my ø24mm fan one, I made the cheater intake underneath and got more thrust but a worse flying performance, I think the underneath intake sucked the model down more than the extra thrust helped. Thank you Russ, I am still waiting for the operation which may wreck my chances of going to the Indoor Nationals.
Derek.
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DHnut
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« Reply #11 on: January 24, 2017, 03:31:14 PM »

Wishing you all the best for the upcoming operation Derek. I plan to be in the UK in March and May and hope to see you then. Our summer has been windier than normal but we managed to get all our events flown at the Nationals.
Ricky
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kpderek
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« Reply #12 on: January 24, 2017, 03:40:50 PM »

Hello Ricky,
I hope by May that I should be OK, looking forward to seeing you.
Derek.
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GeoffinIN
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« Reply #13 on: January 24, 2017, 08:00:25 PM »

As regards long pipe losses, I hope to attenuate that as much as possible by placing the fan as far aft as balance will permit, and mold carefully contoured bifurcated inlet ducts with no upstream portion smaller in area than the downstream position, and always greater in area than the fan swept area.  A lot of work, but, according to an aero engineer of some repute over here, that's the only way to do it right.   I'll likely have slightly enlarged inlets, but I don't think it'll be so large as to compromise its appearance.  We shall see!  Having seen Marty's long-exhaust F 84 fly with authority, I know it can be done!

As with the others, best wishes WRT the surgery!

Geoff
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kpderek
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« Reply #14 on: January 25, 2017, 06:20:29 AM »

Hello Geoff,
I have tried the rear mounted fan on my AVRO 707s and found that I needed heavier gauge wires to reduce electrical power losses and I also had probably too small ESCs, although they were theoretically capable of 50% more current than the fan drew larger ones would have been better. I have attached photos of my Hunter built 3 or 4 years ago.
Derek.
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Sky9pilot
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« Reply #15 on: January 25, 2017, 05:12:28 PM »

The Hunter looks great!  Thanks for sharing it!
Tom
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« Reply #16 on: January 25, 2017, 06:45:42 PM »

Thanks, Derek!  I hope mine looks half as good!  Do you have any shots of the inlet duct setup?  And thanks for the heads up regarding long wire losses.

Geoff
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kpderek
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« Reply #17 on: January 26, 2017, 06:35:24 AM »

Hello Geoff,
The attached photo is the best that I can do. The wings are held on by tongues and boxes, I make a 1/16 box in the fuselage and wing and use a loose 1/16 tongue and a couple of magnets to hold the wing in place. The adjoining root ribs are re-enforced with 1/64 ply and have a couple of short ø1/16 location pegs. In the event of an extra heavy landing and the tongue breaks then another one can be used after the broken one is removed. On the Hunter the complete tail unit is helb on by the same method. Although this is heavier than fixed surfaces it saves a lot of repairs.
Derek.
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GeoffinIN
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« Reply #18 on: January 26, 2017, 01:46:51 PM »

That does help, thanks.

I got the new fan and timers yesterday.  VERY fast service!  Many thanks!  No I've got to "git 'er done!"

Geoff
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kpderek
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« Reply #19 on: January 26, 2017, 02:18:53 PM »

Thank you Geoff for telling me about the delivery.
Derek.
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kpaero
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« Reply #20 on: March 11, 2017, 11:33:54 AM »

Canberra Model so far, electric systems to be installed next.
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billdennis747
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« Reply #21 on: March 11, 2017, 11:52:51 AM »

You.ve been busy Derek. Looking good.
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Sky9pilot
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« Reply #22 on: March 14, 2017, 12:56:48 AM »

Looking great.  WoW when you reduce your pictures you really reduce them.  I'd love to see more and bigger for my eyes please!!!
Tom
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GeoffinIN
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« Reply #23 on: March 14, 2017, 06:00:24 PM »

Ditto what Tom said.  Beautiful from what can be seen, though.

I've got a fuselage 90% built for my enlarged Keil Kraft Hunter, but have forgotten how to post a photo here that's not too large a file.

Geoff
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kpaero
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« Reply #24 on: March 14, 2017, 07:07:42 PM »

Thanks Geoff, I used a free downloaded photo resizer, probably overdid it according to Tom.
Derek.
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