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Old Jan 12, 2015, 10:28 AM
Raphael is offline
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Switzerland
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Build Log
Knecht Ruprecht - flying wing by Peter Wick & me

Hey guys

I think I'm finally able to start my own build thread here about a new flying wing, designed to my specifications by "Mr. Flying Wing" Peter Wick.

It all started about 2 years ago when I finished my so far last "Fräulein Rottenmeier" (a 2.7m fully molded slope/DS-plane also from the Logo Team) and I noticed once again, that this incredible planes has 2 major flaws:

1. The wing is 1-piece, and although that's stil a manageable size, it's big
2. It has a fuselage, and I hate building fuselages

So what could be better than asking Peter to help me design a fully molded wing, of course in 2 pieces, and of course without any fuselages. A great fellow as Peter is, he not only helped, but created the whole aerodynamic side of the project for the plane from the ground up. I'm sure he will chime in and explain from his own point of view.

So we bought some Necuron, cast to size, and milled the molds negative. Me and my girlfriend (!) then spent over 200h of sanding & polishing them until they were perfect.
However, my motivation almost left me completely when I tried to join the mold-halves for the first time, only to notice that the dowel pins do not align on the 2 sides...
I think everybody can comprehend how bad I was feeling in that very moment!

The guy doing the CAD (neither me nor Peter) found the error quickly - he had realigned the pins after setting their initial position, but only on the lower halve...

So what to do? Already spent quite some money on the material and milling, and - even more valuable - a lot of time sanding & polishing, I was about to give up.

But I had the rudder-mold already lying around - it was built from milled positives. So Peter, the CAD-guy and I discussed the possibilities, and we agreed that milling the wing-molds again does not make sense. Instead, we milled positives like on the rudder I then built molds on.

So that's where I currently am with the project. As I've read the build-thread from @timbuck and his Gizmo (which is also a PW-design) I thought I also need to contribute to this small world of maniacs

So if you are interested, I will post pictures of the progress on the project. I hope that 2 months from now, the first prototype will be flying.

Oh, not to forget some data...

Wingspan: 2.2m
Area: 43.49dm2

Cheers!
Raphael
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Old Jan 12, 2015, 10:28 AM
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Pictures of finished parts

In this post, I will gradually attach pictures of finished parts and their making...
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Last edited by Raphael; Jan 12, 2015 at 12:58 PM.
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Old Jan 12, 2015, 10:30 AM
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reserved 2
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Old Jan 13, 2015, 12:39 AM
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C'mon more Energy
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Very cool.
I'll be watching with interest!
What is the intent of the model. Speed/DS/across/all round sloper? I love to look of it. Keep up the good work. Hope you sort out your alignment problem soon
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Old Jan 13, 2015, 03:02 AM
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I´ll be back
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near by Frankfurt (Germany)
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very unusual vacuum design.
do you think it works reliably?
what about nose and CG?

wbr
Juri
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Old Jan 13, 2015, 03:34 AM
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@Swoopdown: Thanks
It's an allround sloper - I wanted a plane that could easily fit everywhere when travelling since I'm prone to transporting problems with the Fräulein Rottenmeier!
It will be fast with good turning / thermal capabilities, so it should also DS adequate.
I hope Peter will chime in and tell a bit more about the aerodynamic concept.

The alignment problems are already solved (see above): we had to do the molds again from scratch! I am a perfectionist and therefore we had to start again.

@depronator: It is unusual, but I don't see why it shouldn't work (even better than usual). It's absolutely leak-free, the foil can be laid perfectly flat on top of the mold and I only need to make sure no resin is sucked into the tubes - so don't mess around with resin (I usually don't) and apply generous amounts of vacuum-fleece. Where do you see the problems?

There will be no nose, it's really only the wing and the rudder. So I have to build light in the back and heavy in the front (doesn't hurt anyway for toughness ). Peter can explain the benefits of the design better than me, but in the end it may lead to a slightly heavier, but better turning plane. It's in fact comparable to the shorter noses on DLGs these days: You could probably achieve a lower AUW with a longer nose, but it hurts launch performance.

I always build a CoG-"simulation" in Excel where I enter all the parts, weight & distribution before building, so I can calculate the impact & end weight in advance.
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Last edited by Raphael; Jan 13, 2015 at 04:08 AM.
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Old Jan 13, 2015, 04:10 AM
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I don't like your altitude
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Subbed!
Here's another noseless design
MCZ Batteriekopf, pente ouest 4°c vent 45-65km/h (1 min 8 sec)
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Old Jan 13, 2015, 05:16 AM
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C'mon more Energy
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Cool Rapheal.
Sounds like a great all rounder. My sort of ship!
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Old Jan 13, 2015, 02:38 PM
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This week I can't show many build pics as I am waxing the molds. Maybe I'll have time for a usable (=not too heavy) rudder on saturday...

@Swoopdown: I hope so! With that plane I could even visit Australia
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Last edited by Raphael; Jan 13, 2015 at 03:30 PM.
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Old Jan 13, 2015, 04:50 PM
Tail Saw is offline
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a wing is enough
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Quote:
Originally Posted by Stupot46 View Post
Here's another noseless design
And here too, a small one, ~ 36" :

Soft-DS Versuche mit dem Bow...2/3 (4 min 24 sec)


http://www.thermik-board.de/viewtopi...tart=30#p39956

I hope the other examples motivate......hopp, hopp Raphael

Regards,

Uwe.
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Old Jan 13, 2015, 05:27 PM
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I don't like your altitude
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...
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Last edited by Stupot46; Jan 15, 2015 at 03:43 PM.
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Old Jan 13, 2015, 05:30 PM
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I don't like your altitude
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Quote:
Originally Posted by Tail Saw View Post
And here too, a small one, ~ 36" :

http://vimeo.com/110052953

http://www.thermik-board.de/viewtopi...tart=30#p39956

I hope the other examples motivate......hopp, hopp Raphael

Regards,

Uwe.
17kmph wind? Who needs hills
(Btw linked your build on Nurflugal)
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Old Jan 15, 2015, 03:29 PM
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As I wrote above, this week it's waxing time
As the first rudder-molds were not perfectly straight, I have mad new ones a few weeks ago.
The molds look great now!
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Old Jan 15, 2015, 08:56 PM
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Bigger is better
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Great to see you have a new build thread Rapheal. This thing will be a great all rounder. And yes you should come to australia

Tim
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Old Jan 16, 2015, 12:44 AM
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wow! slick looking mold!
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