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Old Jan 26, 2013, 04:23 PM
I don't like your altitude
Stupot46's Avatar
Joined Sep 2011
3,382 Posts
Definitely on the list!One for a nice summer day( if we get any this year)I like your trimming,clever stuff
Stuart
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Old Jan 28, 2013, 04:29 AM
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Malaysia, Selangor, Kajang
Joined Jun 2009
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Measured the left thrust today. It's about seven degrees. There is a bit of down thrust but couldn't quite measure it. It's less than a degree. I think it would be fine to start with the seven degrees left thrust and zero down thrust then trim from there.

I'll update the plans later with the left thrust figure. I consider the plan final for now since it flies so nice. I don't think I need to make the wings thinner.

Again remember, this is with a prop spinning counter clockwise. With a regular prop you should give it seven degrees of right thrust.
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Old Jan 29, 2013, 12:00 PM
yes, its a flying lamb :)
draganbt's Avatar
Bitola, Republic of Macedonia
Joined Apr 2009
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Wonderful little model, Slabethman.

How does it behave once the rubber is wound out? It's usually a pain to freewheel rubber powered flying wings and get them gliding well.
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Old Jan 29, 2013, 12:11 PM
I don't like your altitude
Stupot46's Avatar
Joined Sep 2011
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Quote:
Originally Posted by draganbt View Post
Wonderful little model, Slabethman.

How does it behave once the rubber is wound out? It's usually a pain to freewheel rubber powered flying wings and get them gliding well.
See post 58
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Old Jan 29, 2013, 11:15 PM
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Malaysia, Selangor, Kajang
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Originally Posted by draganbt View Post
Wonderful little model, Slabethman.

How does it behave once the rubber is wound out? It's usually a pain to freewheel rubber powered flying wings and get them gliding well.
As Stu mentioned, see the video.

This is primarily an indoor plane. So it doesn't have a freewheeling prop. Indoor planes are set up to land just as the rubber run out of winds. Or at least as close to it as possible. With peanuts there's always the problem of some rubber bunching up somewhere and doesn't fully unwind.

If you look at the video. When the plane starts descending it's not because it has run out of winds. Rather, it is because the remaining torque couldn't spin the prop fast enough to provide sufficient thrust for level flight.

For this plane. If it does run out of winds while still up there I suspect that it will either glide at a steep angle or spiral into a dive depending on weather the rubber bunches up in the nose or towards the tail making it nose or tail heavy.
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Old Feb 24, 2013, 04:35 PM
InceCreations
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Joined Jul 2009
744 Posts
Eye popping, nice little plane!
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Old Feb 08, 2014, 11:28 PM
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United States, NY, Fulton
Joined Sep 2013
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Originally Posted by Stupot46 View Post
Neat.Just put one inside the other and mark over.Locating plastic cups without any "ribbing" could be a problem,I'll have to see what I can find,something I could tinker with in a quiet moment.
Stuart
Someone could commission Dixie to print up plastic cups with the prop outlines done as a decoration They look quite ornamental and for some, would be practical.
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Old Dec 01, 2014, 03:33 AM
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Italy, Emilia-Romagna, Ferrara
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Originally Posted by slebetman View Post
Here's something a bit different. An indoor rubber powered wing.

I often use the online CG calculators as the starting point for designing wings. Here's a CG calculator link for the basic design parameters: http://fwcg.3dzone.dk/?wing_span=14&...ow_mac_lines=0

Based on Norm's advise I decided to start with a 5 degree twist and just build a prototype and see how it flies. I'll adjust the plans later if necessary.

Here's the "final" version of the plans for the prototype. The actual "final" plan will only be finalized once I've got it flying successfully. It's a pusher in case it's not clear from the plans.

-----
note: updated to include the latest plan.

Hi....great project. What about wing profile? which one did you use?
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Old Dec 01, 2014, 12:00 PM
less is more
Knoll53's Avatar
United States, CA, Marina
Joined Sep 2006
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Wow, just amazed at the flight in post #53. I would have never though a rubber powered model could move so fast, let alone fly outdoors at all.

Cool plane!



Kent
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Old Dec 01, 2014, 11:16 PM
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Originally Posted by Dareius View Post
Hi....great project. What about wing profile? which one did you use?
It's an eyeballed That-Looks-About-Right (tm) profile. Nothing special. It was partly designed to be easy to cut with long straight trailing edges. Technically it's a bit too thick for its size but I was worried more about structural strength than aerodynamics - especially keeping the twist once covered.
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Old Dec 01, 2014, 11:24 PM
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Originally Posted by Knoll53 View Post
Wow, just amazed at the flight in post #53. I would have never though a rubber powered model could move so fast, let alone fly outdoors at all.

Cool plane!



Kent
I think part of the apparent speed is optical illusion from being in the center of the flight circle and so close to the model. It would probably appear to fly slower if videoed from afar.
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Old Dec 02, 2014, 04:07 AM
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Quote:
Originally Posted by slebetman View Post
It's an eyeballed That-Looks-About-Right (tm) profile. Nothing special. It was partly designed to be easy to cut with long straight trailing edges. Technically it's a bit too thick for its size but I was worried more about structural strength than aerodynamics - especially keeping the twist once covered.
I read about thickness...it should be better a thinner profile. But I never heard about the profile you mentioned
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Old Dec 03, 2014, 04:21 PM
SlingWinger
San Bernardino, California, United States
Joined Oct 2004
1,708 Posts
This thread has been a fun read.

Those of us with experience in the Nurflugel area of aeronautical (mis)adventure recognize that the flying wing's apparent simplicity is instead a clever disguise.

I've been hooked on these things for quite awhile now. I am gradually coming to the conclusion that the Nurflugel's primary contribution to aeronautical science is it's effectiveness in teaching the value of an empennage.

1976: "Man, this is cool! I don't need to build a fuselage or tail!"

2014: I was given another Zagi-clone. Cut it up to remove the sweep, whipped up a not-too-crude fuselage from Coroplast and foam, made a tail the same way.

Much better now.
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Old Dec 03, 2014, 11:49 PM
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Originally Posted by dayhead View Post
1976: "Man, this is cool! I don't need to build a fuselage or tail!"
More like 1912 - http://en.wikipedia.org/wiki/Dunne_D.8

Interestingly, the first tailless plane was built not out of novelty or the desire to reduce drag (Hortens) but rather as an attempt to understand stability. The Dunne series of flying wings were promoted as automatically stable. I strongly suspect it's mainly because the twist/reflex effectively act as washout reducing or eliminating adverse yaw - something not fully understood at the time and likely a cause of lots of crashes.
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Old Dec 04, 2014, 10:40 AM
less is more
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United States, CA, Marina
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Quote:
Originally Posted by dayhead View Post
Those of us with experience in the Nurflugel area of aeronautical (mis)adventure recognize that the flying wing's apparent simplicity is instead a clever disguise.
ha, ha, ha...
yes I understand that Nurflügel is actually latin for " It's a trick...Run !"
I've always been amazed that the Horten IV was able to compete successfully in sailplane contests of the day.
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