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Old May 31, 2012, 01:06 PM
less is more
Knoll53's Avatar
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TRP: Cool !

Be sure to start a build log, preferrably here in the Nurflugel forum. We'd all like to see it.

If you are really looking for a laser cutter, I like FoxLite. Contact Gary there at gary@foxlite.com

Kent
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Old Jun 03, 2012, 12:32 PM
TRP
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The plans arrived yesterday. They look good, but the AMA sent me the wrong 'build article'. They sent me build article 815. These plans are 814-1. Oops. I'll contact them on Monday and see if I can get a new article sent out.

Kent, Thanks for the info. I'm in contact with a laser cutter (cpdude) to see what sort of cost we'd be looking at.

A lifetime ago I started to do a scratch built 110" - XB-49, but ran out of steam on it.I was going to sheet it with balsa and polyspan. I was pretty new to the hobby and many people told me that nothing would stick to the foam cores I had cut and that I should have gone with a different type of foam. I tried applying the covering directly to the foam and it came out okay, but it wasn't what I had in mind. I also wasn't happy with how the motor was mounted. It took a roll of solder on the nose too keep the model from tipping back on it's tails. These two items pretty much killed my momentum on the project. I really like that Brian came up with for his Horten models. This may revive the project in one form or another.
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Old Jun 04, 2012, 02:36 PM
TRP
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By the time you read this, the scanned version of the plans will already be in the hands of a skilled and qualified balsa burner. We'll see what he says.

I was looking at the 110" one yesterday. Anyone know anything about EPP foam? I'd like to figure out if I can scrap the monokote covering and adhere some contest grade balsa skins to the big one. A while back I was told I'd have a hard time getting wood to stick to it. From what I read at the time I should have been okay. Anyone have any experience?

Feel free to PM me off thread, as I don't want to side track Bear's thread.

Thanks!
Ted
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Old Jun 05, 2012, 04:35 PM
TRP
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Pretty quiet around here.

Does anyone else have these plans? Is anyone planning on building one?

T
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Old Sep 18, 2012, 05:48 PM
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I habe built this and finished testing it today.
Have a look and tell me what you think of it.
Northrop YB-35 RC Modell Jungfernflug. (8 min 7 sec)
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Old Sep 18, 2012, 06:01 PM
Just call me crash for short
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That wing looks great in the air. Well done.

Mark
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Old Sep 19, 2012, 10:22 AM
I don't like your altitude
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Ditto what Mark said,nice job.Can you post some details please,weight cog etc.
Regards Stuart
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Old Sep 19, 2012, 11:22 AM
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Schön schön.

Jens
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Old Sep 19, 2012, 03:54 PM
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Looks really nice. Coordinated turns, no wobbling. She's a smooth sailer for sure
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Old Sep 19, 2012, 04:39 PM
Herk
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Excellent achievement -- flying qualities appear flawless.

This may of course be the pilot as well as the aircraft.

And yes - more details please. The mechanism and programming for the controls would be most interesting.
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Old Sep 20, 2012, 07:33 PM
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Well, here is some information:
AUW is 55g.
The COG is located at 47% of the root chord, which corresponds to 7% Static Stability Margin.
The controls are based on Spektrum 7DX sender and Spektrum AR6410L receiver equipped with two additional AS2000LBB servos.
The receiver is programmed as Delta, and its servos control the right side Northrop split flap. The two external servos control the left side.
The upper split flap surfaces are controlled as delta surfaces. The lower split flap surfaces are controlled through a number of server mixes.
The counterrotating engines and propellers are from Silverlit, the toys company.
The accumulator is a ThunderPower 325mAh, 65C.
Does that help?
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Old Sep 24, 2012, 12:17 PM
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My small model (see video in the thread) has 4° at the wingtips as measured against the reference line, but the reference line is parallel to the imaginary tarmac. The root chord is 9° above that reference line. So the total twist is 13°. Ok that may be more than strictly required, but I want to fly this ship also Indoor, at very low speeds, and there I need very high angle of attack. It all depends on how fast you want or need your model to fly.
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Old Sep 24, 2012, 12:54 PM
I don't like your altitude
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Love to see you fly indoors!(aircraft hanger?)
Post the video when you do.
Regards Stuart
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Old Sep 26, 2012, 04:56 PM
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Well, you are perfectly right.
The airplane trimmed as you see in this video will never be able to fly in a gym.

However, flying wings are notorious for needing plenty of accurate trimming.
This is what I have been doing in the last ten days. I am not done yet, but the indoor season starts in about four weeks. Based on the progress so far, I am cautiously optimistic I will be ready by then. There is an incredible number of adjustments that I have made, and they all bring some to the desired result.

A few days ago I reached this much progress:
Northrop YB-35 - RC Model Scale 84:1 (4 min 15 sec)


Today it was already much better, but I have no video to show yet.
I will keep you guys posted.
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Old Sep 26, 2012, 05:01 PM
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By the way for those who asked: here is the Servos layout.
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