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Old Mar 28, 2015, 12:50 PM
onboardtherc is offline
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Help!
Ritewing Zephyr Rolls Hard

Couldn't find any information on this problem so sorry if it's already been discussed or an easy fix!

I'm new to flying wings and have had the original zephyr sitting around for awhile And decided it was time to fly it. I seem to have an issue that when I pull up fairly hard or try a loop, it rolls out to one side super hard. It won't complete a tight loop without flipping out to the side. I thought it might be one of the servos not handling the load of a hard pull up so I replaced both with full size bluebird metal gear servos. It still happens. It doesn't really become a problem until I have to pull up hard in an emergency.

Not sure if this is a cg problem or what. Sorry if this is a noob question but I'm stuck scratching my head!
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Old Mar 28, 2015, 02:26 PM
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You're causing an accelerated stall. With a swept flying wing, that (or any stall) will lead to one wing stalling before the other much more readily than for a typical "conventional" design. This is discussed at great length by myself and others on this site - do a search.
You've got to "milk" it over the top of the loop gently.
This happens more readily with higher aspect ratio wings (like the one I did below).
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Old Mar 28, 2015, 03:08 PM
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Hunter H.
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Quote:
Originally Posted by nuteman View Post
You're causing an accelerated stall. With a swept flying wing, that (or any stall) will lead to one wing stalling before the other much more readily than for a typical "conventional" design. This is discussed at great length by myself and others on this site - do a search.
You've got to "milk" it over the top of the loop gently.
This happens more readily with higher aspect ratio wings (like the one I did below).
Thanks for the reply! So this can't really be avoided? I just need to ease up a bit? I'll be sure to go browse around the forums more
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Old Mar 28, 2015, 07:38 PM
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Stall speed is determined by wing loading. Pulling Gs increases the wing loading and increases the stall speed. Run 1.5x stall speed and honk back on the stick for 2 Gs and you're instantly well below stall speed. Stall speed increases as the ratio of the G forces. So a 2 G pull-out doubles your stall speed. And that's nothing. On a wing a 5 G pullout is nothing special except that it will stall a wing and spin out like you see. I'll bet your loops are at least 4G--that increases stall speed 4 times!

Solution? Keep turns relatively low bank and loops large and slow. Practice up high so you know what you can do and what you can't do. Then you have lots of altitude to recover and it becomes fun to figure out what your flight envelope is.
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Old Apr 01, 2015, 07:12 AM
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Hi,

Can you find specs on CG position and recommended control throws?

Personally I do aerobatics and CG is critical, numero uno.

Then I adjust control throws to just below where accelerated stall happens....
these are my aerobatic Mid rate settings.

I also have a switch for Low rates....rarely use these except
for low level high speed passes.

Wings are different and agree practice up high.

My Titans are more prone to stall than longer root chord Reaper
so I had to check each one up high.

The good news is once you have settings....make notes
for next wing build.



I don't fly a Ritewing so not sure about (safe, starting) control throw distances.

Have fun.
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Last edited by Number_6; Apr 01, 2015 at 05:28 PM. Reason: sp
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Old Apr 01, 2015, 08:01 AM
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+ about 20 on Number_6's post. The right amount of control surface deflection (at least until you're crazy good) and CG position on a wing are fussy things. Lots of people have been through that and Ritewing knows for sure that's critical. I'd suggest going to their website and I'll bet all the info you need is there, including advice from fellow fliers.

This is the top wing company. Believe me, they don't want you posting that their plane does freaky stuff that you can't control. They'll help you and you'll get this totally sorted out. They aren't BananaHobby, Hobby King or Nitroplanes, who once they have your money they just ignore you. These people care how your plane flies.
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Old Apr 01, 2015, 10:02 AM
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I was going to add that when I get CG and control throws
(maximum throw without high speed stall) sorted....that becomes
the "Envelope" and I learn to fly and stunt within that envelope.

I adjust rates on my short wingspan wings to match envelopes
on my other larger wings. Point being that any of my wings
from 60" to 34", have closely matched "mid rates for aerobatics",
..... and fly very similar.

Similar aerobatic 'Envelopes' yield less crashes, more confidence
and more fun.

Example: I try to have Pinata roll rate toned down to fly like
my Reaper...for my Mid rates at least....but Pinata on High rates
roll amazingly fast if you want.... at the flip of a switch.


--------Saw some videos of RiteWing TL50s doing salmons, rolling circles and
100 mph circuits..a couple years ago.

They got me interested in RC.

Can't get TL50s and previous kits. Wish we could
but at the same time...wish them well in FPV business.

CTH kits, Flying Foam kits are awesome.
Built about 18 so far. 12 still flyable. Yup
'obsessed' to paraphrase Rockin Robbins.

Just something about wings...all I really want to build
and fly.
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Last edited by Number_6; Apr 01, 2015 at 05:42 PM. Reason: edit sp
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Old Apr 01, 2015, 12:12 PM
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Quote:
Originally Posted by Number_6 View Post
CTH kits are awesome.

Just something about wings...all I really want to build
and fly.
Ditto. It's an inexplicable sickness with no cure. They aren't my exclusive RC pursuit but they are a prime obsession.
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Old Apr 03, 2015, 01:11 AM
onboardtherc is offline
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Hunter H.
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Quote:
Originally Posted by Number_6 View Post
Hi,

Can you find specs on CG position and recommended control throws?

Personally I do aerobatics and CG is critical, numero uno.
Thanks, I'll go check out the info on the zeph for the recommended cg, I have a feeling it may be to far back still....even with 2 3300 4 cells in it
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Old Apr 03, 2015, 01:14 AM
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Hunter H.
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Quote:
Originally Posted by Rockin Robbins View Post
+

This is the top wing company. Believe me, they don't want you posting that their plane does freaky stuff that you can't control. They'll help you and you'll get this totally sorted out. They aren't BananaHobby, Hobby King or Nitroplanes, who once they have your money they just ignore you. These people care how your plane flies.
I know exactly what you mean with those other companies, I havent really dealt much with ritewing but have heard only great things about it. I'll head on over there and see what I can come up with regarding the issue. Thanks a ton
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