Any Technical Types Around Here ?  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> RC Airplanes >> 3D Flying! >> Any Technical Types Around Here ?
Page: [1]

Login
Message << Older Topic   Newer Topic >>
Any Technical Types Around Here ? - 2/23/2002 4:16:32 AM   
DESERT RATT



Posts: 348
Joined: 2/12/2002
From: TOPAZ LAKE, NV, USA
Status: offline 		The HANGER NINE 540 EDGES that I've seen fly are very "SNAPPY" on landing! You have to carry lots of throttle.

Both of my friends have torn "ripped" the landing gear off of them because they "STALLED" coming in too slow.

They seem to be tip stalling by dropping the right wing,

If you were to put a little RIGHT THRUST in the engine, WOULD THAT HELP?

BOTH OF THE EDGES THAT MY FRIENDS FLY ARE PROBABLY HEAVY DUE TO ENGINES. (BRISON 3.2 AND A MOKI 210)

I even know that doesn't help any.

On THE OTHER HAND, One of my other friends, flies a AIRWILD 540. much more wing area,much more gentle. (also with a BRISON ENGINE)

Any ideas?

THANKS,
And yes I'm full of lots of questions!

RON in NEVADA
       Post #: 1

Tip stalls on landing - 2/23/2002 4:45:28 AM   
CurtD



Posts: 299
Joined: 12/17/2001
From: Dallas, GA,
Status: offline 		There are number of possibilities here but generally snaps (or tip stalls) on landing are the result of high wing loadings, highly tapered wings, warped wing, or rearward CG. This leaves a few alternatives. Obviously you can't increase the wing area but you can reduce weight wherever possible to improve wing loading. Moving the CG forward will also reduce snapping tendency at low speeds but may reduce maneuverability for the "wilder" maneuvers.

Your friend may be able to move his CG forward a little and increase his throws to compensate. that's what I had to do to my MW Cap232 to get it controllable at low speeds. I also use dual-rates AND plenty of exponential so that I can still slam the sticks to get snappy maneuvers but around neutral the controls are soft. Landings are now a breeze with no tendency to snap.

Another trick I've seen but haven't tried is to use the "flap" TX switch in reverse to flip the ailerons UP somewhat for landing. This has the effect of "washing out" the wingtips making them less likely to stall before the main part of the wing does. This does require mixing in some pitch trim to keep the nose from rising suddenly when it's applied.

Hope this helps some.

(in reply to DESERT RATT)
       Post #: 2

Wing loading - 2/23/2002 8:46:19 AM   
EJB


 

Posts: 336
Joined: 12/17/2001
From: NW Indiana
Status: offline 		A club member at our field has the H9 Edge with a Saito 180(33oz.) & has no problem landing.It can crawl in nose high. Both the Brison 3.2 & Moki 2.1 are over 4lb....which makes the wing loading way too high. 4 lb. on the nose of a 120 size plane makes it nice flying brick.The Brison & Moki belong on 80",15-18lb. planes.

(in reply to DESERT RATT)
       Post #: 3

Any Technical Types Around Here ? - 2/23/2002 9:58:55 AM   
daren


 

Posts: 232
Joined: 2/9/2002
From: sioux falls, SD, USA
Status: offline 		I'm with ejb on this one. I have the edge with the 180 saito and it lands slower and better than a trainer 40.

(in reply to DESERT RATT)
       Post #: 4

Me three - 2/23/2002 11:49:07 PM   
3DRC



Posts: 310
Joined: 12/16/2001
From: Spanish Fort, AL, USA
Status: offline 		I too think there must be more to it. The Hangar 9 Edges that I have seen are very stable in slow flight. I would think the CG is WAY too far back or that there is a bad build issue. Maybe something off incedence. THat plane is a slow flyer and soft lander as far as I have seen.....

Bean

_____________________________

"Experience is what you get, right after you needed it"

(in reply to DESERT RATT)
       Post #: 5

Tip Stall - 2/24/2002 1:15:11 AM   
Ed_Moorman



Posts: 3704
Joined: 1/5/2002
From: Shalimar, FL, USA
Status: offline 		One solution is to use stall strips on the inboard section of your wing. These will increase the stall speed of the root area of the wing so it is slower than the tips giving you a better landing.

A friend of mine has a Hobbico (I think) Extra 300 ARF .40 size with an old OS .61FSR in it that tip stalled badly on landing. He added pieces of triangle stock about 6-8 inches long to the leading edge near the fuselage. He says it made all the difference in the world. You might try taping them on first as a test.

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

Ed Moorman, AMA 553, KD4QBM, Revver Bro #156
R/C Report Magazine, Fun Aerobatics Column

(in reply to DESERT RATT)
       Post #: 6

Any Technical Types Around Here ? - 2/27/2002 9:06:18 AM   
Tired Old Man


 

Posts: 12012
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		Check the wing tips of your edge for a possible twist. I really think the other guys are right, though. You are carrying to much weight for this airplane, with a probable rear c/g by adding aft weight to offset the engine nose weight.
If you reduce the overall weight of the plane and use a smaller engine appropriate for tat weight, you will likely see an overall increase in performance and improved landing habits.
I've flown the Lanier 25% edge with the c/g 6 inches behind the leading edge instead of the suggested 4 3/4" and the plane landed VERY slow and there was no tip stall/snap characteristics
noted. The plane was powered with an MDS 1.48 and performed exceptionally well. KEEP IT LIGHT!!

(in reply to DESERT RATT)
       Post #: 7

Page:   [1]
All Forums >> RC Airplanes >> 3D Flying! >> Any Technical Types Around Here ?
Page: [1]





Jump to:


Google 



Search | Marketplace | Event Calendar | Local Clubs | Magazine | Product Ratings | New Products | Discussion Forums

Photo Gallery | Member Video Posts | RCU Video Gallery | Instructor Search | Field|Track|Marina Search

Advertisers | Hobby Vendor Resources | Rate Manufacturers | Sign In/Sign Up

SITE MAP!   : :   FORUM RULES

© 2001 - 2007 24-7 RC, LLC, all rights reserved.

Charities we support that also need your help
Yorkie Rescue | Humane Society | ASPCA | Crohn's-Colitis America

Kaango.com Classifieds

0.657RCU4