hmm...I only had my QHOR a lil tail heavy....only a LITTLE...but....  
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 >> S.P.A.D. Aircraft - Coroplast design >> hmm...I only had my QHOR a lil tail heavy....only a LITTLE...but....
Page: [1]

Login
Message << Older Topic   Newer Topic >>
hmm...I only had my QHOR a lil tail heavy....only a LIT... - 4/3/2003 6:28:12 AM   
Wizzie



Posts: 66
Joined: 6/21/2002
From: grove city, PA,
Status: offline 		....my fuel line muffler extension came off during maiden take off and it threw off the CG so much that had an unflyable beast.
...makes you think just how much the difference the weight of the fuel makes as the tank empties.
which brings up my question....why aren't the tanks always at the cg???
...CG is 5" back from LE on the qhor right?
       Post #: 1

hmm...I only had my QHOR a lil tail heavy....only a LIT... - 4/3/2003 9:19:03 PM   
Wizzie



Posts: 66
Joined: 6/21/2002
From: grove city, PA,
Status: offline 		at 4 3/4 inches...it STILL could hardly be flown...
my motor is under the mount and it seemed the faster...the better..
any help here?

(in reply to Wizzie)
       Post #: 2

hmm...I only had my QHOR a lil tail heavy....only a LIT... - 4/3/2003 10:50:50 PM   
Tattoo



Posts: 2124
Joined: 2/10/2002
From: Wichita, KS,
Status: offline 		What are the wing dimensions? How thick is the wing? Where are the ailerons for neutral? How far back is the airfoil fold? What specs did you follow and did you change anything from them? What engine are you using?

I'm seeing that the QHOR's are either loved or hated. In other words, they fly awesome for some but something is causing them not to for some. Kraut and I are experiencing the most fun to fly airplane we've had in a long time and couldn't be happier...but something is causing some of you not to have the same experience, and we need to get to the bottom of what we are doing different. So far, as with all Spads, aileron neutral position (parallel to the fuselage) is critical. Also, I have noticed from experience (I built 4 of them so far), photos, and other's flight reports that the thicker the wing, the worse they fly and glide. If the distance from the top of the rail to the inside surface of the airfoil fold is more than 1/2" you are flirting with too sharp of an airfoil and risking airflow seperation over the top of your wing. The resulting burble of the airflow will cause lack of control, especially at lower airspeeds and will kill it's glide slope. On my latest PQHOR I have approx 3/8' gap between the rail and wing and the plane is rock solid from full speed to full hover and has a great glide. The CG was set right on the airfoil fold with a full tank. Also make sure that your coat hanger airfoil wing tip supports are only 1" and no wider.

< Message edited by Tattoo-RCU -- Apr 3 2003 5:56PM >

(in reply to Wizzie)
       Post #: 3

hmm...I only had my QHOR a lil tail heavy....only a LIT... - 4/4/2003 6:45:16 AM   
Wizzie



Posts: 66
Joined: 6/21/2002
From: grove city, PA,
Status: offline 		...thanks Tattoo for taking a few minutes to reply.

Span: 36''
Cord: 24''
Ailerons 3" tapered to 2" and level to the fuse
Gap from top of fuse to inside peak of airfoil fold 1/4"ish.
1" coathanger on tips.
TT .42 GP mounted under. Do I have too big a motor....too heavy?

When I gained some speed, I got a flew laps in to actually get a feel of the plane (my 19th BTW, I've got some experience)
I was surprised at how little the wings flexed...oh, the flexed but not as much as I had guessed....I still may put an extra fold so the top and bottom of the wing touch, ...like a folded in spar kinda...ya know????

If I can get the low speed problem figured out...I would love to build a new one with a Norvel .25....which I don't have yet. IF the muffler BOLTS on.
I have a Norvel .15 that I HATE the muffler mount. a spring clip deal....boo.
Tnkz Guyz
~Wizzie

(in reply to Wizzie)
       Post #: 4

hmm...I only had my QHOR a lil tail heavy....only a LIT... - 4/4/2003 7:27:17 AM   
Tattoo



Posts: 2124
Joined: 2/10/2002
From: Wichita, KS,
Status: offline 		With your chord at 24" your airfoil fold should be at least 6" to 6 1/2" from the leading edge, and I would balance it at the airfoil fold with a full tank.

If your ailerons are 3" tapered to 2" I'm assuming that by 24" chord you mean average chord. In other words, it's actually 24 1/2" at the root and 23 1/2" at the tips.

If your balancing it 4 3/4" to 5" from the leading edge with that
much chord...it's WAY nose heavy!

My .40 sized QHOR is powered with the same engine (TT Gp .42) and it's got an average chord of 18" with the airfoil fold at 5" from the leading edge.

From what I've read, I think what happened is that you increased the wing's chord without compensating the airfoil fold and balance location for it. The balance point should be on the fold, and the fold should be at 25-30% of your wing's average chord.

Yes...the muffler bolts on the Norvel .25

(in reply to Wizzie)
       Post #: 5

hmm...I only had my QHOR a lil tail heavy....only a LIT... - 4/4/2003 7:42:59 AM   
Wizzie



Posts: 66
Joined: 6/21/2002
From: grove city, PA,
Status: offline 		OPPS!
My bad...
The cord measurement is....

17 3/4 tips and 18 3/4 root..
I was thinking about the cut out size for the Coro...*stupid brain*

at 5 inches it was too tail heavy for sure....my Buddy thought I was TRYING to hover LOL!

anyhoo, I think I'll start fresh and do another another with a N.25

Is your prefered setup the .42 or the .25?
I would guess that Coro is better suited for the lighter weight powerplants.
~Wizzie

(in reply to Wizzie)
       Post #: 6

hmm...I only had my QHOR a lil tail heavy....only a LIT... - 4/4/2003 6:45:10 PM   
Tattoo



Posts: 2124
Joined: 2/10/2002
From: Wichita, KS,
Status: offline 		Hmmmmmmmm...with an average chord of 18 1/4" your airfoil fold should be anywhere from 4.6" to @5" from the leading edge. If your wing is an inch or less thick, and you're balanced on the fold with a full tank, and you're ailerons are parallel to the fuse...I'm at a loss as to why it doesn't fly awesome. Is there any possibility that there is upthrust in the engine?

I prefer the .25 sized shorter wingspan versions. They are much snappier and radical. My .42 powered 36" version is actually too tame and overly stable for my tastes as a "still in training but getting better" fun-fly pilot ...but I will say that the larger one does the most perfect harriers...actually makes me look good ...the smaller ones take a little more attention to power managment for that perfectly straight harrier decent.

(in reply to Wizzie)
       Post #: 7

Page:   [1]
All Forums >> RC Airplanes >> S.P.A.D. Aircraft - Coroplast design >> hmm...I only had my QHOR a lil tail heavy....only a LITTLE...but....
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

1.016RCU3