RE: Viper Pitch issue  
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All Forums >> RC Airplanes >> Pylon Universe - RC Pylon Racing >> Q-500 Racing >> RE: Viper Pitch issue Page: <<   < prev  1 2 3 4 [5]

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RE: Viper Pitch issue - 3/18/2008 6:11:01 PM   
Jim Duda



Posts: 214
Joined: 4/10/2006
From: Austin, TX, USA
Status: offline 		Mr. Karlsson - this is what USA folks call a "fuel tank"...he wants to know where in the fuselage it is located - up front next to the firewall, on the CG, or somewhere else.

Very best regards,
jimd

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(in reply to jaka)
       Post #: 101

RE: Viper Pitch issue - 3/18/2008 6:29:38 PM   
skull1971



Posts: 746
Joined: 4/24/2006
From: Willis, TX, USA
Status: offline 		Yes, Thank you Mr. Duda.
Sorry for not being clear, Jaka where is your fuel tank located in the air frame. I seem to remember some posts a few months ago that we talked about fuel systems and I think you even put up pictures. Plus yours is still one of the best looking Vipers ever.

< Message edited by skull1971 -- 3/18/2008 6:30:41 PM >

_____________________________

ERIC, Revver Bro. 159, NMPRA 59i, Knucklehead #1
What happen? The ground got in the way of the plane!

(in reply to Jim Duda)
       Post #: 102

RE: Viper Pitch issue - 3/19/2008 11:02:02 AM   
Backplate


 

Posts: 17
Joined: 1/12/2008
From: Christchurch International, NEW ZEALAND
Status: offline 		Hi Guys,
Well I have been racing Pylon here in new Zealand Approximately 10 years, give or take a couple. Any way I do not ever use EXPO on a pylon racer? The only Expo I use is on my
Right rudder, 100% Neg been Futaba set, & thats only for take off, & so when I'm flying & using the Elevater & I dont move the rudder unless I move it all the way across with the stick?
I'm sure Dubb Jett wrote a article on using Expo in Pylon Racers, ages ago. My movements on all my racers, are only 3 / 4mm & thats on Elevator & Ailerons. I land & take off with the same amount of stick, never had a problem. But I do have D/R set just in case I need more throw for some reason.

(in reply to jaka)
       Post #: 103

RE: Viper Pitch issue - 3/19/2008 5:00:27 PM   
jaka


 

Posts: 4423
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
Thank's Skull 1971!
Here's some pictures.

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_____________________________

Jan Karlsson Airracing products
MVVS, Motul "Micro" all synthetic oil

(in reply to skull1971)
       Post #: 104

RE: Viper Pitch issue - 3/19/2008 5:04:56 PM   
jaka


 

Posts: 4423
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
Agree! I never use any expo either! Just trim the plane by moving the servos,receiver or batteries (and set the elevator to minimal trow) until you get the desired flight caratheristics.

_____________________________

Jan Karlsson Airracing products
MVVS, Motul "Micro" all synthetic oil

(in reply to Backplate)
       Post #: 105

RE: Viper Pitch issue - 3/19/2008 5:20:34 PM   
skull1971



Posts: 746
Joined: 4/24/2006
From: Willis, TX, USA
Status: offline 		Jaka your Viper looks different that what we get here in the U.S. Maybe it's something you've done, or not, but the wing saddle it totally different, what does the V-tail mount look like? If it is different that might explain why you don't have to shim the tail up.

Also, might need to PM me or start another thread, tell me about Motul, got a 3w 75 to start running.

_____________________________

ERIC, Revver Bro. 159, NMPRA 59i, Knucklehead #1
What happen? The ground got in the way of the plane!

(in reply to jaka)
       Post #: 106

RE: Viper Pitch issue - 3/19/2008 5:24:14 PM   
Jim Duda



Posts: 214
Joined: 4/10/2006
From: Austin, TX, USA
Status: offline 		MY CG is 3.0 - 3-1/8 inches behind leading edge of wing. The 700 MAH 4 cell NiCd battery is as far back as I can put it in the fuse cavity. It grooves like an arrow. As you can see, the fuel tank is as far forward as it can be with the TT Pro 40.

(When converted to a Q25 using an OS 25 FX, the battery must be relocated to the front of the fuse cavity to retain the correct balance.)

Take-offs and racing are in low rate, landings are in high rate (approx twice as much throw as low rate). Expo 15% all surfaces.

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(in reply to jaka)
       Post #: 107

RE: Viper Pitch issue - 3/19/2008 6:18:34 PM   
garys


 

Posts: 740
Joined: 1/31/2002
From: San Diego, CA, USA
Status: offline 		Eric, I think Jaka's is a regular Viper. I think he just added some balsa to the inside of the fuse sides at the wing saddle and potted the wing with microballoons and epoxy.

_____________________________

GS

(in reply to Jim Duda)
       Post #: 108

RE: Viper Pitch issue - 3/19/2008 11:51:15 PM   
skull1971



Posts: 746
Joined: 4/24/2006
From: Willis, TX, USA
Status: offline 		garys, thanks, it's looks pretty cool what ever he did.

Mr Duda, with CG at 3"+ I can't see how you can even fly it!! Mine at 3" was so bad that I had to abort flights, because I couldn't hardly control it. I do know this, with you and Jason, if anybody can get a handle on'em, it'll be ya'll.

_____________________________

ERIC, Revver Bro. 159, NMPRA 59i, Knucklehead #1
What happen? The ground got in the way of the plane!

(in reply to garys)
       Post #: 109

RE: Viper Pitch issue - 3/20/2008 12:03:38 AM   
Bozarth


 

Posts: 153
Joined: 4/30/2004
From: Centennial, CO, USA
Status: offline 		It cracks me up how so many racers think they are "hot stuff" because they don't use expo. I'm still laughing! Be proud of something more important for goodness sake, like your involvement with your local schools, rescue missions, animal shelters, homeless shelters, or hospitals! You guys crack me up!

Kurt Bozarth

(in reply to skull1971)
       Post #: 110

RE: Viper Pitch issue - 3/20/2008 1:00:37 AM   
skull1971



Posts: 746
Joined: 4/24/2006
From: Willis, TX, USA
Status: offline 		Or building outhouses!!??

Read everything, and then comment, I don't remember anyone claiming to be "Hot" by not using expo. I think it has gone more, "Don't use to much or it'll cause you problems, and adjust to your taste."

Oh and at the moment I am proud, no to be dead, or in a wheel chair, and still able to fly pylon. I've had a real bad couple of weeks!

< Message edited by skull1971 -- 3/20/2008 1:03:20 AM >

_____________________________

ERIC, Revver Bro. 159, NMPRA 59i, Knucklehead #1
What happen? The ground got in the way of the plane!

(in reply to Bozarth)
       Post #: 111

RE: Viper Pitch issue - 3/20/2008 1:27:33 AM   
Bozarth


 

Posts: 153
Joined: 4/30/2004
From: Centennial, CO, USA
Status: offline 		Eric,

Right on.

Kurt

(in reply to skull1971)
       Post #: 112

RE: Viper Pitch issue - 3/20/2008 3:36:33 AM   
daven



Posts: 6764
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		Kurt,

I use very little expo, don't like it much.

5-10% max on Quickie, and 10-15% on Q40.

Doesn't have nothing to do with pride, and the only reason I use it, is to slow down the faster digital servos.

_____________________________

Dave Norman

klasskote.com
supertrc.com

(in reply to Bozarth)
       Post #: 113

RE: Viper Pitch issue - 3/20/2008 4:38:04 PM   
jaka


 

Posts: 4423
Joined: 12/11/2001
From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
My wing saddle is just built up with a piece of balsa on each side and with brown micro balloons and 24hour epoxy. It's better to have slightly larger surface for the wing to seat on than the original thin fuselage sides.


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< Message edited by jaka -- 3/20/2008 4:39:19 PM >

_____________________________

Jan Karlsson Airracing products
MVVS, Motul "Micro" all synthetic oil

(in reply to skull1971)