RE: Andy Sheber's Pitts ARF by RC Guys  
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All Forums >> RC Airplanes >> Giant Scale Aircraft - General >> RE: Andy Sheber's Pitts ARF by RC Guys
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RE: Andy Sheber's Pitts ARF by RC Guys - 5/5/2007 10:58:18 PM   
reefHawg



Posts: 68
Joined: 4/29/2005
From: Ottawa, ON, CANADA
Status: offline 		Not much of a video. Just a quick look at a vertical climb.
http://www.rcuvideos.com/item/7XMS7TKXB9Q0314X

geoff

(in reply to wind junkie)
       Post #: 76

RE: Andy Sheber's Pitts ARF by RC Guys - 5/6/2007 6:17:04 AM   
wind junkie



Posts: 981
Joined: 11/16/2002
From: N. Syracuse, NY, USA
Status: offline 		I think your cameraman ran out of air on that one!

(I heard a gasp in there somewhere...)

_____________________________

Arguing with an engineer is like wrestling a pig. Everyone gets dirty and the pig likes it.

(in reply to reefHawg)
       Post #: 77

RE: Andy Sheber's Pitts ARF by RC Guys - 5/9/2007 3:56:23 AM   
PPCFlyer


 

Posts: 51
Joined: 1/10/2007
From: Walker, LA, USA
Status: offline 		I downloaded the manual and was surprised at the elevator setup. How is the balance with this setup? I have a new YS 1.40 Sport (18-19lbs. of thrust) looking for a new home and this is one of the possible planes. I think if I could get it to come in at no more than 13lbs. it would fly pretty good...

Kendall

(in reply to wind junkie)
       Post #: 78

RE: Andy Sheber's Pitts ARF by RC Guys - 5/9/2007 11:57:00 AM   
jtsails


 

Posts: 146
Joined: 5/18/2005
From: fayetteville, NC, USA
Status: offline 		Kendall,
I would think the balance would be fine with that motor and the servos in the stock positions. I have a Saito 300 twin on mine. I put 3 servos in the tail and it balanced out with no added weight. Did have to move everything as far back as possible in the fuse opening though. I also wanted to have dual elevator servos for the strength, little concerned about the single servo, pushrod, and joiner setup with the big engine.
James

(in reply to PPCFlyer)
       Post #: 79

RE: Andy Sheber's Pitts ARF by RC Guys - 5/26/2007 12:35:41 AM   
jtsails


 

Posts: 146
Joined: 5/18/2005
From: fayetteville, NC, USA
Status: offline 		Okay Guys,
Just came back from a great day of flying and I wanted to post an update.
I went down to Joe Nall last weekend and was surprised to see Dan Spears from RC Guys with a booth. Spent some time talking with him and he was surprised that my Pitts was climbing so much with throttle. He suggested that I check the incidences again. So, when I got back home I put the plane together and carefully checked all of the incidences and the lower wing had about 2 degrees of negative incidence. The tail was at zero and the upper wing was at zero. When I put built the plane the wing fit the saddle great but the dowels didn't match the holes in the former, so I moved the holes. Now I went back to the original hole locations and reshaped the saddle to get the wing back to a zero incidence. Flew the plane for the first time today and the climbing problem is gone completely. The plane is much easier to fly smoothly, uplines and downlines are straighter. I also took a good bit of throw out of the rudder, just didn't need it, and added more throw to the elevator. I didn't measure yet but I will tomorrow. I had so much fun with the plane today that I ran a whole gallon of fuel thru it.
James

(in reply to jtsails)
       Post #: 80

RE: Andy Sheber's Pitts ARF by RC Guys - 5/28/2007 5:31:01 AM   
wind junkie



Posts: 981
Joined: 11/16/2002
From: N. Syracuse, NY, USA
Status: offline 		Thanks for the update James. When I get back in town the Pitts is goiing to be the first plane back on the bench and I'll definitely check the wing incidences.

Joe

_____________________________

Arguing with an engineer is like wrestling a pig. Everyone gets dirty and the pig likes it.

(in reply to jtsails)
       Post #: 81

RE: Andy Sheber's Pitts ARF by RC Guys - 6/6/2007 3:25:45 AM   
reefHawg



Posts: 68
Joined: 4/29/2005
From: Ottawa, ON, CANADA
Status: offline 		Ok James, finally got the wing incidence meter from a friend ( I could have done it with a level and a ruler but the laser is more fun) and measured. Remember, I believe my engine down thrust to be correct and I am experiencing the pitch up problem on the plane.
So, in reference to the tail stab,.. top wing is 0 and the bottom wing was negative by about .6 which if I move the meter to correct to 0 is about 1/4 inch! Sounds like the same situation as you. So to test this instead of raising the leading edge of the bottom wing I will lower the tailing edge with a shim. If it corrects my problems I'll go for the saddle adjustment.

BTW: if you do a search in the forums on "incidence" you'll get a bunch of hits which explain allot about how biplanes and incidence operate. All new to me.

I'll fly this Friday evening and hopefully a bunch more on Sat.. Since I am organizing our club giant scale event on Saturday, it'd be nice if I can do some flying too.

cheers,
geoff

(in reply to wind junkie)
       Post #: 82

RE: Andy Sheber's Pitts ARF by RC Guys - 6/12/2007 2:51:31 PM   
reefHawg



Posts: 68
Joined: 4/29/2005
From: Ottawa, ON, CANADA
Status: offline 		It works!! Increasing the bottom wing incidence reduces the planes pitching up problem. I still need to increase the incidence a bit more but by testing with some stacked 1/16 balsa sheet shims at the back of the bottom wing I can say for sure this is the correct action.
Not that I doubted you James, but I did have a hard time getting my head around that fix. So for now the shims will stay until I get time to make a more permanent fix on the bench.
Cheers,
geoff

(in reply to reefHawg)
       Post #: 83

RE: Andy Sheber's Pitts ARF by RC Guys - 6/14/2007 4:10:00 PM   
jtsails


 

Posts: 146
Joined: 5/18/2005
From: fayetteville, NC, USA
Status: offline 		Sounds like they my have had a problem with the building jig and they all came out with this problem.
Also, the gear mount is tough in this plane, but not indestructable. I hit a hole in the runway last weekend and flipped the plane over on a landing. It busted the gear loose but not out of the plane. No damage other than the mount itself. I'll go into this weekend and repair it.
James

(in reply to reefHawg)
       Post #: 84

RE: Andy Sheber's Pitts ARF by RC Guys - 6/19/2007 5:46:48 PM   
reefHawg



Posts: 68
Joined: 4/29/2005
From: Ottawa, ON, CANADA
Status: offline 		So, anyone else flown this plane yet? Would like to hear more flight reports.
geoff

(in reply to jtsails)
       Post #: 85

RE: Andy Sheber's Pitts ARF by RC Guys - 7/6/2007 2:13:24 AM   
CaptRKO


 

Posts: 79
Joined: 10/7/2003
From: Orlando, FL, USA
Status: offline
Glad I stumbled upon this thread...

I have the kit sitting in my spare bedroom, got it a a swap shop for $100! I am not a builder at all...so If someone is in the local Central Florida area and wants to built one for me lets talk, I will give them a few rides in my Full Scale Pitts Special in trade.....

Or--I can just bite the bullet and start "building" myslef. I guess I will need to learn to do it someday anyway.

Thinking about a Fuji 50 gas motor.

cheers!

Randy

(in reply to reefHawg)
       Post #: 86

RE: Andy Sheber's Pitts ARF by RC Guys - 8/8/2007 12:10:16 AM   
Chad H


 

Posts: 20
Joined: 6/4/2007
From: Ancaster, ON, CANADA
Status: offline 		removed...Chad.

< Message edited by Chad H -- 8/8/2007 12:11:50 AM >

(in reply to thermal)
       Post #: 87

RE: Andy Sheber's Pitts ARF by RC Guys - 8/14/2007 4:23:36 PM   
Berwyn Bill



Posts: 167
Joined: 7/19/2004
From: Berwyn, IL, USA
Status: offline 		Great thread on the Pitts!!

What's the take-off and landing distance like? Does the Pitts slow down well (I'm figuring yes with that wing loading!!)?

James, could you post a pic of your tail mounted servos? WJ's picks are great but I'd just like to see the set-up on the ARF.

Bill

(WJ, still loving my Stingray!! )

< Message edited by Berwyn Bill -- 8/14/2007 4:42:26 PM >

(in reply to Chad H)
       Post #: 88

RE: Andy Sheber's Pitts ARF by RC Guys - 8/14/2007 10:58:40 PM   
wind junkie



Posts: 981
Joined: 11/16/2002
From: N. Syracuse, NY, USA
Status: offline 		Glad to hear that Bill. Wish I had enough time to finish my Pitts. Don't think I'll get it done in time for Nashbro.

_____________________________

Arguing with an engineer is like wrestling a pig. Everyone gets dirty and the pig likes it.

(in reply to Berwyn Bill)
       Post #: 89

RE: Andy Sheber's Pitts ARF by RC Guys - 8/15/2007 1:06:39 AM   
Berwyn Bill



Posts: 167
Joined: 7/19/2004
From: Berwyn, IL, USA
Status: offline
quote:

ORIGINAL: wind junkie

Glad to hear that Bill. Wish I had enough time to finish my Pitts. Don't think I'll get it done in time for Nashbro.


At least you'll get to go to NashBro. I've gotta work! that's show biz...

I've gotten a good deal on one of these and don't think I can pass it up. I love the pitts series and the fact that this one seems to fly well just seals it. Who knows when I'll be able to get it done but with the great choices of light 45-50cc motors out there, it will be a great showplane. Set it up for smoke and do some sky writing!!!

(in reply to wind junkie)
       Post #: 90

RE: Andy Sheber's Pitts ARF by RC Guys - 8/16/2007 2:08:20 AM   
jtsails


 

Posts: 146
Joined: 5/18/2005
From: fayetteville, NC, USA
Status: offline