RE: Nitro Models Pitts-40 Special Design  
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RE: Nitro Models Pitts-40 Special Design - 2/21/2008 8:31:40 PM   
opjose



Posts: 5473
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		Remember that the tail wheel does not have to turn sharply to be effective.

The closer the wheel assembly and the rudder pin are, the more sharply the wheel will turn.

Ideally the wheel itself should be over the hinge point.





< Message edited by opjose -- 2/21/2008 8:32:39 PM >

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RE: Nitro Models Pitts-40 Special Design - 2/23/2008 2:46:08 PM   
pkevinb


 

Posts: 258
Joined: 2/23/2006
From: Meadville, PA, USA
Status: offline 		linkadrip, I installed my FA-62 sideways. It fits nice and looks good but I think inverted like yours looks slightly better. I just didn't want to have to a remote glow starter.

I am wondering where you are going to mount your on/off switch / charge jack. The only place I can see is on the top of the plane just ahead of the cockpit.

It is a nice plane for the money, but the instructions for the red plane are quite a bit different from the way this one goes together in some places. I've also added some reinforcement to the landing gear area and firewall as well, and upgraded the hardware.

I would/will buy another NitroPlane model again.

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       Post #: 52

RE: Nitro Models Pitts-40 Special Design - 2/23/2008 8:54:18 PM   
linkadrip



Posts: 1347
Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Wel not the greatest pics but some. i still have to put the control rod for the wings on have that left to do and fasten the cockpit canopy and get a fuel Dot. my last order i forgot to include one may just take a trip to the Distant Hobby shop. The tail wheel hardly moved so i made it a Caster type wheel it isnt attached to the tail. May give it some kind of airfoil so it will be straight on landing but i think it would be Straight from the air flowing over even if i don't.

I tested it connected to the rudder and it moved maybe 2 Degrees wouldn't steer at all pretty much. So if you change your tail gear make sure you get the gears pivot point close to the rudders piviot point the farther away from the pivot the less movemnet you will get. Have 2 more of the tail wheels i'm going to mount on other planes that need tail gear going to be a little more careful next time.

So not much left to do now. Balance Check CG after i get it all Squared away. Runs good kinda tricky getting the Glow Ingitor on and off but not to bad. Just reach under the cowl and twist and it pops off. No need for a remote glow ignitor. Would make it easier to start i guess, But i dont see a need for one i can fill it with fuel but its a real pain without a Fueler. I just hate taking the cowl back off to do it. But i'llhave to do it had a heck of a time getting it lined up the way i wanted it.

Well wish you luck with yours, mines been a littles stuborn at times, but I would get another Nitroplanes Seems there pretty good for the money.

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< Message edited by linkadrip -- 2/23/2008 8:58:44 PM >

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RE: Nitro Models Pitts-40 Special Design - 2/23/2008 9:17:10 PM   
pkevinb


 

Posts: 258
Joined: 2/23/2006
From: Meadville, PA, USA
Status: offline 		Looks good. I am at the point of connecting my ailerons now. I replaced the stock tailwheel too. I put the wings on for the first time today and couldn't get over how close the tail is to the rear of the main wing.

I'll be very interested to see how yours flies. I probably won't be able to maiden mine until the end of March because of the weather here. I bet it will be interestining maidening this plane.

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       Post #: 54

RE: Nitro Models Pitts-40 Special Design - 2/24/2008 1:38:21 AM   
opjose



Posts: 5473
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		Just keep it on the runway longer than you would normally as it runs up.

Resist the urge to pull it up if you are having yaw problems.

Let it come up only with slight backpressure.



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       Post #: 55

RE: Nitro Models Pitts-40 Special Design - 2/24/2008 9:02:55 AM   
linkadrip



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From: Tehachapi, CA, USA
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quote:

ORIGINAL: opjose

Just keep it on the runway longer than you would normally as it runs up.

Resist the urge to pull it up if you are having yaw problems.

Let it come up only with slight backpressure.



LOL forgot what YAW was. I might have Yaw problems with a Caster type Tail Wheel i'll keep it on the runway as long as i can before pulling up. going to set in Low rates for the tail. I'm wondering what would be the best deflection for the control surfaces. Curently i know there way to much. Figured i would go with the manual on the deflection.

Oh this is pretty neat i forgot what Yaw was but NASA helped me out.

http://www.grc.nasa.gov/WWW/K-12/airplane/yaw.html

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RE: Nitro Models Pitts-40 Special Design - 2/24/2008 11:31:01 AM   
opjose



Posts: 5473
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		You want a good bit of deflection available on the rudder to correct for yaw during run-up.

You do not want a lot of expo on the rudder though... for my high rates I rarely go over 20% expo on the rudder.

I'd put the wire into the pin ( at worst you can always make another one from a wood dowl ) back in.

The tail wheel does help to keep the plane tracking properly.

I've purposely done what you've did by accident, on some planes to give me very fine control on the tail, when the plane tends to yaw hard at run up.

While you may not be able to turn the plane in a tight radius, the tail wheel coupled with the rudder should keep the plane turning within the width of a standard RC runway, of say 50 feet.



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RE: Nitro Models Pitts-40 Special Design - 2/24/2008 4:18:55 PM   
pkevinb


 

Posts: 258
Joined: 2/23/2006
From: Meadville, PA, USA
Status: offline 		Thanks for the tips opjose. I have a GP Skybolt and Cox .40 size ultimate, so I am hoping it won't be too difficult. Does it tend to be pitch sensitive with the short tail moment? I think that is my main concern.

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       Post #: 58

RE: Nitro Models Pitts-40 Special Design - 2/25/2008 2:09:54 AM   
opjose



Posts: 5473
Joined: 11/26/2005
From: Poolesville, MD, USA
Status: offline 		Yup, so keep the tail movement within recommended at first, and then make your low rates about 50% of that.

I'd use 30 & 50% expo for low and high rates respectively.

Fly it this way and see how it works. At high rates you'll have the recommended throws, and if this proves too pitchy, you can hit the low rates.

You can always dial it back later once you are comfortable with the plane.



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RE: Nitro Models Pitts-40 Special Design - 2/26/2008 4:26:37 AM   
linkadrip



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Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Well finished the Control rods today still have some fine adjustment to make before flying it. Don't particularly care to much for the Clevises that come with the kit, cant get the rubber tubing over them they seem kinda flimsy. Probably will change that not to sure yetl. The Clevis i do have that are better don't fit the control rods there inside diameter is bigger then the rod so they dont thread on. So i just used the stock ones for now. IF i fly with the stock ones i'm going to definetly Find some rubber tubing that will fit over them they don't seem to lock.

What are you Guys using for the clevises and control rods for the Ailerons??

Checked the CG it states 4 inches past the leading edge of the top wing in the manual. Mine came out to 3" past the leading edge of the top wing. So i guess i'm going to have to move the battery back. Not much space inside the plane to do to much. I have the battery located above the landing gear at the moment. so i can move it back in the receiver area. Opjose were is your battery located?. I would ask to see what the inside of your looks like, but i know what a job it is to remove the bottom wing to take pictures. Unless you have pics of it when you were assembling it.

I should have done that. Took pictures, think I will since I have to remove the wing again anyway. Won't be to long now. Guess i will look for a dowl for the tail wheel wire not to certain about the tail wheel not being secure and able to move about free like it is. Possable disaster waiting to happen most likely. Even if the tail wheel doesn't move that much as far a turning at least it will be straight on a take off and landing. Seems more important to be straight and not cocked to one side or the other.

Going to have to get some graphics for it Personalize it a little So it doesn't look so Plain.

Should be a real thrill to fly. Definetly going to have to do some expo programing as suggested it would be insane to fly it without any the way it is now.

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< Message edited by linkadrip -- 2/26/2008 4:29:27 AM >

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RE: Nitro Models Pitts-40 Special Design - 2/26/2008 4:38:27 AM   
opjose



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Joined: 11/26/2005
From: Poolesville, MD, USA
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quote:

ORIGINAL: linkadrip

IF i fly with the stock ones i'm going to definetly Find some rubber tubing that will fit over them they don't seem to lock.


Grommets!

I had a bag of grommets from Rat Shack that were perfect for most clevises.

The included clevises work fine, but NEVER expand them as far as you might, say plastic clevises from Dubro, as they will break.

quote:

ORIGINAL: linkadrip

What are you Guys using for the clevises and control rods for the Ailerons??



I used the provided rods and clevises, however I installed Dubro Quick links... yeah I know people say they slip... but the only time I've had one slip was when I failed to put lock tight on them...

They sure make it easy to adjust the linkages though.

quote:

ORIGINAL: linkadrip

Opjose were is your battery located?.



Just aft of the canopy, behind my pilot.

quote:

ORIGINAL: linkadrip

Seems more important to be straight and not cocked to one side or the other.



I've place the dowl too far back on a couple of planes and it made almost no difference.

The turn radius is not tight on these, but then I don't have to worry about ground loops.

You only need a big turn radius to turn the plane around on an average airfield.

Consider re-affixing the control wire.


quote:

ORIGINAL: linkadrip

Definetly going to have to do some expo programing as suggested it would be insane to fly it without any the way it is now.


Yeah with the short coupled tail and the good sized control surface it can be fairly hairy the first time if you don't dial in expo.

Better to get your plane back down, and have to dial things UP, than to lawn-dart on your first flight....



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RE: Nitro Models Pitts-40 Special Design - 2/26/2008 8:23:15 AM   
linkadrip



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From: Tehachapi, CA, USA
Status: offline
quote:

Just aft of the canopy, behind my pilot.


How did you manage to get the Battery in there are you using a Small battery i have 1800 Mah 6 volt Nimha battery in mine. I'll see if i can get mine to fit back there.

The Dubro Clevises are what im using from the servos to the bottom Ailerons, but the Rods from the bottom to the top are smaller diameter and the clevises just slide on and off. Grommets i have some didn't thnk of using them thanks.
Going to re Affix the control Wire to afraid to leave it free floating.

Thanks for the reply Helps a bunch

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RE: Nitro Models Pitts-40 Special Design - 2/26/2008 4:47:39 PM