I am just starting a scratch building project and I am using a set of Pilot plans. I hear that Pilot has a good flying Eagle. I decided to scale up the Pilot Eagle to be the same size as the Great Planes Christen Eagle, which is just a little larger then the Pilot Eagle, but not much larger. The Pilot Eagle has a 64-inch top wing and the GP Eagle has a 68-inch top wing.

Now since I am a scratch builder, I change things to hopefully improve the end product. The best Pitts that I have flown has been the Cermark Pitts by Dave Patrick. So I would love it if my Eagle flew as well.

Here are the incidence #’s on all three planes.

----------------------TW-----BW--Stab-motor---Dihedral
Cermark Pitts-------------0------ 0-- +2----0 ------- ?

Pilot Eagle----------------0------ 0--- 0---- 0------- +1

GP Christen Eagle-------+1/2---(-1)---0----2.5 down- +5

My project -------------- 0------ 0--- 0---- 0------- +2.5


Am I on the right track or am I over looking something?

tonyc

Hi TC!

Glad to hear someone else scratches too..

Am doing the Pilot Pitts in the 1/3rd size..so you can add the following to your chart.

TW = 1+ BW = 0 Stab = 0 Engine DT = 1.5- RT = 3 This is from the Plans..so am only changing to more DT to 2.25 the rest stays the same. Should handle the G-62 Zenogh that way.

On the various aircraft you mentioned no notes on the airfoils, Top Wing..?? verses Bottom wing ?? This would have a definite bearing on the final result. The Pilot Pitts also has a symetrical top wing and a semi symetrical lower wing.. definately not a clark Y. Though am changing it to the same section as that of the top wing and will keep the lower wing setting at 0.

I have the Steen Skybolt that Dario B. and Lamar Steen co-designed from the orginial plans of Lamars. The following are from it...TW = 2+ BW = 0 Stab = 0 Engine DT = 2- RT = 3 and both wings are of the same airfoil.

Later

Thanks for the reply Doug.
So far I have the basic fuse box constructed. This is not by the plans but this is the way I like to build.
I have set the motor at +3 right and 0 down, the stab is +2 and the wings will be at 0. Wings are symmetrical.

Will yours have a 72 inch wing?

tonyc

Hi, TC

I see, no down thrust plus 2+ on the stab will put you slightly tail high even with no power. Guess it's the pilots preference in that respect. I always figured in the early days that the stab was a crowbar on the excessive wing incidence used ala Pappy deBolts((and other designers) livewire designs..
The Cubs and the livewire trainers set up the wing at 14+ on the wing 5 to 7 + on the stab....then 3 to 5 degrees down for the engine. Course we would fly a 10/12 lb airplane on a .09 to .19 usually a K&B. Once in a while some brave soul would show up with an O&R .23 or .29 glow in em.

Heheh...lots of heartaches in those days but kind of fun to laugh about em now.


Tony....when your done with your Eagle is there any way I can get a set of your Pilot Eagle Plans...maybe a trade with a set of my Pilot Pitts Plans? If so, I have to have two sets done at Kinkos so another set won't upset my budget to much..
As the GP parts fit the Pilot Pitts maybe the GP Eagle stuff will fit the Pilot Eagle also..hummm
I wonder?



Here's a shot of my scratch Pitts S2A with the Zenogh G62 onboard and top wing span of 70 in. as of a bit ago..have more done now but alas no fresh pics lately..

Hi you guys!
Would you like it from the horse's mouth with a good guarantee?
This is tried and true>
Incidence>
Top wing> +2 deg
Bottom wing> 0 deg.
Horizontal stanilizer> +3 deg
Balance>
On side view, from high point of each airfoil strike a line connecting.
If wings are equal size mark line at 50% point. Strike a horizontal
line at that point ( some lower wings are 2/3 of uppper. In that case
measure up the line 2/3 and put H lione there)
From the line intersection drop a vertical line to fuselage bottom. Mark that point.
You need a number such as 10% of the wing chord, say 1.5"
Take the fuselage with all on it except the wings and from the exsisting
mark make another 10% forward from it. This is balance point.
Teeter the fuselage on a stick to find fore and aft balance./
Adjust balance to match the 10% forward mark
Engine thrust> zero deg. (straight)
How' zat?
Be interesting to hear what happens if you use this arrnagement, OK?
Good luck and be good!

Hal [email protected]