GP Super Stearman with 50cc build

GP Super Stearman with 50cc build
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GP Super Stearman with 50cc build - 5/13/2008 4:48:41 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

I am going to start a build thread on the Great Planes Super Stearman with a CRRC Pro GF50I ( 50cc gasser ).
First things first, YES I know it is over power.
I have the two sitting and figured I will match them together.
I DO NOT plan on sreaming this plane wide open down the runway. The only time I am going to do any wide open is going to be in the verticle postition.
Well I am going to shot my expected weight of 16 1/2 lbs. ( dry ) and we will see how close I will be when it all is together.
I also am installing a full smoke system in the aircraft.
This plane should look awsome doing stall turns and monster loops with full smoke on.
These are some weights as the are now.

Built fuselage ( no radio or tank ) has landing gear, wheels, wheel pants, tail whell assy, all surfaces, deck, windsheilds, pilots
73.5 oz.

Top wing, bottom wing with all mounting braces.
65.5 oz.

Cowling, spinner, fuel tank, hardware, quick filler, fuel line
19.0 oz.

Servos:
Four Futaba S3305
One Futaba S3004
Extensions and switches
One 6V 2000 mah battery
Futaba FASST RX
Opto kill switch
11.5 oz.

Full smoker sysytem:
Sullivan Skywriter
20 oz smoke tank
6V 2000 mah battery
switch harness
15.5 oz.

CRRC Pro GF50I
Ignition, muffler, switch harness and ignition battery
62.5 oz

Prop, custom stand offs and mounting bolts
8 oz.

I will do pictures as I go along and do some numbers as I break in the engine.

< Message edited by 2robinhood -- 5/13/2008 6:46:05 AM >

Post #: 1

RE: GP Super Stearman 50cc build - 5/13/2008 4:50:42 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

Here are some pictures of the mount I am making to hold my smokers assy.

(in reply to 2robinhood)

Post #: 2

RE: GP Super Stearman 50cc build - 5/13/2008 5:01:04 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

Engine is a CRRC Pro GF50I
I purchased the Pitts muffler and am going to use it on this project.

Specs:
Displacement: 50cc
Bore x Stroke: 43mm x 34mm
Dry Weight: 1660g (3.63 lbs.)
Carburetor: Walbro butterfly type w/pump
Max Output: 4.9 HP @ 7500 rpm
Ignition: 4.8v Auto Timing Ignition
Fuel: 93 plus octane premixed 40:1
Propeller: 20 X 10 , 22 x 10 ,22 x 8

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Post #: 3

RE: GP Super Stearman with 50cc build - 5/13/2008 3:57:50 PM

Nathan King

Posts: 1300
Joined: 5/29/2007
From: Omaha, NE, USA
Status: online

It looks good. I know this model requires ballast up front, but won't that 50cc be a little bit too much weight up there (requiring tail weight)?

_____________________________

Nate,
WACO Brotherhood #99

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Post #: 4

RE: GP Super Stearman with 50cc build - 5/14/2008 12:44:21 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

quote:

ORIGINAL: Nathan King

It looks good. I know this model requires ballast up front, but won't that 50cc be a little bit too much weight up there (requiring tail weight)?

I plan on mounting my smoker assemely and batteries towards the tail. I think I should be OK by adjusting my extra items around without adding weight.
The GP Stearman needs 18 oz. of added weight to the nose to ballance with a OS 1.20 four stroke.

OS 1.20 + 18 oz of lead = 51.5 oz.

CRRC 50cc with muffler and ignition = 58.5 oz.

I think I can overcome the extra 7 oz. being on such a short segment in front of the CG.

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Post #: 5

RE: GP Super Stearman with 50cc build - 5/14/2008 4:47:52 AM

Nathan King

Posts: 1300
Joined: 5/29/2007
From: Omaha, NE, USA
Status: online

Cool. It sounds like you've planned things out well. I can't wait to see it finished!

_____________________________

Nate,
WACO Brotherhood #99

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Post #: 6

RE: GP Super Stearman with 50cc build - 5/14/2008 6:13:58 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

Just a fast update.
I am using Robart pin hinges instead of the CA hinges.
Ailerons are the 3/16" pin hinges, while elevator and rudder is 1/8" pin hinges.
Fuel tank set up, of coarse a gasoline stopper, walbro felt filter/clunk, and Aerotrend easy flex gasoline fuel line.

< Message edited by 2robinhood -- 5/14/2008 6:17:47 AM >

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Post #: 7

RE: GP Super Stearman with 50cc build - 5/15/2008 4:49:27 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

Pretty much got the smoker assembly finished.
Unit is assemled, mounting rails are in fuse.
Just need to mount the switch and fuel dot for the smoke tank.
I used velcro between tank and mounting plates, between smoke pump and tank, between battery and tank.
Then used zip ties to secure everything.
Assembly as you see it with a switch harness is 16.3 oz.

< Message edited by 2robinhood -- 5/15/2008 4:56:43 AM >

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Post #: 8

RE: GP Super Stearman with 50cc build - 5/17/2008 8:18:09 PM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

Just took my CRRC Pro GF50I ( 50cc ) out of the box.

After 8 oz. of fuel run, needles at factory settings, I did some quick 5 second burst of wide open for some rpm numbers.

Xoar 19 X 8 @ 8200

Xoar 20 X 8 @ 7500

Zinger Pro 22 X 8 @ 6900

APC 22 X 10 @ 6700

JFX 23 X 8 @ 5600

< Message edited by 2robinhood -- 5/17/2008 8:34:32 PM >

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Post #: 9

RE: GP Super Stearman with 50cc build - 5/17/2008 11:38:49 PM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

New numbers for the CRRC 50cc:

After 16 oz of fuel run.

Xoar 19 X 8 @ 8400

Xoar 20 X 8 @ 7900

Zinger Pro 22 X 8 @ 7100

APC 22 X 10 @ 6900

After 24 oz of fuel.

Zinger Pro 22 X 8 @ 7200

Vess 22B @ 6800

Majzlik 22 X 10 @ 6800

< Message edited by 2robinhood -- 5/18/2008 6:32:47 PM >

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Post #: 10

RE: GP Super Stearman with 50cc build - 5/18/2008 12:39:04 AM

Nathan King

Posts: 1300
Joined: 5/29/2007
From: Omaha, NE, USA
Status: online

Those numbers look really good to me!

_____________________________

Nate,
WACO Brotherhood #99

(in reply to 2robinhood)

Post #: 11

RE: GP Super Stearman with 50cc build - 5/21/2008 6:14:38 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

Update:
A little further, engine is mounted, wings are on, and control surfaces are glued.
Next will be plumbing smoke lines and control linkages.

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Post #: 12

RE: GP Super Stearman with 50cc build - 6/2/2008 4:41:05 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

Got a little more done.
Mounted servos and Opto kill switch.
Each elevator half has it's own servo, instead of connecting two pushrods together.
Hardest part was getting the throttle linkage past the smoke system and having it get the throttle to stick position correct.
I put the wings on for a quick balance check.
No RX battery or ignition battery in in yet, and it balanced perfectly to the manuals CG.
I should be ok, and able to adjust batteries around and not ad any weight to the plane.

< Message edited by 2robinhood -- 6/19/2008 2:56:02 AM >

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Post #: 13

RE: GP Super Stearman with 50cc build - 6/19/2008 2:56:19 AM

2robinhood

Posts: 330
Joined: 8/27/2006
From: Egg Harbor City, NJ, USA
Status: offline

I'm still alive.
Just been trying to get my 33% in the air.
I'll keep you posted.

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