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Old Apr 12, 2004, 01:03 AM
Registered User
New Zealand
Joined Feb 2003
357 Posts
To warren and those who scale up the micropitts:
I am very interested in your effort to scale up the micropitt. Like many I found the RFFS system a bit too steep and I have lots of pico servos / micro rx lying around which i would like to use. I have a few questions:

1. By scaling it up 75% you mean 1.75x of original right?
2. Do you have to use thicker balsa since the scale is now different?
3. How do you mount the GWS IPS unit to the plane? Any pics?

Thanks for your suggestions

Henry
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Old Apr 13, 2004, 04:39 AM
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Brian Freer's Avatar
Joined Jan 2004
138 Posts
I've got a crazy idea: I'm thinking of stuffing some standard micro gear (15g worth) and a DD dcm 189 motor set up in the little pitts. I'll be ending up at about 4.5 oz auw with about 5.5 oz thrust. Think it'll work?

-Brian
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Old Apr 13, 2004, 08:21 AM
Gravity is a harsh mistress.
Tim Wolff's Avatar
United States, MI, Temperance
Joined Sep 2002
6,611 Posts
Quote:
Originally Posted by Brian Freer
I've got a crazy idea: I'm thinking of stuffing some standard micro gear (15g worth) and a DD dcm 189 motor set up in the little pitts. I'll be ending up at about 4.5 oz auw with about 5.5 oz thrust. Think it'll work?

-Brian
Sounds like a guided missle
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Old Apr 13, 2004, 09:38 AM
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Brian Freer's Avatar
Joined Jan 2004
138 Posts
Quote:
Originally Posted by tiberius
Sounds like a guided missle
Prescisely!
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Old Apr 13, 2004, 05:28 PM
AllAloneInSpaceAndTime
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Canada, ON, Guelph
Joined Apr 2003
2,389 Posts
Brian,
I like your idea too. I printed out the plans for it, but am having a little trouble scaling them up. I need a photocopier...
1.75% sounds about right.

What prop do you plan on using, and what material for the airframe? I've been having pretty good results with a 4.5x4. But have no exact thrust measurements on it with the J250.

TTYL
Corey
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Old Apr 16, 2004, 04:47 PM
Registered User
Worcester, MA
Joined Oct 2003
8 Posts
Does this style of construction have a name? Chris3D's planes work well for 2x enlargment. I would like to see some warbirds done with this method. I may attempt one myself in the future.

Do you design the plane in 3D in CAD and then unroll it to a flat plane for templates?

nismo240
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Old Apr 16, 2004, 11:35 PM
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Brian Freer's Avatar
Joined Jan 2004
138 Posts
Corey:

I haven't decided on a power system yet, but I think I might put a J250 in an EPS 100 gearbox (6:1) which should yeild pretty good thrust results. As for the scaling and materials, I went too my local copy center and had them blow up the plans to 175% which cost me like $1.75. Since duplication of balsa exactly to proportion whith the plan enlargments isn't possible (can't buy 1.75/32 balsa sheet) I just doubled all the thicknesses (I'm using 1/16 balsa for the sheeting, 1/8 basswood for the cowl since it's a bit more durable, and 1/4 balsa for the wheel pants and wheels). It should end up a bit fat but that shouldn't matter since it's going to be ridiculously overpowered anyway .

I am having a little trouble deciding how to color it though, I wanted to stain it originaly, but the stain just doesn't look too hot on balsa, so I think I might just try the fabric dye.

-Brian
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Old Apr 16, 2004, 11:39 PM
I Just Need This One Part
Jchas26's Avatar
Cartersville, Georgia
Joined Jun 2002
431 Posts
Here is one I did a while back. Man I love this plane. Runs On A GWS Dual Drive IPS. And 8 NIMH. Pretty Much just scaled up the micro Pitts with minor mods to the LG and battery hatch. It is all peeled sturdy board with clear vinyl laminate. Yeah that is a real pic of it hanging on the prop too.
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Old Apr 17, 2004, 12:31 AM
Zoom, zoom...
Trikster's Avatar
Roseville, CA (Sacramento area)
Joined May 2003
3,514 Posts
I have been planning on doing a J250 version of both the Pitts and the Moth from Chris Riley. I am running into roadblocks with DepronUSA and FoamFly.com... They don't return my emails...
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Old Apr 17, 2004, 10:51 PM
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Brian Freer's Avatar
Joined Jan 2004
138 Posts
Quote:
Originally Posted by Trikster
I have been planning on doing a J250 version of both the Pitts and the Moth from Chris Riley. I am running into roadblocks with DepronUSA and FoamFly.com... They don't return my emails...
Dan (www.foamfly.com) is a VERY busy guy, always halfway across the country somewhere or other. Just be persistent, try sending him some pm's and he'll respond eventually.

-Brian
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Old Apr 19, 2004, 07:55 PM
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Alfredo Rubio's Avatar
guadalajara, jalisco, mexico
Joined Sep 2002
9,268 Posts
Pierre, I went to a profile Pitts too, but smaller than ChrisīPitts, mine is 11" WS and weigh is 25 gms. is the smaller RC plane in Mexico!!!!!! I confirmed it is the JMP red one, the smaller is a plastic model 1:72 scale in the old Brian lecombrīs Pitts from England.
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Old May 12, 2004, 10:57 PM
Strange Plane Central
frankenfoamy's Avatar
Poway (near San Diego), CA US
Joined Dec 2000
1,884 Posts
finished my lazer cut kit.
I left it unpainted to see what the weight would be.
27 g RTF + 5 g weight to achieve CG

Thanks Chris
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Old May 12, 2004, 11:21 PM
Zoom, zoom...
Trikster's Avatar
Roseville, CA (Sacramento area)
Joined May 2003
3,514 Posts
Looks real good. Is this the DWE kit?
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Old May 12, 2004, 11:37 PM
Team 30 Micro EDF
Mike Taylor's Avatar
Camarillo, California
Joined Apr 2002
4,516 Posts
Ouch! Nose weight! That's why I like the remote actuators...
You could run the the next larger size LiPoly cell and make some of that weight do some good... You get a little more power (or so it seems).
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Old May 13, 2004, 12:24 AM
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Alfredo Rubio's Avatar
guadalajara, jalisco, mexico
Joined Sep 2002
9,268 Posts
Nice plane...as the Pitts must to be Please tell us your flight experience.

Cheers
Alfredo Rubio
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