KMP B-25 CONSTRUCTION.  
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All Forums >> RC Airplanes >> Twin & Multi Engine RC Aircraft >> KMP B-25 CONSTRUCTION.
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KMP B-25 CONSTRUCTION. - 3/10/2005 12:49:29 AM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		A suggestion was made to start a construction thread so here it is.
This is OUR thread so ALL may contribute to it.
(besides, I'm working on 5 planes at once so I'm spread pretty thin).
I'm copying the last few pictures I had on the other thread.

This is the first of two boxes:

First picture:
As it arrived in box one.

Second picture:
Everything out of the box.
The fuse is fiberglass.

Third picture:
Hard foam wheels.
In case you want to get replacements, they measure 2 7/8" and 3 3/4".
Usual hardware stuff. The control horns are colored: nice so they match the plane.
The tanks are 8 oz (maybe 10). No label so I'm guessing.

Fourth picture:
Cowls with an OS FX .91 next to it for comparison.
The head will be sticking out the bottom but not by too much.

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< Message edited by samparfitt -- 3/10/2005 1:12:34 AM >

_____________________________

G. Samuel Parfitt
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RE: KMP B-25 CONSTRUCTION. - 3/10/2005 12:51:51 AM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		First picture:
Retracts appear sturdy and no slop noticed.
Looks like 3/16" diameter.
Will have to buy struts unless they're in the other box.
I plan on putting at least a medium robart air tank in, or if not enough room, 2 or 3 small ones.

Second picture:
Six canopies.
Already painted.

Third picture:
Nose retract area.

Fourth picture:
Nose retract with cover removed.


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G. Samuel Parfitt

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RE: KMP B-25 CONSTRUCTION. - 3/10/2005 12:53:11 AM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		first picture:
Where wing connects to the fuse.
No manual in this box.
Without the other box, that's it for now.


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_____________________________

G. Samuel Parfitt

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RE: KMP B-25 CONSTRUCTION. - 3/10/2005 1:02:37 AM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		The second box arrived today:

First picture:
As is, with the cover off.

Second picture:
The horizontal stab is the first item out.
It is built up wood, fabric covered and painted so all parts match.

Third picture:
Left wing.
Built up wood with fiberglass nacelles.
The wings are partially sheeted so the ribs show through the fabric covering.
Don't know if the real had this but it wood seem that
the entire wing would have been aluminum covered.
This wasn't real noticable (at least in the basement) and it would save on weight.

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< Message edited by samparfitt -- 3/10/2005 1:40:21 AM >

_____________________________

G. Samuel Parfitt

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       Post #: 4

RE: KMP B-25 CONSTRUCTION. - 3/10/2005 1:10:02 AM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		First picture:
Bottom of nacelles.
You can see the faint outline of the piece of fiberglass that is removable.

Second picture:
With piece of fiberglass removed.
That white line is the guide for optional wire controls of all 4 flaps by one LARGE servo.
There is not much room in there for larger tanks.
I bought 16 oz sullivan's flexible tanks and I'm not sure if I'll be able to get them in there.
There's a servo mount on both sides which I'm assuming for upright or inverted engines.
I may be able to carve some ply away and have the tank shifted to one side.
I don't thing this will affect fuel flow.
I may have to go to 12 oz flexible tanks.
The manual says 15 lbs.
With the one servo, versus four, controlling the flaps and one also for the rudder,
this may be possible.
I didn't see any instructions for elevator servos but I only looked through the manual quickly.
With this light of a twin, and using OS FX .91'x, I will be able to fly at 1/2 to 3/4 throttle
and save a lot on fuel consumption.
All the parts are very light so she may come in at 15 lbs.

Third picture:
Vertical tail and rudders.
Built up wood and fabric.
The manual also shows optional wire control with one servo of the rudders.

Fourth picture:
Loose assembly of the plane.
83" wingspan.
Seems like it would have been easier and stronger to make the top removable for
putting the wing on (but time will tell) instead of having the bottom removable.
The plane would also stay upright that way when putting her together at the field.
Four bolts instead of 2 dowels and 2 bolts are used to hold the wing to the fuse.
The wing is two pieces that obviously stays together.
I was thinking that we would have two outer wings to attached so the business part
would all stay together (again, time will tell on the design).
Struts will be needed.
I'm probably going the way of the P-61: 1/2" on the mains and 7/16" on the nose.
VQ and I think Robart has these.
All hinges are CA type: I'm using Great Planes medium nylon pinned hinges (GPMQ3972).

She looks nice, even in the 'loose' assembly stage.

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< Message edited by samparfitt -- 3/10/2005 1:42:16 AM >

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G. Samuel Parfitt

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       Post #: 5

RE: KMP B-25 CONSTRUCTION. - 3/10/2005 1:17:15 AM   
warks62



Posts: 573
Joined: 12/25/2003
From: Fresno, CA, USA
Status: offline 		I too had thought that the outer panels would be removeable but guess I can't have everything. Picking mine up this weekend and am ready to start to build right away. Does it look like you could do bomb bay doors?

_____________________________

Randy, member of the true 1/6th Royal Corsair Build

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RE: KMP B-25 CONSTRUCTION. - 3/10/2005 1:42:45 AM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		With the bottom removable instead of the top, it seems like bomb bay doors are going to
be difficult to do.

I take that back, looking at the size and the strength of the removable part,
you may be able to put a 'self contained' mechanism in there.

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< Message edited by samparfitt -- 3/10/2005 1:51:33 AM >

_____________________________

G. Samuel Parfitt

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       Post #: 7

RE: KMP B-25 CONSTRUCTION. - 3/10/2005 9:33:33 AM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		I read through the manual last night.
Picture 46 in the manual says elevator servo: this is really the rudder servo.
Picture 61 shows how the elevator is connected: the traditional way with the
servo in the middle of the fuse and a dowel and two rods coming off of it to connect to
the elevator on each side of the fuse.
The rudders are controlled by two mini servos out on the end of the horizontal stab,
or with one servo in the center moving two wires in guides that route to each rudder.
I'll probably go the one servo, wire guide route to save weight back there.
Page 17 of the manual shows these 'wire guide' alternatives to controlling the flaps and rudders.

_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 8

RE: KMP B-25 CONSTRUCTION. - 3/10/2005 5:24:49 PM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Excellent data on 'heavenly body':
http://www.b25.net/


www.vqmodelaircraft.com has the struts that we need:
two 1/2" straight struts.
one 7/16" right offset (from pilot's view, want fork pointing back and offset to the right).
I'm going with the short offset: 2-2 7/8" wheel.
They also have the long offset: 3-5" wheel.
they also have machine guns: looks like at least 10 are needed.
(he has good prices on these struts and the guns are presently on sale).

< Message edited by samparfitt -- 3/10/2005 10:16:32 PM >

_____________________________

G. Samuel Parfitt

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       Post #: 9

RE: KMP B-25 CONSTRUCTION. - 3/10/2005 5:28:44 PM   
mtrounds


 

Posts: 31
Joined: 4/5/2004
From: Schaumburg, IL, USA
Status: offline 		I think the way you are going to go will work out better. I am going to install battery packs in place of the fuel tanks,as I am doing elect powered.

(in reply to samparfitt)
       Post #: 10

RE: KMP B-25 CONSTRUCTION. - 3/10/2005 5:43:03 PM   
samparfitt


 

Posts: 1647
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		mtrounds,
please post on here your electric conversion.
Also, exact part names, numbers, pictures, prices, purchase location, etc so we can see what
is actually used since most of us have little knowledge on what to get for electrics
and also use for possible future projects.
Thanks,
Sam

_____________________________

G. Samuel Parfitt

(in reply to mtrounds)
       Post #: 11

RE: KMP B-25 CONSTRUCTION. - 3/10/2005 6:00:29 PM   
mtrounds


 

Posts: 31
Joined: 4/5/2004
From: Schaumburg, IL, USA
Status: offline 		Sam,