RE: KMP B-25 CONSTRUCTION.  
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RE: KMP B-25 CONSTRUCTION. - 3/23/2005 1:27:26 PM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Terry,
Tower says they weigh 19.42 oz, add maybe 5 more for muffler and they're about the same as your engines.
She'll be ready to fly shortly, but Ohio weather says 4-6 weeks.
I'll be going back to working on my TF ARF P-51 and maybe finish off the last stuff on the P-61 and GSP F4U.
I've been recycling/charging some of last years batteries and two have headed south.

< Message edited by samparfitt -- 3/23/2005 1:29:50 PM >

_____________________________

G. Samuel Parfitt

(in reply to TLH101)
       Post #: 101

RE: KMP B-25 CONSTRUCTION. - 3/23/2005 7:25:18 PM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Engines:
Before I forget...again.
When I was installing my new engines, just about all the bolts needed tightening on the head cylinder and back cover.
I was able to turn them from 1/16 to 1/8 additional turns.

_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 102

RE: KMP B-25 CONSTRUCTION. - 3/24/2005 1:51:52 AM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		CG (continued)

First picture:
I didn't know there is a small compartment past where I have the air tank and the retract mount (oval type hole above
retract). I put my two 5-cell batteries in there.
There's access to this small compartment via a hole below the retract where the air tank is.
The CG was now about 3/8" back. With the lead weight you see on the fuse,
she's now a little nose heavy which is good (for now).


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< Message edited by samparfitt -- 3/24/2005 1:54:05 AM >

_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 103

RE: KMP B-25 CONSTRUCTION. - 3/25/2005 2:50:03 AM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Final fuse servo tray setup.

First picture:
Everything's in its place.
The air fill and gauge is at the top of the picture.
Two brass rods connected via easy connects drilled and epoxied into the on/off switches
are at the bottom (switches are mounted to the servo tray with just the less obtrusive brass rods sticking out
of the fuse).
The three 2' extensions (ail, thro, flaps) and air line for connecting to the wing are at the bottom of the picture.
The receiver is under the servo tray just south of the air valve in the picture.
The receiver antenna is in the white tube running internally back through the fuse.

Second picture:
Better view of the two brass on/off rods.
Pushing in is 'ON' in case of accidental hitting while starting engines and/or releasing/carrying plane.

Third picture:
I put the voltwatch inside the cockpit for quick view of the battery's condition.
This also keeps the charging jacks inside since the wing has to be off anyway to charge the batteries.

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< Message edited by samparfitt -- 3/25/2005 2:55:55 AM >

_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 104

RE: KMP B-25 CONSTRUCTION. - 3/25/2005 3:21:46 AM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		No words needed!
(nose steering and cover needed yet, plus the top turret)


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< Message edited by samparfitt -- 3/25/2005 3:24:03 AM >

_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 105

RE: KMP B-25 CONSTRUCTION. - 3/25/2005 11:43:27 PM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Nose gear (continued)

First picture:
I epoxied 2 bass blocks with holes to put the guide tubes through to
keep the pull/pull wires to the side so the strut can retract without entangling in the wires.
I used Sullivan's Gold-n-cable #507.

Second picture:
Top view.
No way that struts going to catch on those wires!

Third picture:
With cover on.
I had to sand the edges so the cover would fit perfectly into the recess on the fuse.

Fourth picture:
Front view.

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< Message edited by samparfitt -- 3/25/2005 11:54:00 PM >

_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 106

RE: KMP B-25 CONSTRUCTION. - 3/25/2005 11:49:27 PM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		'Touch ups'

First picture:
Cutting off the excess bolts sticking out on the control horns.
Have to paint them yet too to blend with the plane.

Second picture:
I epoxied the guide tubing to the access hatches so they don't move.
I noticed the guide tubes moving when operating the flaps and the flaps were not returning to
their original position. If you still have this problem, the tubes may be moving inside and more
epoxy will be needed.

Third picture:
I don't know about you pilots,
but there's no way in h@ll that I'm NOT going to scratch that tail skid,
so I'm going to epoxy a piece of oak on it.
I noticed the same thing on the P-61.
That is only covering on balsa so it definitely needs some oak skids.

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< Message edited by samparfitt -- 3/25/2005 11:55:16 PM >

_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 107

RE: KMP B-25 CONSTRUCTION. - 3/27/2005 3:23:54 AM   
scottonium


 

Posts: 29
Joined: 1/2/2003
From: Austin, TX, USA
Status: offline 		Question for the forum. I've notice everyone has put big engines in the B-25. When I spoke with Andrew from KMP he suggested the 70 4-Stroke or 60 2-Stroke were more than sufficent power and suggested one could get away with two 46's or 52-56 4's. He also suggested the larger the motor the more difficult to control on a flame out or one engine operation. Does anyone have any thoughts. I'm perosnally considering two OS 52's which should produce 0.9hp each vs. two OS 70's at 1.1 hp each. The advantage will be in less foreward mass and a more concielde engines with much longer run time. I fly scale and don't think I will be doing airobatics with this plane. Please If there is a rule of thumb or equation for calculating how much hp/lb of airplane I need, that would be helpful.

< Message edited by scottonium -- 3/27/2005 1:49:00 PM >

(in reply to samparfitt)
       Post #: 108

RE: KMP B-25 CONSTRUCTION. - 3/27/2005 8:02:29 AM   
William Robison



Posts: 20269
Joined: 11/10/2002
From: Mary Esther, Florida, FL, USA
Status: offline 		Scott:

The thing about twins being "Safer" with lower powered engines is the immediate reaction when one quits running. The more powerful the individual engines, the more violent the immediate yaw. That's all there is to it.

You have to decide on how much power you want, and go from there.

Bill.

_____________________________

Real Airplanes have Two Engines
AMA 25139 - More than 40 years.

(in reply to scottonium)
       Post #: 109

RE: KMP B-25 CONSTRUCTION. - 3/28/2005 2:57:51 AM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Touch Ups (continued).

First picture:
The two plys I cut out to strengthen the turret.

Second picture:
The two plys epoxied in.

Third picture:
I painted the plys and used 4 button screws to hold the turret on.
Side view (air filler and gauge on this fuse side).

Fourth picture:
Two on/off brass rods on this fuse side.

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_____________________________

G. Samuel Parfitt

(in reply to William Robison)
       Post #: 110

RE: KMP B-25 CONSTRUCTION. - 3/28/2005 3:01:05 AM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Touch ups (continued)

First picture:
I used a laser level to get the CG's next to the fuse and on the wing tips.
(black lines on bottom of wing).

Second picture:
Fuse CG is 4 5/8" back from LE of wing.

Third picture:
Wing tip CG is 1 1/2" back.

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_____________________________

G. Samuel Parfitt

(in reply to samparfitt)
       Post #: 111

RE: KMP B-25 CONSTRUCTION. - 3/28/2005 3:06:01 AM   
samparfitt


 

Posts: 1873
Joined: 9/1/2002
From: West Chester, OH, USA
Status: offline 		Touch ups (continued)

First picture:
A piece of oak on the tail skid to protect it.
(not too prototype but functional!)

Second picture:
I almost forgot to also epoxy the guide tubes in the stab.



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