Kyosho P-51 Engine mount  
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Kyosho P-51 Engine mount - 9/29/2002 8:43:00 PM   
YoPete!



Posts: 6
Joined: 9/22/2002
From: Sebastian, FL, USA
Status: offline 		Guys,

I just got my Kyosho P-51 and I'm so excited about getting her ready but I need a quick answer from some of you that own one of these babies.

Ok first, When I look straight at the firewall at the engine center-line mark that Kyosho put there ,it just doesn't seem like it's to centered to me. So I took an empty toilet roll tube and inserted it down through the cowling front untill it hits the firewall square and sure enough this center-line mark is NOT excactly centered in the tube.
Now, is this like this because of the little bit (3 degrees) of right thrust I need to add to engine or do you think that the people or person who marked it, is off his mark a little? The firewall is just about 4" in width, but this center-line mark is definetly not in the center. It's a little bit to the right looking straight at it

Second question: How excactly do I get the 3 degree right thrust into the engine? The instructions say to put a 1/8" piece of wood behind the left engine mount. This particular engine mount is actually two seperate pieces of stock, so putting a spacer behind it would only push that side of the mount out 1/8" and not actually induce ANY right thrust at all right?
I mean I could see if the mount was one unit as a whole. Then by putting this spacer in would angle the whole unit and obtain this 3degree angle but with the mount being two seperate pieces it would'nt work would it?
If you guys can help me out a little I would sure apprecitae it!!
Man I looked for days for some info on this plane, I cant believe I found this forum with so much of it here!! I learned so much already to help make this maiden flight a succes(I hope!) LOL

Ok men! Thanks in advance

Pete
       Post #: 1

Kyosho P-51 Engine mount - 9/29/2002 9:20:40 PM   
Richard L.



Posts: 8775
Joined: 7/28/2002
From: Redmond, WA, USA
Status: offline 		First, the vertical line that Kyosho put on the firewall is correct. This line is slightly offset to the left. Once you mount the engine with the proper right thrust, the spinner will be centered with the front of the cowl.

Second, it's easy to get the right thrust with the two separate pieces of engine mount. Align the engine and drill holes in the two mounting beams the normal way, assuming that there is no right thrust. The mounting holes in one beam should be in the same positions as the mounting holes in the other beam. Then bolt the engine securely to the two beams. Now mount the entire unit to the firewall and guess what, when you add spacer underneath the left mount, the entire unit "as a whole" will tilt to the right. The engine has no choice but to tilt with the left beam since it is already bolted down.

(in reply to YoPete!)
       Post #: 2

Kyosho P-51 Engine mount - 9/30/2002 2:42:29 AM   
redxfred



Posts: 104
Joined: 9/28/2002
From: Strasburg, VA, USA
Status: offline 		Yopete: I had the same problem, but I found RCUniverse too late so now I have to live with it. Like a good little amateur builder, I centered the engine and bolted her on aimed straight ahead with no tilt. Now the cowl is all rigged and I'm committed to lots of right rudder on takeoff.

The problem: Some of us received no supplemental instructions and don't read Japanese! I think KYOTO is no longer on my list after comparing them to the other things available out there.

Be very careful with your unsheeted wings and stabilizer as they are puncture-prone.

(in reply to YoPete!)
       Post #: 3

Kyosho P-51 Engine mount - 10/2/2002 5:23:59 PM   
paladin


 

Posts: 1610
Joined: 2/13/2002
From: Vestal, NY, USA
Status: offline 		This is very interesting, I have the Me109 and will have to check the plans again but I do remember having to schim the mount ot remove theright thrust. It's really not needed.

I also wonder if they have moved the CG back for the Me109 like they did for the P-51D because I stopped flying mine early this summer and put it on the pile for needs work. It flew like a tracktor trailor fully loaded, and that is usually a sign that the CG is to far forward so I plan to start moving it back till it has the elevator authority I think it should have as long as it dose not pick up any bad habits on the way there.

(in reply to YoPete!)
       Post #: 4

Kyosho P-51 Engine mount - 10/2/2002 5:55:32 PM   
redxfred



Posts: 104
Joined: 9/28/2002
From: Strasburg, VA, USA
Status: offline 		Palladin,

My Mustang shares the same CG problem as your Target. The CG is too far forward and really tends to nose over during ground ops. That clued me not to fly it until the tail at least stays down during taxi.

I have the big, 4 cycle OS .52 which is probably the reason. I received no supplemental instructions with the kit so I just balanced on the wing spar. Can anyone give me balancing info from the supplemental instructions please? I don't even know what they use for datum.

I feel unbalanced,
Fred

"... there's two kinds of airplanes. Mustangs and Targets!"

_____________________________

... now, why did it do that?

(in reply to YoPete!)
       Post #: 5

Kyosho P-51 Engine mount - 10/2/2002 10:01:46 PM   
DaveCards


 

Posts: 28
Joined: 9/22/2002
Status: offline 		The supplemental instructions says to balance it at 133mm (127mm-140mm)

That is very much farther back than the original instructions which is 120mm-130mm.

What CG you using now?
At the moment i have mine at 122mm with the OS 4cycle 52, what do you think?

Dave

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       Post #: 6

Kyosho P-51 Engine mount - 10/2/2002 10:12:25 PM   
redxfred



Posts: 104
Joined: 9/28/2002
From: Strasburg, VA, USA
Status: offline 		Thanks, Dave. I don't know what datum you're using. Are you measuring from the leading edge at the wing root or what?

_____________________________

... now, why did it do that?

(in reply to YoPete!)
       Post #: 7

Kyosho P-51 Engine mount - 10/2/2002 11:37:53 PM   
DaveCards


 

Posts: 28
Joined: 9/22/2002
Status: offline 		Yes from the wing root. I just moved the CG back to 131mm. I feel more comfortable now, it should help the plane from nosing down. This will be its maiden flight as well.

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       Post #: 8

Kyosho P-51 Engine mount - 10/3/2002 1:21:40 AM   
redxfred



Posts: 104
Joined: 9/28/2002
From: Strasburg, VA, USA
Status: offline 		Good Luck! Thanks for your feedback.
Fred

_____________________________

... now, why did it do that?

(in reply to YoPete!)
       Post #: 9

Kyosho P-51 Engine mount - 10/12/2002 7:54:51 AM   
YoPete!



Posts: 6
Joined: 9/22/2002
From: Sebastian, FL, USA
Status: offline 		Yes guys, the plans call for 120-133 mm back from leading edge inverted at wing root. Mine was flying great but the cg was WAY far foward and I too had nose over problems today.
I moved cg to exactly 120 and I'll see what happens tomorrow!
Actually it's a just a tad nose heavy at 120mm.
I'll post tomorrow afternoon with EXCACT cg to let you know how it went. Keep fingers crossed!!! LOL

Pete

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       Post #: 10

Kyosho P-51 Engine mount - 10/12/2002 5:24:47 PM   
redxfred



Posts: 104
Joined: 9/28/2002
From: Strasburg, VA, USA
Status: offline 		Thanks, Pete!
That's exactly what I need to know...
Fred

_____________________________

... now, why did it do that?

(in reply to YoPete!)
       Post #: 11

Kyosho P-51 Engine mount - 10/12/2002 10:50:31 PM   
YoPete!



Posts: 6
Joined: 9/22/2002
From: Sebastian, FL, USA
Status: offline 		Red,

Ok bro! I just got back from the field and everything went great!First of all, I didn't have any nose overs at all. I just checked my CG and it is at 4 5/8" on top of the wing in close to the root of the wing. Put your mark there, then invert the plane and check it.

You know what though? I think the most important thing that let me NOT have any nose overs was that I bent the wheels forward enough so that the rear of the wheels was almost in line with the leading edge of the wing. Actually, my first flight was a nose over, but after bending the gear I didn't have any more. I enclosed a picture for you to see.

If you need any other info. or pictures I will be back home later tonight and will check my mail. Leave me your email address so I can send pics to you there. Alright Bro talk to you later.

Pete

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       Post #: 12

Kyosho P-51 Engine mount - 10/12/2002 10:51:20 PM   
YoPete!



Posts: 6
Joined: 9/22/2002
From: Sebastian, FL, USA
Status: offline 		ONE MORE PIC!

Pete

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       Post #: 13

Kyosho P-51 Engine mount - 10/17/2002 12:01:47 AM   
redxfred



Posts: 104
Joined: 9/28/2002
From: Strasburg, VA, USA
Status: offline 		Yopete!
Mine has mechanical retracts and they are placed exactly where your "down & welded" wheels are. I'm placing my CG 4 5/8" aft of LE like yours. If it crashes now, it's all YOUR fault....I am not responsible!
Fred

_____________________________

... now, why did it do that?

(in reply to YoPete!)
       Post #: 14

Kyosho P-51 Engine mount - 10/17/2002 1:48:03 AM   
paladin


 

Posts: 1610
Joined: 2/13/2002
From: Vestal, NY, USA
Status: offline 		redxfred, Where's that fighter pilot mentality! Get the wheels off the ground, then adjust for minimum smoke.

I'll move mine back slowly, personally. But then I fly a me 109 E.

Good luck!
There's only two types of Models: Those that have and those that are gona crash.

(in reply to YoPete!)
       Post #: 15

Kyosho P-51 Engine mount - 10/17/2002 1:52:39 AM