Kyosho P-40/AT-6 + OS 61FX !!!  
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All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> Kyosho P-40/AT-6 + OS 61FX !!!
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Kyosho P-40/AT-6 + OS 61FX !!! - 3/29/2004 3:32:32 PM   
Zipperneck



Posts: 160
Joined: 9/15/2003
From: Plan de la Tour, FRANCE
Status: offline 		I'm the proud owner of a Kyosho P-40 and AT-6 - still in the box - and I'm considering pushing the envelope a bit by installing an OS-61 FX in one of these puppies...

Any comments? Do you think it can be done (without dire consequences)?

Zipperneck
(Chuck Yeager's lesser known younger brother)
       Post #: 1

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 3/30/2004 1:39:25 PM   
vinnie



Posts: 651
Joined: 1/7/2002
From: hollywood, MD, USA
Status: offline 		Zipper,
I flew my Kyosho AT-6 using a SuperTigre .61 mounted horizontally with a Pitts and it was just about adequate. You should have no problem with your engine choice.

_____________________________

Regards,
vinnie
AMA 680367

(in reply to Zipperneck)
       Post #: 2

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 3/30/2004 2:20:15 PM   
Zipperneck



Posts: 160
Joined: 9/15/2003
From: Plan de la Tour, FRANCE
Status: offline 		Well, I figured as much. The guys at my club are pretty much of the same opinion.

However.... I called the good people at Tower and Hobbico and spoke with them about the question.

They obviously based their argument on Kyosho's max. engine recommendations (an OS .46 FX, for example), saying that an OS 61FX would be too powerful for the airframe and possibly vibrate it apart.

As far as size goes, the 61 is slightly taller/wider and weighs about 6.2 oz more.

Any more comments from anybody would be helpful!

Tnx,
Zipperneck

(in reply to vinnie)
       Post #: 3

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 3/30/2004 4:10:53 PM   
Kmot



Posts: 7740
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		I also have a NIB Kyosho AT-6 sitting on the shelf and was going to initially power it with a .46 but after extensive Google research have found the major opinion is to go much larger on the engine.

Here is an excellent video of a Kyosho AT-6 with retracts and powered with an Irvine .72 engine:

http://gugge.zapto.org/video/at-6.wmv

_____________________________

DRILL BABY DRILL!!!

(in reply to Zipperneck)
       Post #: 4

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 3/30/2004 4:53:29 PM   
Zipperneck



Posts: 160
Joined: 9/15/2003
From: Plan de la Tour, FRANCE
Status: offline 		Ok - but what about the size.

According to OS's web site. The OS 46FX is 51mm wide and 88mm tall, whereas the OS 61FX is 61mm wide and 100.5mm tall and 13.2 oz and 19.4 oz respectively.

The cowling on the P-40 is only 105mm wide, leaving only 22mm left on each side - not counting the muffler (I ordered a Slimliensport muffler - LXFH00).

I just hope it fits into either the P-40 or the AT-6 and that the weight is not a problem. I just hope cooling is not a problem due to the reduced space (if it fits).

I plan to put Euro-Kit pneumatic retracts in these puppies, by the way.

Zipperneck

(in reply to Kmot)
       Post #: 5

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 3/31/2004 12:05:19 AM   
vinnie



Posts: 651
Joined: 1/7/2002
From: hollywood, MD, USA
Status: offline 		I can't speak for the P-40 but I can assure you that weight will not be an issue with the AT-6. You will need to add weight to the nose with anything short of an M1 Abrams tank engine. Trust me.

_____________________________

Regards,
vinnie
AMA 680367

(in reply to Zipperneck)
       Post #: 6

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/2/2004 3:51:07 PM   
optech



Posts: 266
Joined: 1/26/2002
From: Yuma, AZ, USA
Status: offline 		I guarrantee you if you fly the P-40 with a .61 you'll blow the horizontal stabilizer off in half the time the .46 does. This is one of the reasons the P-40 was discontinued. Beef it up or you'll lose it.

Mike

(in reply to vinnie)
       Post #: 7

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/2/2004 4:46:22 PM   
Zipperneck



Posts: 160
Joined: 9/15/2003
From: Plan de la Tour, FRANCE
Status: offline 		Well Mike, that sounds like pretty sound advice.

Now that you mention it, I believe I saw a thread on the same subject on a Jamara Spitfire....

I'll check it out and beef it up. Thanks for the heads up.

Zipperneck

(in reply to optech)
       Post #: 8

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/2/2004 10:44:22 PM   
daven



Posts: 6908
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		I use to fly my Kyosho Spitfire with the O.S. .61 FX and it was a ball to fly. It wasn't fast enough, so I now use a Jett .50.

I have been amazed that it has held up. I did strengthen the firewall and tail area. On one high speed pass I did lose a patch of covering off the bottom of the wing. A piece about 6" in circumfrence just blew out.

No other problems though, with many flights over a 2 year period.

_____________________________

Dave Norman

klasskote.com
supertrc.com

(in reply to Zipperneck)
       Post #: 9

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/3/2004 7:02:35 AM   
Zipperneck



Posts: 160
Joined: 9/15/2003
From: Plan de la Tour, FRANCE
Status: offline 		Dave,
What did you do to beef up the firewall?

Zipperneck

(in reply to daven)
       Post #: 10

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/5/2004 4:12:12 PM   
Zipperneck



Posts: 160
Joined: 9/15/2003
From: Plan de la Tour, FRANCE
Status: offline 		Dave,
Just curious, what size prop are you turning with that OS 61 on your spit?

Zip

(in reply to Zipperneck)
       Post #: 11

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/5/2004 5:14:51 PM   
daven



Posts: 6908
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		I epoxied an additional piece of 1/8" aircraft ply on the back of the existing firewall and layed in fiberglass as best I could in the corners. Work with a bunch of small pieces of fiberglass and overlap them, push them in place with a small brush with your resin.

With the O.S. .61 FX I used a 10x8 and a 11x7 APC props.

With the Jett .50 I use a 10x7 and its quite a bit faster.

_____________________________

Dave Norman

klasskote.com
supertrc.com

(in reply to Zipperneck)
       Post #: 12

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/5/2004 6:49:46 PM   
SkillnotLuck


 

Posts: 69
Joined: 10/11/2003
From: Marietta, GA, USA
Status: offline 		Here is my Kyosho P-40 that I just finished. As you can see, I've made a few modifications. This is my second P-40. The first one crashed do to horizontal stab failure. This one has a custom made stab that I built up out of 1/4 inch balsa. I also got rid of the dowels in favor of push-rods. Some of you might think I'm crazy, but I think there's a link between dowels and fluttering. So far, I've had five flights on this thing. Overall, I can say its a steady flyer, but it can be a handful on windy days.

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< Message edited by SkillnotLuck -- 4/5/2004 6:53:45 PM >

(in reply to Zipperneck)
       Post #: 13

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/5/2004 7:42:00 PM   
Zipperneck



Posts: 160
Joined: 9/15/2003
From: Plan de la Tour, FRANCE
Status: offline 		Thanks for your input Skill...

The P-40 that I have is camo. Did you recover yours or did it come all green? Also, what engine/prop do you have on it? Retracts?

I plan on installing a brand new OS 61 FX (Tower has dropped the price to $144,99), inverted if need be + easy glow, and a slimline muffler.

Zipperneck

(in reply to SkillnotLuck)
       Post #: 14

RE: Kyosho P-40/AT-6 + OS 61FX !!! - 4/5/2004 10:36:18 PM   
SkillnotLuck


 

Posts: 69
Joined: 10/11/2003
From: Marietta, GA, USA
Status: offline 		Zip,

Yes, I re-covered the plane. The camo covering looks nice out of the box, but once its out in the sun, it WILL sag. Even after you re shrink it. It also punctures very easily. I used monokote olive drab and dove grey and sprayed it with lustercote flat clear. I got the stars from Major Decals. I'm still looking for U.S. ARMY for the bottom. I'm using O.S. 46 FX with an 11x7 prop. Anything bigger will be overkill. The plane screams at half throttle. Thats about where I keep it most of the time. The cowl space is tight. I'm not sure a slimline will work. Cooling is another problem. Notice in the picture a very large opening in the bottom of the cowl. That seems to help a lot. The retracts are Hobbico. They do well for the price. I had to modify them, but so far they've held up well on some less than perfect landings. I had to pull the struts out and file the tops down a bit. Before, when I tightned the linkage to get the "slop" out, the gear would bind during retraction. Now I fly slop free. It also helps on ground handling. One more thing, use nylon bell cranks. The ones the came with the plane will bend and break. Hope this helps.

Mike

(in reply to Zipperneck)