Author Topic: More Pat Johnston Warbirds (Read 4197 times)

Jim Oliver · « **on:** December 19, 2010, 03:00:32 PM »

It only took about 2 years longer than North American to get it built, but here it is........
Pat Johnston's profile P51 in Israeli desert camo from 1948 era.

Jim Oliver · « **Reply #1 on:** December 19, 2010, 03:01:49 PM »

My files are too big for multiple pics....sorry.

Jim Oliver · « **Reply #2 on:** December 19, 2010, 03:03:59 PM »

More.......

Jim Oliver · « **Reply #3 on:** December 19, 2010, 03:04:54 PM »

Another...

Jim Oliver · « **Reply #4 on:** December 19, 2010, 03:05:25 PM »

Last one......

PJ Rowland · « **Reply #5 on:** December 19, 2010, 03:45:52 PM »

Looking good

Pat Johnston · « **Reply #6 on:** December 19, 2010, 04:13:29 PM »

Jim,
That looks Wonderful. Thanks for the usdate and the first one I have seen built. Nice to see it in the Isreali colors. Refreshing change up from the usual. My original Mustang is an incredible flyer, perhaps my favorite.
What are the spec's on your Mustang? Engine, weight, etc? I set up an LA46 last month with a .257" venturi off an LA25 and a ST NVA. Swung an APC 11.5 X 4W prop in a crackling 4-2-4 break on level flight, giving an immediate 2-cycle run in the maneuvers and dropping back to the level flight setting at the end of the maneuver. This setup felt like it didn't vary 10 RPM from the beginning of the flight to the end. All this at 2 1/2 ounces of fuel. Get that. 40 sized power on steroids with 20 sized fuel consumption. Clean up was easier, too. Try that out if you have a chance.
Pat Johnston
Airframe and Engine Design
Skunk Works

wwwarbird · « **Reply #7 on:** December 19, 2010, 04:44:27 PM »

Looks great Jim, nice to see a different scheme on a Mustang. I'm just curious, what was it that made you settle on the Israeli scheme?

Steve Helmick · « **Reply #8 on:** December 19, 2010, 05:11:22 PM »

I like it! Betcha it's going to fly like a champ. Take your time and get it trimmed out before you get too frisky with it.

Steve

Randy Powell · « **Reply #9 on:** December 19, 2010, 06:52:16 PM »

Personally, I liked Pat's 60 sized Warhawk the best. Very nice flying plane.

John KruziK · « **Reply #10 on:** December 19, 2010, 07:11:42 PM »

It looks like it was worth the time it took to build, nice.

Jim Oliver · « **Reply #11 on:** December 19, 2010, 07:51:58 PM »

OS 46LA-S, APC 12.25x3.75 planned for first flights. It's a bit heavy at ~54 ounces as it sits. TruTurn P51 spinner with light weight back plate option. No ballast yet---CG came out very close with the heavy APC prop and tube muffler. I have a Majic 12x4.5 that I may try, as well as several other props to try.

THe LA 46 has the stock CL venturi with a current ST 51 NVA. I usually need just under 5 oz. 10/22 for the pattern with my other LA 46. We are at ~250 msl; would like to get by with 3 oz. but don't think I can ever do that!

I wanted a camo scheme for the model (first camo I have ever done). I couldn't find a US marked D model with camo; lots of foreign marked camo D's. I thought the sand and shadow desert camo would be easier to see in flight and since I had never seen this scheme used before, I thought it would be a good choice. All the markings are masked and painted------didn't even try to find decals.

Pat, I have your plans for the big Bearcat and big Hellcat, too. Has anyone built the Hellcat yet?

Cheers,
Jim

Robert Zambelli · « **Reply #12 on:** December 19, 2010, 08:12:46 PM »

If Pat designed it, it's sure to be a winner.

I evaluated the prototype P-40 ARC and had to send a few changes to China. Their errors, not Pat's.
To this date, I still have it and it's the best profile I've ever flown.

Bob Z.

Bill Little · « **Reply #13 on:** December 19, 2010, 09:51:31 PM »

Looks sweet, Jim! I like it a lot.

Geez. my favorite fighter and it's one of Pat's so a double winner.

I am getting ready to do one of Pat's Warbirds. Don't want to say which one yet, I'd jinx it, but it ain't the P-51! LOL!!!! But I will say it is a design Pat did for me for a ST G.51 and I am just no getting to it. Trying to finish up what's on the bench so I can dedicate the proper time to it.

Douglas Ames · « **Reply #14 on:** December 19, 2010, 11:48:08 PM »

Quote from: wwwarbird on December 19, 2010, 04:44:27 PM

Looks great Jim, nice to see a different scheme on a Mustang. I'm just curious, what was it that made you settle on the Israeli scheme?

The IAF racked up an admirable record with Mustang in the 50's, many times tangling with Arab JET Fighters.

Pat Johnston · « **Reply #15 on:** December 20, 2010, 06:35:12 AM »

Bill,
I'm looking forward to seeing your new project develop. So as not to give it away, all I can say is those danged Zeros better be careful! I feel like yours may be one of the very best designs of the whole batch.
Pat Johnston
Skunk Works

Jim Oliver · « **Reply #16 on:** December 20, 2010, 06:39:54 AM »

I know it hard to believe, but this is the only Mustang I've ever finished---started the Jetco kit many years ago, but never finished it.

Jim

wwwarbird · « **Reply #17 on:** December 20, 2010, 10:27:02 AM »

Quote from: Pat Johnston on December 20, 2010, 06:35:12 AM

Bill,
I'm looking forward to seeing your new project develop. So as not to give it away, all I can say is those danged Zeros better be careful! I feel like yours may be one of the very best designs of the whole batch.
Pat Johnston
Skunk Works

Hmmm, must be a Navy plane. Within a few days here, I'll be ready to start putting color on my Zero.

Jim Oliver · « **Reply #18 on:** December 20, 2010, 03:49:06 PM »

One short flight; wings level , stable upright and inverted. Gotta de-sensitize the elevator just a bit, inside rounds too tight, but no indication of stall. Didn't do outsides---next time!

5.2 lap times on the 12.25x3.75 with good tension; good glide---don't think the extra weight will be a problem.

So far very happy! Thanks Pat!

Cheers,
Jim

Pat Johnston · « **Reply #19 on:** December 20, 2010, 06:03:09 PM »

Jim,
You might try the stock muffler which is a little heavier than the tube version you have. That will slow down the turn rate a little. The other very equal or better option is to narrow the line spacing on the handle. If the plane is not doing anything ungraceful other than a too quick turn rate, then it may simply have too quick of control. Line spacing is my usual first step if the CG is close. I usually end up with a line spacing of around 2.5 to 3.25 inches. Close down the spacing until the square legs exit nice and flat with ease. That is a good rule of thumb on the correct sensitivity.
Pat Johnston
Trimming and Balance
Skunk Works

Brett Buck · « **Reply #20 on:** December 20, 2010, 07:37:55 PM »

Quote from: Pat Johnston on December 20, 2010, 06:03:09 PM

You might try the stock muffler which is a little heavier than the tube version you have. That will slow down the turn rate a little. The other very equal or better option is to narrow the line spacing on the handle. If the plane is not doing anything ungraceful other than a too quick turn rate, then it may simply have too quick of control.

One good way to tell if it's tail heavy or just too sensitive is to see how it tracks in the round loops - if they tend to wrap up tighter as you go on (and come out high all the time) it's probably tail-heavy. If it tracks properly in the rounds, and either comes out about where you started, or slightly lower, then it's probably just too sensitive.

Brett