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Post  RknRusty Tue Nov 25, 2014 8:14 pm

Well, not new, but so far only babied and flown safely. Those would be the Magnum and Yak-9. So after fixing the loose stab on the Magnum I was ready to see what the big old thing can really do... or to be more accurate, what I can do with it. Same with the Yak-9. And I had to fix the stab on it too. Yet another crack had appeared in the small filet under one side of the stabilizer, so I worked some CA into it. I think these are just Fox 35 rattle cracks, they're all over the damn thing. But it's still pretty.

The other day while Cribbs was degreasing the Magnum he found the stab to be loose. Disaster waiting to happen. Last night I cut away the Monokote and forced a bunch of epoxy into it and aligned it with the wing, something that had been askew since I got it. This morning it looked like a great fix, so I got the paint pens and touched it up.

Wayne and I got our civilian passes to the fort this morning and took to the field under heavy threatening sky and no wind except a beneficial light breeze. We tinkered with our planes until it looked like we might not get rained on and then we hit the field. I'm sure glad I bought that starter motor because we couldn't flip crank anything all day. He rigged up his Pathfinder with a big Super Tigre and a new Randy Smith NV, I set up the Magnum and the Yak. Got some new looking .018"x65' lines from the late Allen Brickhause's equipment that he left our club, so I felt much better about the Magnum. They're bronze colored. Only the Magnum's leadouts are really looking like a time bomb, and not enough slack to cut and rewrap either. Hoping they'll hang on one more day.

Every flight I've flown in the last few outings with the Yak has proven it to be a stable running solid flyer. My takeoffs have been improving a lot since I realized I was going to get beat by not getting those points. I did the best reverse wingover I have ever done, turning up right on target both times and cutting a clean slice of sky right overhead. Woo!. That actually is one of my somewhat passable maneuvers. I've grown accustomed to the Fox burp, so don't get too excited when it happens any more, though it did inspire me to kind of hit the intersections of my vertical 8 after my outside turns a little angled. I hate that. Because that really is my best most confident maneuver and I want it to be perfect. But the old Yak roared through all the stunts with its wonderful tight lines and authority. Right now, this looks like my plane for the Profile match in May. It takes a little more effort to fly inside loops while outsides are flown on autopilot, so something needs a look. It's hinging a little with UP elevator. I flew them all well enough to get the pattern points... until I realized I had forgotten the OH8s. I remembered after I had re-done a couple of triangles. They're harder for me than they look. I knew better than to do the 8s, because I had only filled it with enough fuel for the pattern... without extra triangles. and of course it cut off in the first outside, but I had plenty of momentum so flipped it and glided in for a not too bouncy landing. Pretty good Yak attack. I flew another one and Wayne flew it once too. That's how I know it's hinging. I am just not in tune like that. I spend too much of my time struggling to notice details like that.

Horns Drums 2001 theme, Enter the Magnum...
Till now 60' lines are the longest I've tried, and the Magnum was rigged with 65'. After an uncoordinated hassle we got the 46FX cranked. Learning to work with a big plane like this is worse than learning to ballroom dance. It cranked for Ron and me right side up, but insisted on being a bitch today. Finally with the electric starter and a prime through the glow plug hole, it lights off. As with the Yak, I've flown it with great reservation before and am quite ready to cut it loose. And so I did. Man what different experience it is to fly a really big plane. Takeoff is amazing, I could fly a foot off the ground if I wanted. It lifts off and climbs as slow as you want. The rules for scoring are to roll no less than 15' and gradually climb to your 5' cruising height finishing the climb over the point the wheels left the ground. Then after the obligatory 2 extra laps(flown between each stunt), fly your 2 scored level laps. And I'm off to the races. Did a terrible reverse wingover because I'm trying to turn it like a 32 ounce plane. It doesn't like that. But on through the pattern I did pretty well. Got real close to the ground once, but forget how. But my bottoms were okay. Variable. Mostly higher than 5' but not terrible, nice hourglass. And my OH8s, still my worst stunt, were more even than usual, a wiggly cloverleaf but no big corrections and it was all over. Complete pattern with no aborts. Well almost. The landing is the last stunt, and pretty much is the opposite of takeoff. In other words, once you start your descent, you better keep going down with no pause or worse, lift, and plant it with the wheels only touching down once. And as I understand it, wing mounted LG make for much smoother landings. This proved to be true. I botched it for Ron the other day, but today I iced it pretty good. The first full pattern of the Magnum is in the bag. Well hot diggitydamn! I think I've got the middle of the bottom third of the pack in Intermmediate PAMPA Stunt locked down!

It finally started sprinkling rain so we rolled them in and wiped them down. It turned out to be a great day flying. I expect a lot of people think the pursuit of the same pattern over and over again is boring and wasting time that could be spent doing something more exciting. I assure you it's not the case for me. I get great satisfaction of trying to make this machine do exactly what I want it to, no matter what mother nature throws at you to be an immense challenge. It starts in the shop, continues at the field and is intensely at work in your head. It's an extreme amount to process and execute and looks so damned easy watching someone else who's good at it do it.

I should mention we had a great time... and Wayne did fly the pathfinder. He flew good. lol!
Rusty

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Post  Cribbs74 Tue Nov 25, 2014 8:28 pm

Rusty,

Pattern flying may be monotonous, but it's a far cry better than not flying at all. For those who have not tried flying pattern, it's extremely challenging and can take a lifetime to perfect.

Glad your day went well, wish I could have been there to see it.

Ron
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Post  RknRusty Tue Nov 25, 2014 8:37 pm

Cribbs74 wrote:Rusty,

Pattern flying may be monotonous, but it's a far cry better than not flying at all. For those who have not tried flying pattern, it's extremely challenging and can take a lifetime to perfect.

Glad your day went well, wish I could have been there to see it.

Ron
Thanks. Wish we had a videographer. I always take the camera but just rarely feel like fooling with it. And when I do, it's like fishing. Boy you shoulda seen the one that... you know the rest.

Oh, I found out last night why the Li'l Satan was coughing out with you and also me at 1/2A Day.. The NV had something stuck in it and it finally clogged it completely. Brake parts cleaner to the rescue.

Rusry

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Post  pkrankow Tue Nov 25, 2014 8:43 pm

Try adjusting that fox a tiny bit more lean and see if it helps the burp. It will be faster at all points though, but it should still 4-2-4.

Of course you can also put a stick in the bypass and it will go away for good they say.

Phil
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Post  RknRusty Tue Nov 25, 2014 10:07 pm

Hi Phil.
I have decided I like it it a tad leaner than most people probably do. Wayne and I talked about that today. and Mr. Zambelli agrees that it's okay running like that. The little burp is mostly in my head, noise more than performance. I'm learning to trust it so I think I'll be over that quick little jitter by the next flight or so.

I had the best run ever today with a wooden Top Flite 10x5. If this were a serious competition plane, I'd be stuffing the bypass... or more likely bolting on an OS. But I can already fly it way better than I could fly the Osprey. I'll keep evaluating it though.

I've been following your Flite Streak thread and am hopeful that you'll really be happy with it. It's such a great plane, in a league of its own.
Rusty

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Post  Cribbs74 Tue Nov 25, 2014 10:50 pm

Many people like a leaner Fox run, Ken being one of them and the Philly Flyers are Fox guys. Mike Tallman of the Wichita Wichihawks started me out on a 4-2, but kept asking me if I wanted it a little quicker.

So, what I showed you during my visit is how I like it. If a leaner run is more your speed then let'r rip!

There is more than one way to skin a cat, or more than one way to tune a Fox. I'm a Fox nut, this is a fact, but I am open minded.

Before you start stuffing trees in the bypass mess around a little and see if you can't cure the burp another way. It sounds like you are already coming to grips with it anyway.

Ron
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Post  RknRusty Wed Nov 26, 2014 1:36 am

Control liners rigging up at Fort Jackson

I really went at it with two new planes today WP_20141125_002_zps4d42b2ee
Looks like I have castor oil on my lens again.

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Post  Ken Cook Wed Nov 26, 2014 5:03 am

I will say this, you have the wide bypass Fox. It will burp a bit more than the newer cased Fox's. I strongly recommend not putting the stick in the bypass. I have a strict rule about taking things apart at the field. I go to fly and not be a mechanic. I can't tell you how many things get lost in the grass doing so. When I did the stick, I couldn't get the damn thing out of the engine fast enough, it was the worst run I ever experienced. This is where I made the exception of taking an engine apart. Mine was in a newer 40th case. Older wide bypass cases are eggshell fragile and will distort if you don't have the fit right. Not only could the case distort (especially with strap mufflers) but the liner can due to the top of the case and or the head not being completely flat once the screws are tightened. I feel tthe  main problem with Fox's is the thin case as this doesn't allow for proper heat transfer. The engine has a very erratic heat transfer and having the wide bypass in my opinion makes this even worse.

When is the burp most apparent? Is it when you do an outside or go inverted? Raise the tank slightly and re try. A 4-2-4 run in a Fox is mythological. If you choose to do so, your going to be picking up parts. It's not going to happen. The plane will have no power in the overhead maneuvers. WHy do we always hear about it, the Fox would sound like that when running. Running a Fox lean will not hurt it and it doesn't need 29% oil to do it. Using the stuffer backplate is most helpful with this engine. The stuffer backplate also assists the engine in it's run in addition to properly holding the rod on the crank pin. The plug itself is a key item. Keep your Fox plugs for breaking in new engines or if you just want to assist in aiding the filling of landfills. The Thunderbolt R/C long is my go to plug due to it's temperature. In addition, I feel the idle bar shields the plug's element against droplets of fuel which can dowse the plug in the outside maneuvers. Having your spraybar orientated correctly is also very important. The Fox utilizes a 2 hole spraybar for those that use the stock unit. De burring those holes is step #1, having the spraybar orientated so that you can't see either holes is quite important. This can hamper the lean break when the nose is pointed up if not properly installed. Not really an issue with Tiger needles.

         Rusty, are you using a Thunderbolt R/C plug? Many feel that if the plug works, it's fine. Well I can tell you it's not and while others work, they don't work as well as this plug does. All Fox's aren't created equal and while some burp badly, others never miss a beat. It's a matter of trying many. In addition to getting rid of the Fox burp, mount the engine in a full bodied plane. The Fox doesn't burp in a upright or inverted manner. The Fox also makes more power when mounted in either or fashion over sidewinder. Running the engine leaner will also not make the burp obvious. Small planes like the Yak like speed. In fact they demand it due to the horrific airfoil. While the 10x5 is one of my choices for the Fox, it's not one I would use on a Yak. A 9x6 running in a wet two would certainly rid you of your burping and it would get the needed rpm's up. However, this won't yield a stunt run as the plane will certainly be going faster.
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Post  RknRusty Wed Nov 26, 2014 11:03 am

Ken, thanks for the helpful input. I can better answer some after I fly next time with your comments and questions in mind. This is one example of when I would take the time to get a video, so next time I will.

I am using an RC long plug with an idle bar, however I do not know the brand. Wayne gave it to me after the first time we flew the plane last spring when we had it cutting off in loops. But that was also a different fuel tank and prop. I'll take a picture of the plug for you to look at. If I know Wayne, it probably came from Brodak.

I can say this for sure. I had been flying with the APC 9x6 and it was pretty good but frequently leaner than I intended, even after launching pretty rich and leaning out very soon. On an impulse of curiosity I put an APC 10x5 on it and immediately liked everything about how the plane handled better. And the beginning to end engine run was more consistent, though still leaning as it went, but just not so soon. And more of a wakeup call before shutting off. Since I couldn't use a spinner with the APC, I put a Zinger 10x5 on it and liked it just the same. I can't compare those two in stunts so much because it was only yesterday with the Zinger that I was putting it through all the ropes. The only difference between the APC and Zinger I'm sure of is that it's more rock solid in the flat laps. If I were being scored, I would score higher in level flight in both directions with the Zinger. TF doesn't make a 10x5 as far as I can tell. That's my brand of 10x4 I like on the 35fp and 9x4 on the 25fp

I keep writing about when it burps and then questioning my memory and deleting what I wrote, so let's wait till I get that video.

Sorry for my inept analysis, but that's better than confusing the issue.
Rusty

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