RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, AND FASTER!!!

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, AN... - 7/4/2005 9:24 AM

509thBoomer

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Howdy ya, I have been TDY for a while, but am back now and flew the F-16 again today. The jet seems to get faster and faster every flight! There is nothing like flying 10 ft off the deck at 130+ and pulling straight up into a series of almost unlimited vertical rolls to a split s. All I am missing is the smoke system and the official Thunderbird narriator. The Magnum .91 has been a great engine! Here are a few pics from today, The little F-16 is the Ultra Fly Electric with a brushless 370 and a 1900 Mah Lipo Battery, it is no slouch either! I have a great fast flyby video, just not to sure how to post it, any ideas? Enjoy!

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/4/2005 7:50 PM

Kmot

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Boomer, you can post your vids at www.rcpics.net Max size limit is 16MB.

If you can, make the video a "streaming video" when you produce it and it makes a smaller MB size for the internet

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/4/2005 9:56 PM

msweeten

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I made another flight with the CG a tad past 8 inches. The plane flew great!! Very stable, Take off was long but perdictable and smoth, I was having a great time and setteling in to having some fun when the unexpected happened. My Jett 90L started to falter. I quickly started to lose power and had no throttle response. I quickly lowered the gear and made a emergency landing. I ran out of runway and ended up in the weeds. I crunched one of the Missile rails and one of the main landing gear mounts. (I fixed both with relative ease) I removed both rails and replaced the ply gear mount. The biger issue was my Jett 90. Why did it fail? As soon as I looked the the engine I noticed the Glow plug was lose. The engine had burned fuel all over it. I replaced the plug with a Thunderbolt Hevy Duty plug and thought that was that. No go. The Engine just does not want to run now. I can get it to sputer and run for a while but just slowly loads up and dies

The engine has compreshion. Does any one have any thoughts?

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 2:32 AM

lear31A

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Sure glad to hear the plane is ok. I was taxing to the runway and my engine backfired very lowdly. Sounded like a backfire, when I walked to the airplane the glowplug had blown across the runway. Evidentally, I did not check the tightness well enough after several flights. Anyway, it started right back up and ran great. I had a hard landing as well after running out of fuel and the gear rails are still tight as can be. The airplane will fall apart around my gear rails before they fail since I put carbon fiber on them. They are extremely rigid. I highly recommend it. You can see some pics of them in my gallery. I have no idea why your engine will not run. Maybe someone with the higher end engine experience will ring in. Good luck

Boomer: What prop you using? Glad your back!

< Message edited by lear31A -- 7/5/2005 2:34 AM >

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 6:35 AM

jetpilotrich

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Call Dub Jett.... he willsove the problem.

Rich

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 8:03 AM

smitty9969

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If the engine had burned fuel on it, check the head for looseness.. Also Jett's have a removeable glow plug insert. That also could be loose.. If it's a .90 make sure your not running it too lean also. I did that and had a problem with starting also..

smitty *89

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 6:33 PM

bob27s

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quote:

ORIGINAL: msweeten

I made another flight with the CG a tad past 8 inches. The plane flew great!! Very stable, Take off was long but perdictable and smoth, I was having a great time and setteling in to having some fun when the unexpected happened. My Jett 90L started to falter. I quickly started to lose power and had no throttle response. I quickly lowered the gear and made a emergency landing. I ran out of runway and ended up in the weeds. I crunched one of the Missile rails and one of the main landing gear mounts. (I fixed both with relative ease) I removed both rails and replaced the ply gear mount. The biger issue was my Jett 90. Why did it fail? As soon as I looked the the engine I noticed the Glow plug was lose. The engine had burned fuel all over it. I replaced the plug with a Thunderbolt Hevy Duty plug and thought that was that. No go. The Engine just does not want to run now. I can get it to sputer and run for a while but just slowly loads up and dies The engine has compreshion. Does any one have any thoughts?

If the plug came loose, the engine got hot. If the engine got hot, the head bolts probably came loose. Then when you replaced the glow plug, the head button/sleeve probably turned inside of the crankcase. (it has been known to happen). That will make the engine run like its spitting/coughing/cant breath.

Remove the muffler, look at the exhaust port alignment. Id be willing to bet that is the problem. Alignment is fairly easy to correct on your end.

If not, get back to me here, or call Dub.

Bob

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 10:08 PM

msweeten

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I took a look at the mufler port and sure enough the sleve had moved. I loosened the head and moved it back. sinched the head back and now she runs again. I don't know why the 90 would get hot(run lean) that way. I am very carfull not to run too lean. Infact when I started the flight It might have been a little rich, Lots of smoke. I had been trying different props to get the noise down. I wonder if that was enough to over heat it? The head must have been loose before my last filight with the sleve turning in flight? Any way I am going to stick to 12 x 6 and 12 x 7 props and check the head bolts from time to time. The engine now has a 12x7 turning about 13,400 rpm on the ground. That should be Ok. Thanks for the help Dub.

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 11:28 PM

hattend

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It went lean when the glowplug/head bolts loosened up. It was sucking air in through those leaks.

Just check everything over before flight and make sure it's all tight and it shouldn't happen again.

Don

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 11:46 PM

lear31A

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Man, this JETT company really is active in these forums. That was a quick answer! It really makes me want to try out a Jett90. My wife is having a yard sale this weekend with some other foo-foo soccor moms, maybe I can sneak in my lawn mower and drum up some cash to get a Jett motor. We'll see!

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/6/2005 12:37 AM

bob27s

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quote:

ORIGINAL: msweeten

I took a look at the mufler port and sure enough the sleve had moved. I loosened the head and moved it back. sinched the head back and now she runs again. I don't know why the 90 would get hot(run lean) that way. I am very carfull not to run too lean. Infact when I started the flight It might have been a little rich, Lots of smoke. I had been trying different props to get the noise down. I wonder if that was enough to over heat it? The head must have been loose before my last filight with the sleve turning in flight? Any way I am going to stick to 12 x 6 and 12 x 7 props and check the head bolts from time to time. The engine now has a 12x7 turning about 13,400 rpm on the ground. That should be Ok. Thanks for the help Dub.

Msweeten,

Put a smaller prop on it for a bit (break-in size prop - 11x6 or similar). Put a full tank of fuel through it that way, and get the rpm up over 14.5K with it still a tad rich. It will help it get the fit back. Then put your 12x6 or 12x7 back on.

In general, you want to set the engine about 500 rpm down below ground peak rpm for flight. In the air, as the engine unloads, it needs the fuel. Do not confuse exhaust smoke for a 'rich' condition - just means there is a lot of oil, and some unburnt fuel - the engine can still get hot if overloaded. Never run the engine at peak rpm for an extend period on the ground. Find peak, quickly back off a bit. Once set, you should only require tiny tweeks to the needle from day to day. The only way you can hurt the engine is to run it lean for a while.

The engine and muffler are somewhat RPM dependant. If you have the standard Jett-Stream 90 muffler, it is tuned for 'above' 12,800 rpm. If you find a peak rpm at 13,000 or under with any prop you try, you have too much prop. Noise abatement can be a tricky thing, but there is a balance needed with the engine. Just as a suggestion, try an 11x9 prop on the F-16. Will extend the take-off roll a bit, but the lower tip speed may help you.

Bob

< Message edited by bob27s -- 7/6/2005 12:41 AM >

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/6/2005 1:38 AM

msweeten

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On my F-16 I first put on the missle rails. After a small mishap I smashed one so I removed the other one to match. how will this effect the flight charracteristics? Also the belly fins don't seem to have a great way to attach. Cermark says just CA them in place. I did this but seemed flimsy. After one flight they were both loose. Does any one have any thoughts on a better way to mount them? Do they help stability or just create drag? They look scale so I will probably put them back on.

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/6/2005 1:47 AM

hattend

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The missile rails can be left off. You can probably get away with leaving the belly fins off as well. If you're worried about them getting ripped off, make up a ply set the same size and shape, glue some 1/4" backing strips inside the fuse and then glue the new fins on with dowels going up into the backing strips.

Don

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/6/2005 3:01 AM

taildragger21

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I hopefully have this kit on the way!!!! Cant wait to get it flying!!! Are there any mods,or precautions besides whats been listed that should be done?? I will keep you guys posted..

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/6/2005 7:48 AM

lear31A

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I flew mine again today and experimented with the flaperons. WOW, what a difference on landing. I must have made 20 touch and go's. Also, with the flaps down approx. 10 degrees, it rotates and climbs remarkable. I highly recommend using flaperons. It will rotate in about 1/4 less runway than not using them. This airplane gets cooler and cooler every flight. I need a landing light, it gets really tricky to see once below the treeline on approach. Once it settles in nose high, you can see a nice front profile but man it is hard to see if the wings are banking. I can tell I will enjoy this one at least 2 more weeks!

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/6/2005 4:12 PM

bob27s

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Sure sounds like ya are having fun Lear

Some good reports coming in from all over on this bird. Seems to be a winner.

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/10/2005 1:35 AM

Jim Flannigan

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After reading this thread I broke down and bought one of the F-16 with the upgraded retracts.

Hey Bob, I will be giving you guys a call next week!

Thanks to who ever started this thread

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, AN... - 7/12/2005 4:41 AM

jetpilotrich

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Jim... Where did you get the thunderbirds stickers for the vertical stab and the side of the intakes?

Rich

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, AN... - 7/12/2005 6:00 AM

509thBoomer

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I am not sure where Jim got his, but I went to the USAF Thunderbird website and downloaded pics. I then photochopped and resized them. I printed them on waterslide decal paper, cleared it a few times and wa-laa......... Water slide decals. I even made my name on the side.

Phil

< Message edited by 509thBoomer -- 7/12/2005 6:19 AM >

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/12/2005 7:27 AM

BRYAN01601

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I have noticed that alot of pictures are guys flying off of paved runways. How is this on grass. Also would you recomnd this as a first jet type airplane. Been flying 12+ years mostly giant scale aerobatics?

Thanks for your help

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/12/2005 7:53 AM

509thBoomer

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I have never flow a turbine but have flown a ducted fan F-16 and this is almost as close as you can get (minus the lag). IMO this could be a first "jet" airplane as long as you set the CG up correctly.

< Message edited by 509thBoomer -- 7/14/2005 8:04 AM >

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, AN... - 7/14/2005 7:19 AM

jetpilotrich

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thanks for the info,

I intended the message for you... I just got the name wrong.... going to post my single servo landing gear solution soon.... it is working perfectly thus far... hopefully this weekend I can get the post up!

Rich

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, AN... - 7/16/2005 8:05 PM

jetpilotrich

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Here are some first pics of the main gear single servo setup... had to think outside the box on this one (or outside the servo tray)... my friend RONAIR and I worked on this one!! I I still have to hook up the nose gear but the mains work perfectly!

Notice the shims on the gear mounting plates... gear plates were crooked... in addition many of the factory installed bulkheads are not properly lined up. and some tweaking has to be done!

Rich

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/16/2005 11:40 PM

Razor-RCU

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13.4 on the Jett-90 seems low.... I have a souped up Rossi-60 that turns a 12x7 APC right @ 13.4K

Although if you are trying to keep the noise down I would use whatever works within reason---

Bob- Shouldn't the Jett-90 turn more than 13.4 there?

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RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, AN... - 7/17/2005 3:33 AM

Edgar Perez

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Clever

...

I usually try to avoid the easy connectors, as they may slip... however a lot of people are happy with them...

Good luck,
Edgar

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