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

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 6:24:01 AM

509thBoomer

Posts: 133
Joined: 5/2/2005
From: Fairchild AFB, WA, USA
Status: offline

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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Phil
Fairchild AFB WA

(in reply to vasek)

Post #: 51

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/4/2005 4:50:18 PM

Kmot

Posts: 7743
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline

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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DRILL BABY DRILL!!!

(in reply to 509thBoomer)

Post #: 52

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/4/2005 6:56:59 PM

msweeten

Posts: 46
Joined: 5/12/2005
From: Escondido, CA, USA
Status: offline

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?

(in reply to lear31A)

Post #: 53

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/4/2005 11:32:45 PM

lear31A

Posts: 858
Joined: 8/25/2003
From: Hattiesburg, MS, USA
Status: offline

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 -- 7/4/2005 11:34:08 PM >

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Will fly for coffee

(in reply to msweeten)

Post #: 54

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 3:35:34 AM

jetpilotrich

Posts: 276
Joined: 1/9/2004
From: , FL, USA
Status: offline

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

Rich

(in reply to lear31A)

Post #: 55

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 5:03:08 AM

smitty9969

Posts: 85
Joined: 8/10/2004
From: APO, AE, USA
Status: offline

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

(in reply to jetpilotrich)

Post #: 56

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 3:33:44 PM

bob27s

Posts: 4833
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline

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

_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to msweeten)

Post #: 57

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 7:08:11 PM

msweeten

Posts: 46
Joined: 5/12/2005
From: Escondido, CA, USA
Status: offline

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.

(in reply to bob27s)

Post #: 58

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 8:28:10 PM

hattend

Posts: 2055
Joined: 11/29/2001
From: Redding, CA, USA
Status: offline

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

_____________________________

Revver Brother #94

(in reply to msweeten)

Post #: 59

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 8:46:29 PM

lear31A

Posts: 858
Joined: 8/25/2003
From: Hattiesburg, MS, USA
Status: offline

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!

_____________________________

Will fly for coffee

(in reply to bob27s)

Post #: 60

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 9:37:06 PM

bob27s

Posts: 4833
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline

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 -- 7/5/2005 9:41:50 PM >

_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to msweeten)

Post #: 61

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 10:38:59 PM

msweeten

Posts: 46
Joined: 5/12/2005
From: Escondido, CA, USA
Status: offline

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.

(in reply to bob27s)

Post #: 62

RE: THE NEW CERMARK F-16 BUILD IT BETTER, STRONGER, A... - 7/5/2005 10:47:35 PM

hattend

Posts: 2055
Joined: 11/29/2001
From: Redding, CA, USA
Status: offline

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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