RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND FASTER!  
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All Forums >> RC Airplanes >> Extreme Speed Prop Planes >> RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND FASTER!
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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER,... - 3/5/2008 6:09:42 AM   
Pete328


 

Posts: 19
Joined: 1/10/2006
From: Aurora, IL, USA
Status: offline 		the wiggle im talking about is a matter of 2 to 3 millimeters though i didnt think it was excessive, but plz tell me if im wrong. i did upgrade the pushrod and control horn and still wiggles the same.

(in reply to phjoker)
       Post #: 201

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER,... - 3/5/2008 12:34:14 PM   
TXKflier


 

Posts: 64
Joined: 1/24/2006
From: Texarkana, TX, USA
Status: offline 		My stabs have maybe a 1/16" of wiggle in them at neutral. I haven't noticed any flutter; however, I balanced my stabs using a Dubro prop balancer. I used Z bends at the servo wheel and ball links on the aluminum arms.

How about posting a photo of your radio compartment so we can see how you set it up?

Lynn


(in reply to Pete328)
       Post #: 202

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/5/2008 2:18:00 PM   
Pete328


 

Posts: 19
Joined: 1/10/2006
From: Aurora, IL, USA
Status: offline 		I will get a photo tommrow due to my camera being at work. but to explain as best as i can i have z bends at the servo arm and metal clevises at the aluminum control horn. when i wiggle the elevator i can see that the play is where the zbend is and the servo arm also moves ever so slightly. i was thinking maybe i should get a larger circumference control rod what do you guys think? by the way txk my wiggle in the elevator is about the same as yours then. Maybe im over thinking this i get this way every spring with a model that i have not flown yet. i always have a fear that i didnt build something right and catastrophic failure is impending (esepecially when this much money is into this thing!). So far in the 6 years i have been doing this i have only crashed one plane on maiden due to builder error. anyway I ramble. If i dont get the pic up right away the elevator control is set up exactly like the picture in the instruction manual. Thanks for listening.

(in reply to TXKflier)
       Post #: 203

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/5/2008 2:33:52 PM   
Pete328


 

Posts: 19
Joined: 1/10/2006
From: Aurora, IL, USA
Status: offline 		I was thinking outside of the box too what about making the alerons into elevons for a backup?

(in reply to Pete328)
       Post #: 204

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/5/2008 4:25:07 PM   
Pete328


 

Posts: 19
Joined: 1/10/2006
From: Aurora, IL, USA
Status: offline 		OK guys i got the play out of the elevators to less then 1/16th of an inch by just making the hole smaller in the servo arm. I also noticed the control horn pin is smaller than the hole in the aluminum peice and that is where the remainder of the play is. I will have to keep an eye on it after a few flights to make sure it doesnt get worse. i like the ball control horn idea that looks sturdy. anyone else use that setup or if you use the way i did it let me know thanks.

(in reply to Pete328)
       Post #: 205

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/5/2008 11:34:34 PM   
TXKflier


 

Posts: 64
Joined: 1/24/2006
From: Texarkana, TX, USA
Status: offline 		Back before FM radios came along, it was absolutely necessary to avoid metal-to-metal contact in control linkages. The RFI from the metal parts rubbing together would kill an AM radio. Today's FM radios ignore AM noise, but I see no reason to purposely give your receiver extra work to do. So, I still avoid metal-to-metal linkages.

Put some ball links on those aluminum horns and use nylon lock nuts on the screws. Remember that anything that -can- come loose, -will-.

Lynn

BTW - You need to teach us how to make a hole smaller.

< Message edited by TXKflier -- 3/5/2008 11:36:47 PM >

(in reply to Pete328)
       Post #: 206

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/6/2008 2:14:09 AM   
jlsmith54


 

Posts: 21
Joined: 2/20/2005
From: Alamo, TN, USA
Status: offline 		I just finished up the F-18 this past Sat. for a good friend of mine. I will have to say this is a beautiful plane. I did take some extra time in the building. The plane is of great quality. I did detail it the best I could. I will have to get one in the future, right now I am waiting on TF P-51 HURRY HOME HONEY. I would like to thank everyone on their comments, they were very helpful. I hope the plane flies as good as it looks. I will let everyone know when Gary takes off in the WILD BLUE YONDER with his F-18 Blue Angel. I hope everyone flies their F-18 for a long time.

(in reply to TXKflier)
       Post #: 207

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/6/2008 4:46:01 AM   
Airnondas


 

Posts: 160
Joined: 11/19/2002
From: Laval, QC, CANADA
Status: offline 		Attention all Blue Angel owners

Thanks to GotrekGurnisson on RC Groups;

He has posted on the website pdf files of many jet decals, including the Blue Angels.


You can download and print that nice Blue Angle logo that this plane is missing along with a few others

If you have white in your decal, you have to print on a white label, then stick a piece of clear label on top to protect the colors, peel of the white label covering and stick on. For the clear decal like the hornet, I print straight on the clear label then stick another clear over it, peel and stick. Very easy..

Here is the link.

http://www.rcgroups.com/forums/member.php?u=89637


______________________

Airnondas.

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< Message edited by Airnondas -- 3/7/2008 5:52:09 PM >

(in reply to jlsmith54)
       Post #: 208

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/9/2008 11:07:18 PM   
Sniper.308


 

Posts: 72
Joined: 6/13/2007
From: Lakeland, FL, USA
Status: offline 		I flew my 18 today and changed the prop to 11x7 APC and was really surprised that on my Jett .90L that I'm only getting about 13,500rpm on the ground. It could be my fuel, I'm using Cool Max 15% Heli fuel. It's the only fuel I have because I mostly have Saito 100's and I like the extra lube factor. Do you think that the extra oil that heli fuel has in it that it's creating to much compression and not enough rpm's? Another problem that I am having is when the plane comes to the table I notice that it's sprayed all around the motor with fuel. I'm pretty darn sure it's coming out of the carb's mouth. Also I guess my tune is off cause I went to bring it in for a landing on the last flight and the motor was just hanging on a high idle and I brought it in hot and bounced it a few times like and idiot and broke the front wire gear just on top of the coil. That was weird, I'm just glad it stopped before the fence.......by 20 feet. EEEK! Other than that it flew like a dream. Full throttle just screams like a turrrrrrrrr ducted fan..........
Signed,
What the hell.

(in reply to Airnondas)
       Post #: 209

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/10/2008 3:30:45 AM   
xphstos


 

Posts: 11
Joined: 4/14/2007
From: BELLMORE, NY, USA
Status: offline 		AIRNONDAS WHERE DID YOU GET THE WHEELS FOR THE F18......

(in reply to Airnondas)
       Post #: 210

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/10/2008 6:47:13 PM   
bob27s



Posts: 4637
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		An 11x7 should easily be turning closer to 15,000 ground peak rpm on a 90L engine. Something is wrong if its not breaking 14K rpm.

Launching rich is ok... but it sounds like something is not quite right.

I recommend putting the engine back on the test stand to check it and sort out if there is an issue.
You should have recorded a baseline rpm from the run-in period. If you are seeing rpm down from that, time to find out what changed.
(If you did not perform the run-in as per instructions, do that now before flying or attempting to run in in the airframe).

Fuel being used is not the problem. The 15% heli fuel and extra oil is fine.
Fuel spraying the carb and the engine running low on rpm indicates a possible exhaust restriction, or the engine is just a whole bunch on the rich side and struggling to get on the muffler.

If you are using a diverter, remove that to for bench tests.

Remider - Did you check the cylinder head bolts (retighten) after you performed the initial break in period ?
Remove the muffler, look in the exhaust, and make sure the liner exhaust ports are centered (left to right) in the crankcase opening.

PM me later on after you take a look.

Bob


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to Sniper.308)
       Post #: 211

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/11/2008 2:21:27 AM   
Sniper.308


 

Posts: 72
Joined: 6/13/2007
From: Lakeland, FL, USA
Status: offline 		Well my engine did not come with any paperwork, bought new from a HS in Orlando. Figures, second nitro motor I've bought from them and something was missing. Anyway, I usually break my engines in, in the air. I'm guessing for this motor yhat's not the way to do it. Anyway, all of the head bolts are nise and snug. Have not checked the sleeve or the ehaust for blockage yet. May do that tomorrow morning. Could it be the glow plug at all maybe? I'm using an OS #8. Does this motor need special plugs? If so where can I get them?
Jason

By the way, what is the size of the wire for the landing gear? I sheared the front one off.

< Message edited by Sniper.308 -- 3/11/2008 2:24:13 AM >

(in reply to bob27s)
       Post #: 212

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/11/2008 3:22:32 PM   
Airnondas


 

Posts: 160
Joined: 11/19/2002
From: Laval, QC, CANADA
Status: offline 		Hi



I called GREAT NORTHERN MODELS spoke with Ed, great service, two days later the wheels arrived.

Trim wheels.

They are great.

Here is the link.

http://s43500.sites99.storefront-hosting.com/default.aspx

_______________________________________

Airnondas



< Message edited by Airnondas -- 3/11/2008 3:24:34 PM >

(in reply to xphstos)
       Post #: 213

RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER... - 3/11/2008 8:50:08 PM   
bob27s



Posts: 4637
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline