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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/11/2007 4:37 PM   
CrashPro



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Status: offline 		Hey virtualvictum

Thanks again for the modification ideas...

Did you use the supplied throttle pushrod or use something else?

So far this thing is going together pretty easy....

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/12/2007 5:33 AM   
virtualvictum


 

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Status: offline 		Hey Crash Pro. I went ahead and used the stock throttle pushrod. Yes it is an easy build. Did you have to shim your retracts to get them to fully tuck into the fuse? I needed 2 washers under the rear of the right hand retract and 2 more under the front of the nose gear retract to fully hide into the fuse. The left hand main was fine as is. This required a little longer wood screw for the retracts so I went ahead and installed blind nuts and machine screws. Since the mounts are pretty well accessible it was easy, especially the nose mount. Let me know how yours balances out with the Jett 90. I did not have to add any weight at all to balance. I'm not sure how the Jett 90 compares in weight to the O.S. 91 with Ultrathrust muffler. I do know that the Ultrathrust is considerably lighter in weight to the stock O.S. muffler.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/12/2007 6:35 AM   
CrashPro



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Status: offline 		Hey virtualvictum

I won't know how the retracts are gonna work out until I get the air tank. ( Retract air tank was missing when I opened the box ).. Graves R/C said they expect it the end of this week and they will overnight it to me. Thats great you didn't have to add any weight to balance.
Engine will be mounted tomorrow. Except for the air tank..I think it will be ready to go by this weekend.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/13/2007 11:26 PM   
CrashPro



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Status: offline 		All I need now is the air tank and its ready to go.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/14/2007 7:44 AM   
bob27s



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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/15/2007 7:19 AM   
virtualvictum


 

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Status: offline 		Het Crash, looks real nice just like mine!! LOL. You can cycle the gear withiut the tank just by using a small allen wrench or the like and getting under the retract mechanism and applying small force to start the piston up. This will allow you to dry cycle the retracts before you apply air and see if everything is going to line up properly. Let us know how the maiden goes. Good luck.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/16/2007 2:51 AM   
phjoker



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Status: offline 		what I have also done in the past is hook up a short piece of air hose to each retract and
just used a ball pump to get them to cycle. 1 at a time of course.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/16/2007 3:39 AM   
CrashPro



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Status: offline 		I just fired up the Jett .90 for the first time, and ran a tank thru it as per Dub's instructions....This is my first Jett engine,... I've never even SEEN one before,...and HOLY SHAT!!! ...What a difference between my O.S. and Magnum .90's!! WOW!! It was almost scary.....HA...this thing is gonna rip...

I wish the air tank had shown up this week, I could fly this thing tomorrow if I had an air tank for the retracts. Oh well,....I'll take it to the field tomorrow anyway for show and tell..

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/16/2007 4:10 AM   
jetpilotrich



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Status: offline 		ANYONE OUT THERE WHO MAY NEED A REPLACEMENT CANOPY FOR THEIR VERSION 2 F-16 ... PLEASE CONTACT ME. A FRIEND IS GOING TO MAKE A MOLD OF MINE AND MAKE SOME COPYS.

EVERYONE WHO READS THIS PLEASE FEEL FREE TO POST THIS ON ANY THREADS SO EVERYONE GETS IT.

MY CANOPY IS CRUMBLING AND I KNOW SOME PEOPLE NEED REPLACEMENTS!

SEND ME AN E-MAIL:

JETPILOTRICH@CFL.RR.COM

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/16/2007 4:11 AM   
phjoker



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quote:

ORIGINAL: CrashPro

I just fired up the Jett .90 for the first time, and ran a tank thru it as per Dub's instructions....This is my first Jett engine,... I've never even SEEN one before,...and HOLY SHAT!!! ...What a difference between my O.S. and Magnum .90's!! WOW!! It was almost scary.....HA...this thing is gonna rip...



I bet you will never buy a diffrent 90 sized engine again!


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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/16/2007 4:51 AM   
CrashPro



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quote:

ORIGINAL: phjoker

quote:

ORIGINAL: CrashPro

I just fired up the Jett .90 for the first time, and ran a tank thru it as per Dub's instructions....This is my first Jett engine,... I've never even SEEN one before,...and HOLY SHAT!!! ...What a difference between my O.S. and Magnum .90's!! WOW!! It was almost scary.....HA...this thing is gonna rip...



I bet you will never buy a diffrent 90 sized engine again!





I'll bet you're right phjoker ....HA....I already have my eye on a .60LX too to put on a new retract ready Bobcat.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/17/2007 8:14 PM   
CrashPro



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quote:

ORIGINAL: virtualvictum

Hey Crash Pro. I went ahead and used the stock throttle pushrod. Yes it is an easy build. Did you have to shim your retracts to get them to fully tuck into the fuse? I needed 2 washers under the rear of the right hand retract and 2 more under the front of the nose gear retract to fully hide into the fuse. The left hand main was fine as is. This required a little longer wood screw for the retracts so I went ahead and installed blind nuts and machine screws. Since the mounts are pretty well accessible it was easy, especially the nose mount. Let me know how yours balances out with the Jett 90. I did not have to add any weight at all to balance. I'm not sure how the Jett 90 compares in weight to the O.S. 91 with Ultrathrust muffler. I do know that the Ultrathrust is considerably lighter in weight to the stock O.S. muffler.



I had to shim my retracts exactly the same way to get them to tuck into the fuse. My air cannister shipped friday, so I should get it in the next couple days. I'll probably have one of the more experienced pilots do the maiden flight Sunday, so I can video the flight.
I'll post the video here.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/18/2007 5:27 AM   
virtualvictum


 

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Status: offline 		Sounds great Crash. I flew 7 more flights this Sunday with my F-18 and all went well. The canopy mod worked really well except now the front of the canopy is wobbly. The hatch mechanism is a great idea but there is just too much vibration on the front of my plane. The holes wallowed out. I secured the front the same way I did the back and all is good. I had 4 deadsticks at the field that I troublesot back to loose head bolts. After tightening them up all was well and the last 3 flights were great. What kind of rpm's are you getting out of the Jett Crash and with what prop? I am getting around 12,500 with a 13x8 and the Ultrathrust muffler. I know this because we tacked it with 2 different tachs at the field because we thought it was over revving and thus flaming out. Not the case but it was nice to know what rpms I was getting with this combo. I know I am not lean because I see a nice thin line of blue smoke trailing behind and it idles down real nice. Maybe I can get one of my buddies to make a video and I will post a short vid. Good luck on your maiden this weekend.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/19/2007 3:58 AM   
CrashPro



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Status: offline 		Air cannister showed up today, just need to balance it now.
I noticed Sunday while running the engine that the canopy was loose and vibrating, ( like virtualvictum pointed out) I found a quick and easy way to fix that problem was to just stick a few pieces of wing saddle tape to the fuselage under the canopy. Its now nice and tight, no movement at all.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/19/2007 6:01 AM   
virtualvictum


 

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Status: offline 		That is a great way to fix that canopy Crash, unfourtunately it didn't last long on my jet. I also tried that and thought it was sufficient. Here are pictures of my fix and it solves the problem permanently. You do have to take another 20 or 30 seconds to pop of the canopy this way but it won't vibrate off either. Good luck with the maiden. I can't wait to see the video.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/19/2007 6:26 AM   
CrashPro



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Status: offline 		Thanks for the pictures virtual....I'll probably end up doing the same. I'm going to experiment with a couple different props this weekend and will answer your question about rpm's with the Jett .90.

Will do the balancing and high/low rate settings tomorrow.....can't wait for the weekend..

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/19/2007 5:17 PM   
DougV


 

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Status: online 		Guys,

I had the same issue with my F-16, I just glued a piece of stick behind the holes, it works real good... 25 flights later and holding. On the 90LX I use an 11x8 at 14.9-15K ground RPM.

Thanks,
Doug.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/21/2007 10:04 PM   
bob27s



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quote:

ORIGINAL: virtualvictum

Sounds great Crash. I flew 7 more flights this Sunday with my F-18 and all went well. The canopy mod worked really well except now the front of the canopy is wobbly. The hatch mechanism is a great idea but there is just too much vibration on the front of my plane. The holes wallowed out. I secured the front the same way I did the back and all is good. I had 4 deadsticks at the field that I troublesot back to loose head bolts. After tightening them up all was well and the last 3 flights were great. What kind of rpm's are you getting out of the Jett Crash and with what prop? I am getting around 12,500 with a 13x8 and the Ultrathrust muffler. I know this because we tacked it with 2 different tachs at the field because we thought it was over revving and thus flaming out. Not the case but it was nice to know what rpms I was getting with this combo. I know I am not lean because I see a nice thin line of blue smoke trailing behind and it idles down real nice. Maybe I can get one of my buddies to make a video and I will post a short vid. Good luck on your maiden this weekend.


If you are running an OS/ultrathrust combo... prop it with a 12x8 prop.
Let that sucker turn up well over 13,000

Bob

< Message edited by bob27s -- 9/21/2007 10:07 PM >


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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AN... - 9/22/2007 4:35 AM   
virtualvictum


 

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Status: offline 		Hey Bob, thatnks for the info and I have a 12x8 sitting here for it. What is the max rpm's I can get without hurting the motor? I love the way it flies and I do not want to hurt the engine as they are expensive. Not as expensive as the Jett's but enough for me. Thanks.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AN... - 9/22/2007 5:33 AM   
bob27s



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Status: offline 		You wont really hurt the engine with RPM.... its pretty rugged.

RPM goal on that engine is more due to the porting design and crankshaft flow. The OS is a good engine..... no question about that.

Propping for around 13K to 13.5K groud peak seems to be about right with the tuned exhaust ...... in a speed application. Anything down to about 12,500 as a ground peak is fair game. Up as high as 14K is possible...... but the engine will tend not to unload a great deal in the air.

The 12x8 has proven to work well. 12x9, 11x10, 11x11 worth trying too.


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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AN... - 9/23/2007 4:08 PM   
cutter-nj


 

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Status: offline 		Hi All just like to get some additional information in reference to prop and engines for this plane. I bought the plane from dotdigital
He installed an OS 91 with stock muffler. I flew the plane yesterday; I was turning 12500 with a 12 X 8. The speed of the plane was not impressive, it flew nice and smooth and it was easy to fly but I would like it to go faster. Has anyone her done some charting using using the muffler from JETT or an other tuned pipe. For you guys with the JETT 91 can you tell me what RPM's you are getting with a 12 x 8. I would like to improve my power plant, but don't want o spend money on hype alone.
Thanks

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AN... - 9/24/2007 4:35 AM   
CrashPro



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Status: offline 		Didn't get to maiden today...too windy. Will try to get out there one day this week,...if I can get away from work. Dang, other than the wind,...it was a beutiful day,..clear blue skies. Finally got a break in the heat,...only hit 90 today. I'll post a video of the maiden flight...

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< Message edited by CrashPro -- 9/24/2007 4:37 AM >

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AN... - 9/24/2007 4:37 AM   
virtualvictum


 

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Status: offline 		Thanks for the reply Bob. I will put on the 12x8 and tune for best performance and let her rip!! Cutter, you must ditch the stock muffler on the O.S. and get an Ultrathrust or one of Jett's mufflers. Wakes the O.S. up. I am still waiting to see how CrashPro's maiden went. I hope and trust that all went well.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AN... - 9/24/2007 4:39 AM   
virtualvictum


 

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Status: offline 		OOps, didn't see that post Bob. Well there is always another day to fly. Hope the wind calms down for you soon. It is a real blast to fly.

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RE: CERMARK F-18 HORNET, BUILT IT BETTER, STRONGER, AND... - 9/27/2007 6:55 AM   
TXKflier


 

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Status: offline 		I plan to use this graphic on my Cermark F-18. It's a photo of the real thing that I edited. I changed the blue background to a single color. This will make it easier to change it to match your plane, if needed.

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