Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Cermark F-20 .60-.90size. Heres the "Do-Over."

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Old 08-02-2002, 01:06 AM
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Cyclic Hardover
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

Airgar, heres whats up so far. About 90% done here. All that is really left is the Engine and a few minor things. Recovered in Monokote Charcoal with a white underside. Will be home to a Jett .90
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Old 08-02-2002, 01:09 AM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

Heres the bottom.
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Old 08-02-2002, 01:29 AM
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Razor-RCU
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Default Sweeeet!

That is my next project, as long as they are not sold out!

Did it come with retracts?

Looks bad a** !

Any and all info. on this prop-jet is greatly appreciated...

james
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Old 08-02-2002, 01:56 AM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

www.cermark.com

It comes as an Arf. Red was the original Northrop prototype. I just didn't like it. Comes with a nice set of what appears to be Hobbico clone retracts, aluminum spinner. The rest of the hardware gets chucked in the trash as with most arfs.
*I remember a couple years ago this plane and the F-16 were $335. I bought this a few months ago at $235. I believe they are going for $200 now for what stock is left. You would be an idiot not to get one at this cost. Even if your not ready for it-save it for later.
*Below is the Northrop Prototype.
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Old 08-02-2002, 01:59 AM
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Default Cyclic Hardover

Looks Great...... It's gonna "haul"...with the Jett...

Mines been plagued with flutter problems.....
My two flyin' buds don't have the problem, and theirs are faster than mine...

It seems like the aileron torque rods are weak, and are flexing...
The wing is straight...and strong...finally, out of desperation...I shortened the ails, buy 6", and taped the seams....

On the next one...I'll put dual servos in the wing, and shorten the ails....they don't have to be that long in the first place...

Will find out this weekend if the prob. is cured (better be).

Good Luck...talk later...Dave.
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Old 08-02-2002, 02:00 AM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

"oops!"
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Old 08-02-2002, 02:04 AM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

I have never experienced "flutter" first hand. I have seen the results of it but are there obvious signs? Can you hear it?
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Old 08-02-2002, 02:16 AM
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Default Flutter...

Yes, you can hear it......sometimes it's hard to tell what's "flutterin".....

Alot of times, the plane will break apart before you can slow her down...

If you haven't done so...tape all the seams.....
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Old 08-02-2002, 02:39 AM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

Cyclic,

AWESOME!! That really looks good!! Man, that "ARF" was a little more work than the instructions said, eh??

Your gonna LUV it!! Let us know how the maiden goes.

I am LUVIN' mine!!

Gary

P.S. C'mon buddy, we need a "name"!!
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Old 08-02-2002, 02:43 AM
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Default Handy tips @ only $5.00 ea.

Cyclic....

On the front retract....you have to hold the rod from "riding up".
It has to be kept "low" in that stearing slot in the nose wheel.
If it is allowed to ride-up.....the wheel will twist and jam up in the wheel-bay....when retracting....(low, meaning towards center-line of plane...when working on it )

Also...grind nice "flats" on the struts, and axles...and replace those metric allens with some better screws....( you can't get 'em tight enough to keep the wheels from twisting all the time).

Talk later...Dave.
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Old 08-02-2002, 04:12 PM
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Default More on the nosewheel

Cyclic.....
The nose-wheel will work, when the fuse is up-side down on the bench...but when the plane is right-side up....gravity will alow the linkage to drop down in the steering "slot". (pic below)

When you retract the gear, the wheel will twist going into the gear-bay, and jam...not good...

You have to use a "long" clevace on the steering slot...or else it won't rotate properly, and bind up on the slotted piece...not good...

If you bust the plastic slotted piece...the gear is shot....no parts...not good...

Keep a rag over the canopy at all times in the sun...5 mins., and it's melted...

Dave...
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Old 08-02-2002, 04:58 PM
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Default ALERT..CERMARK F-20...60-SIZE

As of 10:45 HRS...8-2-02...
Cermark has only 7 F-20's in stock...
The sales lady said they have plenty of parts...

At $199., with retracts and spinner...this is no time for "snoozin'"
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Old 08-02-2002, 07:57 PM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

Ats right....don't be snoozin', or you be loosin'!

And for any of you that do decide to pick one up, DO NOT attach elevator servo per the instructions, as it WILL crash from failure.

Gary
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Old 08-02-2002, 08:33 PM
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Default F-20 Lovers....Non-Snoozers !!!

Yo, AirGar....Your plane looks good....

I'm hopin' I can get mine up to speed....

I didn't 'snooze....( they had 9 )
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Old 08-02-2002, 08:38 PM
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Default 9?

They only have 9 left?? :stupid:

I am still collecting cans to save the $$...
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Old 08-02-2002, 08:46 PM
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Default Nope...only 7 left...

I snagged 2 of them...

Throw the "plastic"....
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Old 08-02-2002, 08:51 PM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

I called them - waiting on quote to have shipped to CA.
What's the prop you guys are spinning?
I would most likely put an OS91FX in it and it would need 13x8 or 14x6/8 - is there enough clearance with trike retracts?
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Old 08-02-2002, 09:00 PM
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Default Arfn'around

Nope...12" is all you can fit.....

Airgar runs a 11-7 on a Jett 90... (mucho-revs)

I run a 12-6 on a Tower .75....

Wait a sec...I got just a hair over 1"....on tarmac you might run 13".....not on grass or dirt...I had to put small wheels on the back, and I think I used one of the "mains" on the nosewheel....just to get the 1" clearance.... :stupid:
Dave.
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Old 08-02-2002, 09:31 PM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

I emailed Dub Jett on the best prop for this engine and plane and he told me and 11/8 APC
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Old 08-02-2002, 09:50 PM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

How hard was it to strip off all of the covering? I like these but I can't stand looking at an all red plane in the air.
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Old 08-02-2002, 10:04 PM
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Default maverick

Cyclic stripped his whole plane...
I stripped off about 1/2 the red on top, and did the white...

It came right off with the heat-gun. just a little "dust" sanding to remove some left-over coloring...no problem.

Dave.
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Old 08-02-2002, 10:21 PM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

Cyclic,

I'm running an 11x8 APC, which is what Jett recommended to me too.

In fact, that's the only prop that motor has seen!
I thought about trying a 12x6 APC, but may wait until I'm sure it's broken in.

Gary
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Old 08-03-2002, 12:31 AM
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Default Re: maverick

Originally posted by Flyboy Dave
Cyclic stripped his whole plane...
I stripped off about 1/2 the red on top, and did the white...

It came right off with the heat-gun. just a little "dust" sanding to remove some left-over coloring...no problem.

Dave.

I did it over a weekend. Use a sharp razor blade. You know if you want to keep this color as scale as possible, your going to have to add more white.
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Old 08-03-2002, 01:00 AM
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Default Cermark F-20 .60-.90size. Heres the "Do-Over."

The F-20 is a well built, attractive sim Jet, but does need some attention to details...first, the nose gear works great upside down, but in service it needs repair after every flight,, do not use the factory hook up on the rudder..I finally unhooked the rudder alltogether and sealed it in place..no more fishtailing or flutter....the mickey mouse elevator hookup is an accident waiting to happen...with these changes , it is an impressive flyer...I used a Webra Speed 60 with an 11-9 prop..not ballistic, but impressive...
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Old 08-03-2002, 02:39 AM
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Default eugene

I have been having flutter problems too, but have blamed it on the ailerons. I trimmed the rudder and elevators a bit, and tightened up the rudder for zero play.

Did you see the rudder fluttering on yours ? I have never been able to see what the heck is doing it on mine. It usually flutters when it is moving from my left-to-right....another reason I have blamed the left aileron. We also found a sloppy hinge on the tip-end of the left aileron.

I was going to do away with the rudder, also. At first I thought it was the rudder.... :stupid:

Dave.
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