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 F16 Maiden Flight

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Old 03-10-2006, 02:15 AM
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kmtranmd
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Default Cermark F16 Maiden Flight

Finally found time to maiden my Cermark F16 over the weekend. WOWWWWW best described the euphoria from that maiden flight. Plane looked and flew awesome. I had my Jett90 turning APC 11x8 break-in prop spin 14.5K on the ground (500 below peak). That plane hauled butt and screamed with help of air whistles from i4C. Stock mech retracts held up well. Plane is 10 lbs 3 oz dry. Only problem was front nose gear axle keep buckling/turning on grass runway. I'm going to have to drive a pin through that wire strut instead of bolting it on. Also, I could not find spinner adapter that will work on that narrow stock spinner. Had to switch to Tru Turn 2.5" spinner to allow use of my Sullivan starter. Anyone have suggestion of spinner adapter for that narrow spinner???
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Old 03-10-2006, 08:13 AM
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Default RE: Cermark F16 Maiden Flight

Those whistles are pretty cool aren't they.[8D] Not too sure I understood about the spinner but you should be able to turn the rubber cup inside your starter over and it will have a narrow/smaller hole in the backside.
Glad the maiden went well.
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Old 03-10-2006, 11:08 AM
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Default RE: Cermark F16 Maiden Flight

The metal spinner that comes with the plane is really narrow. The deep cone rubber adapter for the Sullivan starter is not narrow enough even. It needs a good grip to crank over that Jett90, well known for super tight piston.
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Old 03-10-2006, 11:12 AM
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Default RE: Cermark F16 Maiden Flight

Sounds like you had a good time out there Congrats on the maiden flight.

Spinner adapter - I belive you are refering to the cup on the electric starter?

There are a couple of after-market starter inserts that I use.

Miller R/C products

http://www2.towerhobbies.com/cgi-bin/wti0093p?&C=PCG&P=

I have a pink one for smaller spinners and spinner nuts, and a blue one for full size spinners. Between the two of those, Im pretty much covered.

Good products.

The photos on tower are somewhat useless - the show the "back" side of these, not the business end for some reason.
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Old 03-10-2006, 11:51 AM
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Default RE: Cermark F16 Maiden Flight

kmtranmd '- Where did you set your CG at(8-1/2" or 9"??
How was it at the CG you used??
Did you have to change any of the listed throws??
I hope to take mine up for the first time this weekend,I`m using a 91FX eng with staock pipe.
Thanks.
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Old 03-10-2006, 12:56 PM
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Default RE: Cermark F16 Maiden Flight

I had the CG at 8.5" per instructinos. It did not fly nose heavy at all. Very fast roll rate with the aileron throw as recommended for hi and low. Needed a bit of up elevator trim in flight. They suggest you set up neutral then add a bit of up trim before maiden flight which would be right on. Take off from grass will be a pain with the stock nosegear. I'm not sure if your OS 91 has enough power for grass takeoff. It's a pretty big airframe to pull around.
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Old 03-10-2006, 01:42 PM
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Default RE: Cermark F16 Maiden Flight

Oh boy! Love that comment about the os 91fx, sadly too true! Now if he had a OS 91VRDF, you would be humbled!
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Old 03-10-2006, 02:29 PM
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Default RE: Cermark F16 Maiden Flight

The OS 91fx will work ok, but it really needs a tuned exhaust for this application. Most of the F-16s have been coming in around 10lbs flying weight.

Do not over-prop the engine. Try a 12x7 or 12x8 for the first few flights. Remeber, its just an over-grown .61. Timing is conservative, but its high enough to get the rpm up a bit.

See how you first flights go. If its clear you need a bit more, consider a Jett-Stream muffler, Ultra-thrust muffler - or a full pipe (best, but not easy to install on the F-16). Really brings the engine to life, and brings the rpm and power band up where its more useful.



This one here is turning an 11x10 prop.
The engine/prop/muffler combination works well in this application.
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Old 03-10-2006, 03:34 PM
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Default RE: Cermark F16 Maiden Flight

Thanks guys for your input on the OS .91FX.
I`m going to see how it pulls it along with the 91FX for the first few flights.
I was planning on starting with a 12x6 prop on the OS, you think I should try a 12x7 first??
If anyone has this F-16 and using a .91FX, how is it on this jet and what prop are you using??
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Old 03-10-2006, 08:15 PM
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Default RE: Cermark F16 Maiden Flight

I agree with using Jettstream muffler for power increase without having to mess with tuning out a pipe. This plane sits low to ground so 12x6 prop was scraping the grass so much I could not take off until I switched to 11x8 apc, and that was on a jett90 motor. Let me know what starter insert you guys found for that narrow red f16 spinner.
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Old 03-10-2006, 08:22 PM
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Default RE: Cermark F16 Maiden Flight

Congrats on the f-16 maiden....[sm=thumbup.gif]

I agree with Bob on the 12-7 for the OS .91....it is just a bored out .60.

FBD.
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