NoFlaps

My Feedback: (131)

That's correct, it was originally designed for pattern flying, it is in fact the SP.
That makes me feel much better.

johncronan

hi
can any one offer me any advise? i've got the cermark f-16 prop model, with the standard elevator linkage set-up i was getting 5mm play at the leading edge when the system was running, now i have changed the elevator to seperate servos using direct m3 links and clevis's, this gives me 3mm play at the leading edge of each elevator. should i get any play on the elevator? i am just waiting for this information before test flying! all the bits when held by hand show no signs of play. any suggestions?
many thanks

KC36330

any play would come from slop in the linkages and backlash in the servo, 3mm is IMO too much.

sassy8

My Feedback: (61)

I will agree any play is to much. I ended up with about the same amount in mine, I'm changing it to double ended ball links bolting everything together. Also using digital servos so it will hold center.

k8svrick

I just finished building the Cermark F16. I'd like to get an idea what other builders are getting on finished EMPTY weight. I'm using a Jett 90 with the Jett muffler. The airplane also has a lighting kit from Electro Dynamics which required a 3 oz. battery. Coupled with a 3000 mah rx battery in the back, the CG came out exactly at 7 1/2" back from the leading edge as it should.

All that said, the finished weight is 10 lbs., 15 3/4 oz.; heavier than I thought it would be. Cermark says this plane should be 9 lbs.

What are you guys seeing in the weight department?

Thanks

Rick

kmtranmd

My Feedback: (71)

Anything under 11 pounds is good for this plane. Remember you got a few extra ounces from lighting stuff. 9 lbs is unrealistic for any plane with 91 size motor up front. Mine also has Jett 90 and was clocked at around 130's coming out of a dive. You'll be happy. That engine is pretty loud if you have any noise restrictions at the field.

k8svrick

Thanks for the feedback. I became a bit concerned when I checked the weight spec for the plane at the Cermark website. I think 9 lbs may have been correct at one time for an older version with a .60 and no retracts. The Jett 90 is certainly heavier than any .60, agreed. If Saturday May 2nd is a good weather day, it'll go up to for the initial flight.

stevenchao

Sorry, the 9 pound is unrealistic given that is was done with 60 size glow. You can fly it with a 60/75, but it will be such a dog.

Peace,
Steven Chao,
CERMARK

bob27s

My Feedback: (19)

Maybe just slightly, but you also have to compare apples to apples.

The Jett 90L with jett-stream muffler, plug, and spinner nut - ready to fly - is 26 oz. Engine only is 20oz.

OS 91FX is 24.5oz with muffler , 19.4 naked. (not including spinner nut)

OS61FX is 19.5 naked, and about 24.6oz with muffler

ST G-90 is 26.5 with muffler, and 20.5 naked

Magnum 61XLS is 23oz with muffler (published, but I have not weighed one)

Rossi 60 is about 21oz naked