Sidewayskiwi
Anyone modified the elevators on the F22V2 to the same config as the SU34 Mig29 V4&5 fleet (no all flying tail planes that dig into the air)
If so was it a success?
Would you recommend it for the F22V2??
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DualDesertEagle
Anyone modified the elevators on the F22V2 to the same config as the SU34 Mig29 V4&5 fleet (no all flying tail planes that dig into the air)
If so was it a success?
Would you recommend it for the F22V2??


Could u visualize what u mean? I can't picture what u mean in my head.
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Sidewayskiwi


Could u visualize what u mean? I can't picture what u mean in my head.

See the pics below 
Most V2 and V3 planes have have the elevators extending forward of the pivot/hinge line 
This has some advantages and some negitives 
The negitives are rapid pitch changes stalling as the extended portion ahead of the hinge line grabs at the airflow 
Dave and scott started going away from this design in the Mig29 V4 and S34 etc
Was wondering if anyone has applied the later thinking on the elevators to the earlier designs ?
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JTiger
I think it's been done; it looks like it would be pretty easy. I'm curious what the advantages are vs the flying tail. The only one I can think of is no danger of snapping off elevons in the grass on landing.
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Sidewayskiwi
Dave explained on the Mig29V4 increases speed less drag and has a desensitizing effect on the controls 
Built F35 &18 with original thrust vectoring style and latest pair without 
both planes fly smoother longer and less likely to stall out with the later style elevators
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DualDesertEagle
Ah, now I see what u mean, but personally I'd always build the elevons as designed, not only for looks but also for the increased moving surface area which makes the plane more agile. Also, I found that the leading edge slats on the F18 V3 combined with 4x4 controls made it alot more stable in high alpha, which can be seen here:
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Sidewayskiwi
got the same F18 made mine out of DTF 
only run two servos in the plane each servo running aileron and an elevon 
The f18 is the second plane i altered the elevator design on (f35 v3 the first) both to me fly better than the first examples of the same planes i built 
Yes high alpha isnt as good as the self servo elevators (some refer to them as mass balanced but thats not quite true ) 
Originally the all flying tailplane designed by the Germans in WW2 to combat compressibility and increase control with swept wings and high speed 
i was continually damaging my elevators and having to repair them then saw the dave and the RCP Mig29v4 with what i call standard elevator configuration so i changed reckon the planes are faster more stable and fly more scale which is ironic as they have the all flying tailplanes on the real things
Maybe when we scale down for RC planes the all flying tailplane is too much of a good thing
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JTiger
@DualDesertEagle What scale is that F-18 v3?
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Sidewayskiwi
standard straight off the plans size
put the V4 leading edge flap on it ----not a fan really draggy but stable in wind --will redo in depron (now new supply arrived) 
and do the standard V3 wing with the weight difference (DTF V DEPRON) 
Feel the need for speed
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lysle42
full moving elevators catch the grass on landing and strip servos if not break the tail. if you fly on super short grass then no problem but flying in cow fields like do the full moving elevators kill my planes.
Homer
<'(((><
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DualDesertEagle
lysle42 wrote:
full moving elevators catch the grass on landing and strip servos if not break the tail. if you fly on super short grass then no problem but flying in cow fields like do the full moving elevators kill my planes.


That should actually only be a problem if u pull up too hard on touchdown, that's when it happened to my F-18 too once.

But having learned to never pull up too hard near the ground it never happened to me again, no matter how tall the grass was.
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JTiger
lysle42 wrote:
full moving elevators catch the grass on landing and strip servos if not break the tail. if you fly on super short grass then no problem but flying in cow fields like do the full moving elevators kill my planes.


I'm pretty careful when landing so I've only broken one or two elevators, even I long grass. I did split S my FT Edge into the ground a few months ago and (besides cracking the nose in) I did rip the elevator off like that. It's not a flying stabilizer like our parkjets but there was enough of the elevator forward of the hinge line to catch the ground and rip up the elevator as I was pulling up 😕
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