Fair Dinkum .

[M Spencer]

https://ntrs.nasa.gov/api/citations/19810015490/downloads/19810015490.pdf

Now , if youd read that . And tell me your synopsis .

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https://www.whiteboxlearning.com/c/application/glider/g1l0306.html

So , if the tailplanes half the size , the aerodynmic center goes back , as does the C G ! .  ?     

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Did the Adamisins read all this ?

Vee-tail conceptual design criteria
https://www.sciencedirect.com/science/article/pii/S100093611830222X

Preliminary Design and Static Stability Analysis of V-Tail
file:///C:/Users/PublicInternet/Downloads/126009499.pdf
file:///C:/Users/PublicInternet/Downloads/126009499.pdf

or " Preliminary Design and Static Stability Analysis of V-Tail Small
Fixed-wing Unmanned Aerial Vehicle Purposed for Racing Plane
Pilots and Anti-drone Training Platform Using XFLR-5 "

"Chinese Journal of Aeronautics
Chinese Journal of Aeronautics
Volume 32, Issue 3, March 2019, Pages 595-610
Chinese Journal of Aeronautics
Vee-tail conceptual design criteria for commercial transport aeroplanes "

Just looking at Swee Pea / Sky Baby pictures . One drin .

[Dave_Trible]

I have designed and flown one competitive stunt V tailed airplane about 25 years ago.   I didn't use or require much math to do so.   I took an airplane I had been flying for a few years and built a V tailed version.   I'm not too sure how much these equations will help because they don't consider the main two issues of concern-   Flying in a tethered circle with constant wind vector changes and how the V tail seriously distorts maneuver turning capabilities comparing inside to outside turns.   My airplane had the stab/elevator tips lifted 30 degrees,   was powered with a Wiley .40 on pipe and was around 650 sq. at about 53-54 ounces.    In real nice stunt heaven air the ship was really sweet to fly.  BUT when flying in the wind the empenage could not decide to be stab or rudder depending on wind velocity and momentary direction.  Twice,  including during an official flight the airplane did a half barrel roll inward to fully inverted and then rolled right back and didn't crash.    The second problem was the airplane turned inside like dynamite but horrendously slow and large outside.   This was because the mean center line of the stab was now several inches above the thrust line.   I had to build a special handle with tons of bias that would yield roughy 10 degrees of 'up' and probably 40 degrees of down.  With that I was able to balance the turns and feel to a large extent.   
I cannot say to what extent Denny had to deal with these issues but I do know he flew a V at the Nats recently and the V looks to be limited to something not over 15 degrees.   I should have asked but didn't.   My guess is he did this to minimize some of these problems.

Dave

[M Spencer]

Thanks .

Lost blades on the big Folkerts , and the fuselage disintegrated . a while back .

DONT CARRY A PLANE BY A PROPELLOR BLADE  .

Saw stuff on Chesters ' Swee Pea ' , acually ' Sky Baby ' recovered . ( as in the substantial remains - )
hence digging out V tail etc info .

Thought the wing 9 folkerts 0 would suit . But the idea hasnt stettled well . the GOON is a easier option .

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the inverted V on the F4e  phantom , worked well . In demanding conditions , the tail plane slid through the wing wash .
rather than hitting the flap / wake , all at once - youd fell it progressively or suchlike - say half the thump, or conventional .

BUT  its sorta a ' cruciform ' as it DOES have a rudder , so a inverted ' Y ' only 1 3/4 anheadral . maybe ten degrees .

these artisitic types work through intuition , so maybe Mr Bugatti visualised the requirements .

the Phantom , 2nd id built , I overdidit on the rudder area , got severe weather vaneing . Or distinct weather vaneing .
just kick into & out of yaw . up 7 downwind . Could getcha into the clover , too . Educational for piloting technique .

hammering it in calmish air , cutting loose 12 times ( needing quick action to regain tension ) whereas next flight intentionally calmer input , no trouble .
So maybe hammering abrupt full travel ( it had 30 % 45 Deg . ) on the ' non flat ' tailplane is not the thing to do .

[M Spencer]

To digress .

' classic ' era , thet talk of ' flicking ' the handle , tro initiate manouvres . Fair crack of the whip ! ?

Id called it like a cross between fishing , flying a kite , and rideing a bicyle . At the Controls - HANDLE .
here in Aus. Rural types can go on about the stockman & his whip . Kill a fly , take a ciggarette out of your mouth & suchlike .

So a decent stockwhi is a work of art , considerable skill to manufacture , to get them' just right ' . Like our aeroplanes .

I think some of the stockmans whip techniques can be comparable to flying . Particularly to flying a barely adequately powered
plane when is gusty conditions of 12 to 25 knots windspeed . steady airs not so tricky .

Rewarding if its a bit of a knockabout / hack . Not your mega hour front row ship . as it gunna get planted occasional .
You even learn CRAshing TECNIQUES . tHE TIME , IF ALLS LOST , TO HIT THE LINES TIGHT , IS jUST bEFORE IMPACT

you can remove a lot of inertia . also , getting it to ' go in ' square , the loads arnt diagonal  , wrenching it apart .
the marsh reserve couldnt be mown in thw wet months .  THEN was the time to take risks / learn the tricks . the decelerations way more progressive .
A Sun baked ground is not good , for impacts . ( Wondered if that had calling in Paul walkers naming of His . assume its the more normal ' visual ' Impact . )

Just about lost the typhoon saturday . unmown lawn catching lines on takeoff . Howling wind & it turned insides on a sixpeence , somewhat less aggresive outsides .
Think i will persue the notta lotta nose avenue . The  initiateing 7 exiting turns dept. seems promissing . V good stability & response . Theres a Tempest half built .

My not particularly blunt L E , on v tight turns , at 86 ounce ( oops . at the moment ) definately highlights any ' concerns ' yaw control . Though It Is innner wing stall
createing the yaw . And the assymetry ( in spans ) maybe immediately has THAT wing ' picking up the lines ' as in flying OUT . So we cant complain . as it is a experiment .