Design > Stunt design
Another odd question - Forward sept wing trailing edge and flap hinge line
doug coursey:
HERES A VIDEO OF WINDYS SPITFIRE WITH SWEPT TRAILING EDGES
Steve Helmick:
When asked about that (swept forward flap hingeline), Paul Walker said it made trimming MUCH more difficult.
I'd leave it at that, but considering that a lot of models are flown for years and still aren't really well trimmed, it makes sense to just don't do it. H^^ Steve
Air Ministry:
VD~ But if ya gotta do it ! , its gotta be done , as in if your trying a semi scale somthin , it CAN be workable , even a Non semiscale somthin , like the Genisis III , Crossfire cetra .
The Typhoons butchered for a ST 60 from the previous RV OS 80 , considerably smaller motor , but 15 5 nitro and it swings the 12 x 6 Master three blade o.k. .
The engine bay work swa the C G go way higher , or somewhat higher , unforseen . ( shifted beares from under drop in from top engine with top cover , to
cowl from existing underside , angle cut . Bearers etc OVER ( above / underslug ST 60 ) with the front cowl now LEAD . as its 12 Vs 18 Ounce . And a ounce in the lower lip .
AND a heavy spinner dome nut .
%^@
The previous swinging in triangle bottoms , on these things , is largely eliminated , going to .016 solids instead of the .018 seven strand steel lines . Less drag & inirtia in the wire , and less weight maybe .
Last flights on the typhoon had it a slight weave / kick in the hourglass bottom , eased but still tight . V tight if you say you caint doa fivefoot corner .Slight wallow . Similar slight wallow in tight Sq inside
bottom , but ased / opened - no swing .
Got non adj. leadouts with 1 3/4 od spacing . SO . . . . Id thought it now 76 Ounce , but the scales say 82 . plus 5 or 6 ounces of fuel . LL~ LL~ LL~ LL~ Oh Dear . I think it's 630 sq in odd . Very odd .
So if it can do it ( the schedule ) at that weight , resonably well . ( Better control - steerability - accuracy than a 64 oz Magnum with soft flaps . Theres no harm trying - if your willing to persevre and chop
things about , if you were to preocupied to install during the ' build ' . ( Wobbly rudder - adjustable leadouts ) Noext Time it'll get it . Figure I could hit 54 Oz ( 1/16 th wing , mouldded fuse & rear surfaces )
Spit on 11 x 5 1/2 on a mega rich flight 4 stroked pre igniting ? maybe ( only one gasket , 10 % nitro ) on a motor Ive had from new . So pulled to check bearings as slight brown Exhaust residue .
Or course , the replacement motor wont give the same run . So , ONCE it's rebearinged , watch out . Was 5.2 or 5.4 more likey . An estatic flight wot hit the mark . the .016s , turning well grooving , no swing.
AND I forgot the spinner Wt. nut on the uva mota , so it missed the mark on all that too . >:( >:( Which is why reputable souls keep a NOTE BOOK of ALL SETTINGS , so were told . and in M'Cyle racing . Particularly !
Another Notorious Example , https://stunthanger.com/smf/at-the-handle/oscillations-around-the-roll-axis/msg640718/#msg640718
Told by Brian ' Flys seven degrees Nose Out . You look straight down the inboard leadingedge - flying it ' ( nutha reputable says ' they ( F C ) Dont do TIGHT corners )
But if you want to get hysterical , THAT means the outer flap hinge is nearenough straight , whilst the inner hinge is raked to billyo . Which must do somethging , aerodynamically .
But Since Its Teathered !! Maybe it flys an inner wing and an outer wing , as two interconected dissimaler raked surfaces , aerodynamically . But anchored ( by lines ) and somewhat balanced Vs loads . ~^
Know Nuthin on This , aerowise . Plans on one of the ' free ' sites .
Therefore ' addition ' of raked flap hinge , with no other variations to a existing design , may not cut the cake , a THINK about the whole cabbodle as a INTEGRATED concept / design , might get you into it .
Having purloined the drawings for THIS , and tripped over some cheap light 2 1/2 spinners ( $ 2 ! 2 & a something , anyway . Think 2 3/8 does it .) Finally Figured INBOARD tanks , on a profile test ship . maybe .
One mighta noticed ALL Al's semi scale things ve got Raked Flap hinges , so the previous remark , You Might NEED to use raked flap Hinges , could hold tho the Berringer's didnt were less scale . take yer Pick .
THIS : ( Id been burning a gallon a week ) First Time Airbourne ,
Was Loops , Outside loop into Sq Out, into Sq 8 , then hourglass , wingover , clover repeat & other things . Good Evening Air . Thrown by Ex RAF Machanic from Biggles Day . Reapeared , With " Not Bad Eh . Not Bad " Which I though a high complement . Not a word on the castor smoke pouring aft , in his best blazer & tie . Followed Instructions . Clean Launch . So , The RAKED FLAP HINGE isnt always totally abysmal .
The 2 metre one'd be going now , if I pulled my finger out , for a week .
As part f a ' concept ' it can well work well . One or two whove tried it have won a thing or two withim .
Bill Schluckbier:
Air Ministry -
Thank you for posting the photos and your comments. I had seen photos of the Firecracker and Bandolero before; I believe in the PAMPA magazine.
Bill
Air Ministry:
The Bit between the teeth ! . :(
The braincell moves on from the last point , SO ;
Cogitating , it becomes evident , that PERHAPS . As the drag of the flap at the tip is Further Forward , the tendancy to swing ( yaw osscilation ) might be slkightly greater , acording to the degree of flap hinge sweep .
THEREFORe perhaps a touch more aft area / longitudeinal stability / weather vane effect , as in Fin or Aft side area , could be required to ' balance things ' again if say a Std set up was modified with / to a swept flap hingeline . :P
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' We ' come to this , as ( Contry to somes observations ) Ive Found the Diheadral set up ship , is generally more ' locked in ' on OUTSIDES . Presume the wing channels the airflow in a tad ( like the flap sweep trip )
so as they sit well and hgold the air . whereas on INSIDES they tend to skid - in the vertical - as airflow sweeps out and off . All but the Hurriane have this tendancy . Under Pressure .
Stinking hot day , bad engine run , or pilot not showing consideration to smooth & measured handle opperation ! . :o as in if yr a bit rough , she's o.k. on outsides , but lets ya know ona da inside squares .
The fancy ' lifting ' section At the ROOt can mean the FLAP at low deflection , in rounds , is more favourably aligned , in outsides , giving noticeably better lift in the bottom of the top outside in the vertical eight .
Allowing darn good ' hold ' and transition , smoothly , to thew lower inside . hurricane again better here , but the diheadral & flap sweep on the ten ton typhoon , alows it to do what no man would think it could .
82 ounce bigeezes . Shouldnt do nuthin .
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Theres oily Fircrackers , like THIS . Which theres a published plan for . And Later Firecrackers . AND a .35 firecracker plan .
Alan Resinger
These Below being the later one :
Heres a bitonit : https://pampacl.org/wp-content/uploads/2020/02/SN_Magazine_-NOV_DEC_2007.pdf theres a 2006 / build on Hoffmans , in stunt news . for a few strucyure photos ?
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