NOT LA 25 , But Brett has us discourseing on our own observations . Hold On tight . Pay Attention . and Dont Let Go , as it were ( see below )
Used Al's Mk V Mustang airfoil on the MB3 . Sent him some drawings & pictures . his Comment " Your Airfoils seem a bit thin , for modern F2B " seemed amusing . As they were HIS Airfoils .
As for efficancy ? U Tube ' reveals ' nearly all flights ARE 5.0 to maybe 5.2 , IF the ' dubbing ' speeds correct . Get a watch on a few & check , if you doubt it .
The MB3 at TWO KILO , 71 once odd . ' well built ' as far as stiffness goes , and controls , at 50 in span & 530 ish area , wasnt good outside 5 / 5.1 on 60s if I recall right . .018 Laystrate 7 stand steel .
HOWEVER , in a Gale , it was like being bolted in a 440 Dodge on a wet skidpan with a stuck throttle . ( HENCE relateing the Info for Paul - If he went Electric He could put a Igor G thingo in it .
)
G 51 on a 10 x 6 black 3 blade , Tried a K&B 40 with the pump for a 10 x 4 three blade . As eventually the billowing air up past 20 windspeed , anything start kiteing . In Hill Country so theres rolling waves
in the wind flow & pressure .
Id back then , start the Vertical eight from inverted downward . a leap of faith required . The Aeroplane see4med to find its own consistant bottoms AT the right altitude . As you seemed to be feeding full up in , and hanging on and hopeing , I could never figure how it could do clean & accuratre squares . The second Day of flying just squares , with the K&B , about 25 windspeed , the jolts at the bottom corners were cracking
the underside wing sheeting . it was all built from F'ing stiff Wood . Some'd been ten years in the rafters of a tim roof . The wing sheeting .
So , LIFT , which hev seemed obsessed with , evidently was produced , under " Full deflection " , as he had evaluated .
Your Hair'd be near standing on end , and the impulse was to find a stiff drink , Particularly after it cut loose ovehead with the G 51 Hard Out . Due to no Yaw Counter . No moveable rudder hooked up .
Instant ' wheres my crash HELMET , and arm over head . But impulse to SPRINT was stronger . Despite these ( into Clover & across Top of Hourglass , took away the impulse to ' hammer ' the turn ,
it had to be ' flown ' . BUT windspped past 20 it was evident a rudder was required , as it was interfering with a accurate pattern , up there , then .
the General impression was say akin to being stuck in a Grand Priix car . one of these ground effect things , and told to STEER , " we'll work the brakes & Throttle " No Proplems . Yea Right . alright for you to say .
Id found all the junk flown , the 18 knot ( estimated ) windspeed was where one had to start paying attention , as things began to happen quickly , and you stasrted looking at the 4.5 lap speed .
the WIND would kite it to that lapspeed , needle untouched .
The plane NEVER hit the deck . Tho the pilot hit the roof several times each flight . BUt the performance was , in general ( we already coverd rudder misshaps ) TO THE BOOK .
So , I figure one at 45 Oz with a Como 40 , on a 10 x 4 would do the trick . scale Planform . SOLID SHEET flaps & empenage .
I can see why He'd put FIVE LAYERS of Glass Cloth on the FLAPS , but im not sure it was necessary for attaching the canopy .
on his Big Saitio 72 etc Ships .
If He'd found the Como 51 in the 70s ( probly a 80's motor ? ) He woulda been fine . His stroked 51 had WEIRD timing , low rpm's .
He Did Not Find , or think he should , go to a low pitch , for wind flying .
Where Id strongly dissagree THERE . and Folow Bretts Lead .
As for PIPE's . Fine , great , governings brilliant .
But they dont fit in a semi scale wotsit easy , and dont grow on trees , for back yard experiments . Wot got a guy airbourne in NZ as soon as anyone with a plane way more current than over there .Bleedy farmers .
Solid Stiff Torsionally very stiff straight even grained 12 lb wood flaps , or harder . bout that almost for tailplane & elevators . If anyone doubts it , thats there problem . Al's Stuff isnt totally appaling ,
And Anything in a gust rolling 20 knot wind , is going to buffet & judder a bit , unless the airs pretty smooth ! . AND will be down close to 5.0 a lap , with the ' wind behind it ' ( as a GENERAL rather than aeronautical term )
As In It will be Kiteing , even if all the modernisms halt & control the kiteing , the forces they are dealing with , ARE the forces generted BY the ' Wind Force ' , the energy generted by the ' windage ' =
moving atmosphere transversing aeroplane .
SMOOTH Air is a differant game . Draw your own conclusions. BUt a ' scale planform ' built ridgid , can deal with those conditions SMOOTHLY .
YAW on a Diheadral wing , if acute , presents the TOP of one wing , and the UNDERSIDE of the other , to the airflow . and is not advised .
Measures to counter yaw , might be considered adviseable .
Or take a helmet , and youll need to run foking quick , to get the lines tight again .
AND if you ' catch ' it upwind , inverted , and low airspeed . IF you Dont Keep the Nose Low , it'll blow in up and across , and you gunna hafta leap like a kangaroo upwind to catch it as its headed for the other side .
good Exercise ,
but if inept there FIT A MOVING RUDDER . Hammering the Turns , the restraint translates the force into yaw . if brief & positionings favourable , its manadgeable . If conter productive forces combine cumulative ,
Oh Sheet .
Run Forrest , Run .
Scuse tha splenink .
Horses for courses . Of course , every Jockey has the Best Horse . But . Differant configurations have their strenghts and weaknesses . FSR 25 , whick IS a LA 25 , Almost , id Down from a 9 1/2 - 6 ,
as it was kiteing ,
and try a 9 x 6 black tornado .
Sometimes it worked better than others. When the Wind was over 18 knots .
Latter i found one of the two 9 x 6's was a 9 x 4 .
I wonder why oneoffem worked better .
Thats onna 47 Oz nobler size Thing .
The FSR is a ball race with the SAME TO END as a FP 25 , which is like a FP 25 . The BLACK Tornado 9 x 4 will haul ass . Used 55 ft of .018 , so gotta bout 58 Foot . Like wot Bob Gieske was once ,
HE worked IN the WIND . The Ball race ones got a bit more reserve , under load it can keep coming on . I had a 7.5 intake & a 3.5 ? odd spraybar ( Taipan ) Tank Inboard of intake . Worked Good.
Only hit the deck one or two dozen times in ten gallons . 30 knot winds it was a hanfull , and would STOP sometimes , in gusts , overhead . But stay going .
No room for innatention in gales .