Naye , Frank . Though envisageing a push pull plane , somewhat like that . Even Got Two OS 25 LAs for it , but they might be pirated for a 67 in Comet De H 88 .
Been Fumeing Ive only got two 3/4 x 1/8 spruce for spars for over a year , hunting more close grain straight spruce . Got out the drg, and found I only NEED TWO .
The bellcrank thing , visualising say - a 12 knot 15 mph STEADY wind - from afar, minimum . So theres a steady constant drag the pilot etc Downwind .
So say we're in the horizontal eight - heres a bit of line tension . ( theres a marlin on the line
) LATERAL LOAD restrained at SAY outer placed bellcrank .
NOW , say THAT load is equivalent to the LIFT load ; about the same amount , call em equal .
Being pushed and pulled sideways away thru ( American spelling ! ) the DOWNHILL Curve , where I find theres a few forces operating .
( degressing , in 20 Kt - the lower Sq. Eight & Sq. loop corners give a bigger Jolt down the wires than the Hourglass / Triangle corner,
I figure this is the Duration of the Corner is Shorter , thus a ' thump ' rather than say a ' heave ' in the later .)
Thus our plane is sequered at say 2/3 span ( if the booms are @ 1/3 out ). Yet the LIFT is ( say ) equal A L O N G the span .
so the LIFT is 2/3 inboard of the point of lateral restraint .
If we're pulling rather a lot of lift , to stop the sidedraft dragging the ship into the deck - more top control required in the lower quarter of the loops ,
IS the sideforce on the wires sufficient to steady the tip from lowering or raising .
following this train of though ; If the mounts at the Inner Boom ( say 1/3 out ) is the 2/3 lift OUTSIDE the ' secureing point '
going to lift the outer wing against the Half the ( tip guide ) restraint , as the tip is half the distance of the Outer Placed crank .
Ive Found a bit of Diheadral sort of centers the lift . upright the ' sink ' effect concentrates with outward flow ??
and inverted the main support ( turning inside ) is concentrated toward the center with inward flow effect .Perhaps .
At least they seem a sight steadier in gusty turbulent air , that'll pull a flat wing about , over about 18 knots ,
discernible from about 15 with heavyish aeroplanes , maybe 12 with lightly loaded ones .
The MB3 at about 18 lb per Sq Ft was marvellously steady in the wind , visually .small overpowered plane on 18 thou. 7 strand steel .
the 016 solids would discernably stretch or give a bit of a twang , wind over 18 Kts on this and the 63 in Spitfire , once Id Diheadraled that .
A disturbing
thump at the handle in the bottom corners of the squares , as the winds hard and steadier at ground level .
After Id epoxied the under C.S. sheet join on the MB3 , I did a session of mainly squares in the wind . The thumps opened the crack thru
the lower wing sheet join again . This was done to Al Rabes Mustang 5 Formular / Airfoils , bar scale flying surfaces plan ,
Tho his TailPlane Ratio Formlar verified it ( the Tailplane ) was adequate . A hoot to fly , but ' relaxing ' wasn't the operative word .
So what im getting at is , say a light ( 11 Oz Sq Ft ) twin boom sucker going to start getting awkward if theres enough air around to fly a kite way up or get a yacht moving ,
if the bellcranks NOT in the Center Section . Id stuck it there in the 78 in. P-38 , with attendant serpentine control layout ,
pushrod split to left & right inner Flap - Horn at outer edge of inner flaps , to pushrods down BOTH booms ( technically you need lighter pushrods - I used 3 / 32 ) to elevator horns in Ea Boom .
No the lowest component count , with this set up . And a ' flying ' pushrod back from the center nacelle isn't going to work on a Push Pull plane . Hence the Picture .
Theres also the ' lines've gone slack ' trip . What will happen when the thing hits back out on them .
The MB# without a ' anti ' P ' rudder could ' cut out ' if you wertnt carefull at the Top Hourglass Corner or going into the Cloverleaf . This required running like snot . ( never hit the deck ) BUT ,
if it disappeared over your right shoulder to say ' 10 O'clock , with deadupwind being 12 , downwind 6 . say . BUT itd been going to bore in halfway out so youd lept severally that far over across
4 or 5 O'clock way , AS they snapped tight on Full Down with it at 5 Ft Inverted INTO the wind , It'd Do Another ' P ' effect Turn Nose Up Across the Top Again , but in a Straight Line rather than out on the wires .
This'd have you leaping Full Bore up 2' O'clock way . Rather Quickly .
This was all rather good fun . But definitely not relaxing .
As I said it never cracked up , unlike the straight wing suckers the wind would carry more .
So Im Wondering if that belcrank position out on a boom is going to work trying stupid stunts like this . They tell me its safer than motorcycling .
Was definitely considering a Crash Helmet with the MB3 as 650 plus Ounces pulled by a G 51 would've hurt if you ended up wearing it , which couldn't be discounted tripping over or something .
We're trying to figure a realistic MB 3 fuse , too .