What makes a plane feel light or heavy in the air?
WEIGHT .
just kiddig , maybe .
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being having reading to much , the Galdini olympic artical , Stunt Column in Model Aviation - on Gieske , and Rabe , and OTHERS ,
start with ' worn controls ' saying wont fly right till they get a bit of slack in them ,
THEN ,
Galdini , 5 mm slack at T E elevators Reqd ,
Gieseke , 1/8 to 1/4 slack at T E Elevator ,
Rabe , ' Dead Zone - thicker stab than elevator .
The Theory , If you move flaps BEFORE Elevator - you get good ' GROOVE ' . The effective incidance changes ( in level flight ) without changeing the A.o.A.
( being angle of attack . nose up/ nose down )
Id found on one plane , after removeing the 5 mm slack at the T.E. of 2 in chord elevators , the thing wove everywhere , loops , wingover , level , Sq 8 legs as this was considerably irritateing , after two weeks I reaccessed the elevator horns and re slacked of them .
The P51 also suffered a few ailments , a 1/8 horn , the cutting in ( again ) and fitting a flattened 3/16 brasss tube , ( two x 3/32 drill shanks fit adjacent )
got 6 mm slack at the T E ( 3 1/4 chord ) and it ' found the groove ' and lost all its trigger happy tendancies .
NONE of these suckers have oversize tailplanes . Bob Hunt is not a fan of the ' dead zone ' theory , but his have the large % Tailplanes
and oft comments on how earlier he flew Fwd. C. G.s , compared to young Bill Werwage . So this qualifies things a bit .
The first of mine I mentioned was my third F4E Phantom , which is a pirate of a Bjornwall Mustunt P 51 B , moments areas , wing , Bulkhead posn .
Measuring C G found it 3/4 aft of his designated posn. o.k. with the slack . not without . Snappy performer , handles wind well , with a bit of ' tecnique ' ,
But Dislikes aggressive inputs , it came in twelve times on a flight after the city traffic and hysteria .
Hair Trigger & Fingertip control , or easing & flying it . Not attacking it with a mallet . Will do the Bi Slob Tricks , richened up
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Thus Therefore and Sofar , 3/16 free play at T E Elevators : GOOD . any slack bellcrank ( leadouts ) to Flaps : BAD .
a profile should enable you to ascertain this No Sweat .
Some Theorise the pushrod slack at the Flap Horn ( to Elevator ) - Gieseke ; which alows the pushrod mass as a dampner on the floating travel .