Author Topic: uberflak effect of patches on flight models?  (Read 1232 times)

Offline Citabria

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uberflak effect of patches on flight models?
« Reply #15 on: January 13, 2001, 03:23:00 PM »
HT the question is what effect could be so great at low speed that it counteracts p-factor and the spiraling slipstream completely and yaws the plane back to the right without the pilot providing any rudder deflection while in a steady state climb?

don't kill the messenger!      
this isn't a rebuke or a flame.
it's an observation that somthing in the AH virtual world is out of alignment

in 1.04/1.05 somthing has gone wrong with the torque effects overall and it probably is the area you said needs work the most... the spiraling slipstream.

go in the game launch an f4u1d from a carrier. climb out at 120mph or less. (p-factor and spiralling slipstream should be quite noticeable and require a good deal of right  rudder deflection but it dosn't)

notice that with no trim inputs the f4u1d in AH requires about 1-2 degrees of left rudder. autoclimb produces the same effect and also needs 1-2 degrees of left rudder trim for coordinated flight.


f4u flight manual(yes I know the f4u vertical stabilizer was canted 3 degrees):
     
Quote
normal takeoff:
rudder 6º right
aileron 6º right
elevator 1º up

45" 2,700 rpm
20-30º flaps

carrier takeoff:
rudder 6º right
aileron 6º right
elevator 1º up

43.5" 2250 rpm rated cruise

2330 32" under 14,500 ft
2150 29" best cruise

Stall power off, landing config, 30 flaps
77 knots
74 knots power on


this need for left rudder for coordinated flight at low speed is occuring on almost all single engine aircraft with clokwise props.

[This message has been edited by Citabria (edited 01-13-2001).]
Fester was my in game name until September 2013

Offline Citabria

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uberflak effect of patches on flight models?
« Reply #16 on: January 13, 2001, 09:00:00 PM »
heres a good link on the subject HT.

it backs up your programming and statement that the other effects are in alignment but the spiralling slipstream needs more work

 
Quote
This angle-of-attack effect is in addition to (and usually smaller than) the airspeed effect discussed previously. Both are small compared to the helical propwash effect.

   

 http://www.monmouth.com/~jsd/how/htm/yaw.html#fig_p_factor_aoa
 http://www.monmouth.com/~jsd/how/htm/yaw.html


[This message has been edited by Citabria (edited 01-13-2001).]
Fester was my in game name until September 2013