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Re: Bush planes

Postby MountainFlyerN22 » Thu Dec 31, 2015 9:02 pm

PA-20 UPDATE:

PA-20 tailwheel is now castering to solve steering issues.No lock yet,have to figure that bit out. Fixed the steering.
On takeoff be hold the tailwheel down for improved steering until sufficient airspeed as been gained to use the rudder.
Also added wheelpants to the PA-20 model, should work with the toggle just like the Tripacer.

See page one for download.
Thanks to SP-K79 for the fix. :D Thanks!

Enjoy,
N22
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Re: Bush planes

Postby MountainFlyerN22 » Thu Dec 31, 2015 11:02 pm

Anyone know how to contact someone with FG Brazil?
I just want to ask them before I post my mods of their AB-115 out of courtesy.
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Re: Bush planes

Postby Martien van der P. » Fri Jan 01, 2016 1:23 am

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Re: Bush planes

Postby SP-K79 » Tue Jan 05, 2016 9:43 am

Finally figured it out myself.

Here it is:

Code: Select all
<gear x="-5" y="0" z="-0.25" compression="0.16"> <!-- tailwheel  -->
  <control-input axis="/controls/gear/tailwheel-lock" control="CASTERING"
                 src0="0" src1="1"
                 dst0="1" dst1="0"/>
</gear>

<!-- tail wheel -->
<gear x="-5" y="0" z="-0.25" compression="0.16" spring="0.8">
  <control-input axis="/controls/flight/rudder" control="STEER"
                 src0="-1.0" src1="1.0"
                 dst0="0.3" dst1="-0.3"/>
</gear>


Hope this helps you all as much as it helped me.
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Re: Bush planes

Postby SP-K79 » Tue Jan 05, 2016 2:29 pm

MountainFlyerN22 wrote in Thu Dec 31, 2015 9:02 pm:PA-20 UPDATE:

On takeoff be hold the tailwheel down for improved steering until sufficient airspeed as been gained to use the rudder.
Also added wheelpants to the PA-20 model, should work with the toggle just like the Tripacer.


Yup, very true. Also make sure you set the trim for takeoff or even a bit more up and it won't squirm on takeoff and lock the tail wheel.

The second key is gradually adding power and at 40 you need to start feeding in right rudder.

On approach make sure to unlock the tail wheel so you have control after touchdown.
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Re: Bush planes

Postby MountainFlyerN22 » Tue Jan 05, 2016 3:23 pm

How do you lock and unlock the tailwheels? Cause it looks like there's 2 tailwheels to me.

The second key is gradually adding power and at 40 you need to start feeding in right rudder.

Not enough runway when I fly to do that. :lol:
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Re: Bush planes

Postby SP-K79 » Tue Jan 05, 2016 3:49 pm

FG preset is "l" (lower case letter L).

You don't have to do it sluggishly. But you can't just press the button and hold it or use a joystick to slam it open. Just a bit slower and you'll be fine. Remember the trim. Set it to takeoff or even more up.

After practicing for about an hour I can make really short takeoffs now. And remember the rotating slip stream, asymmetric loading and gyroscopic progression. First rudder right than left to counter and finally right.

Get used to it in a J-3 first.

I'll be posting an article on flying a wheel dragger soon.
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Re: Bush planes

Postby MountainFlyerN22 » Wed Jan 06, 2016 1:20 am

My take of is pretty similar. Full brakes, full power, hold the tail down, brakes off, right-left -right rudder,pump full flaps to lift off, once off 1/2 flaps,accelerate and climb, flaps up, off I go.
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Re: Bush planes

Postby SP-K79 » Wed Jan 06, 2016 10:43 am

Yup very true. Once you get a hang of the rudder that's what you progress to (full power of the brakes).

Flaps are used in sync with the elevator at liftoff. You pull on the elevator and the flaps at the same time and release to 1/2 as you bump the elevator forward.
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Re: Bush planes

Postby MountainFlyerN22 » Sat Jan 09, 2016 8:56 pm

AB-115 w/ skis and bushwheels added.

Original aircraft by FG Brasil.
I just added the skis and bushwheels.
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Re: Bush planes

Postby MountainFlyerN22 » Sun Jan 10, 2016 2:41 pm

Does anyone know if FG models ground effect?
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Re: Bush planes

Postby Johan G » Sun Jan 10, 2016 9:32 pm

On JSBSim aircraft it can be modeled, provided that the aircraft's FDM developer add it in. Otherwise, most probably not.
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Re: Bush planes

Postby MountainFlyerN22 » Sun Jan 10, 2016 11:59 pm

Thanks.
I didn't think it did based on how the aircraft acted,but always wondered.
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Re: Bush planes

Postby SP-K79 » Thu Jan 14, 2016 3:20 pm

FLYING TAILDRAGGERS

I am not sure weather to post this here however, since the title is Bush planes it should be fine.

Besides issues with the models we have mentioned earlier, taildraggers sure can be a handful.

Here are a few tips to help you enjoy the "real planes".

GROUND OPPERATIONS
Before engine start.................stick always back.
Breaks....................................check.
Taxing INTO the wind............stick back and into the wind.
Taxing WITH the wind...........stick forward and with the wind.

TAKEOFF
Taildragger CG is behind the main gear, causing negative stability – the “gorilla effect”.

Force required to correct a turn increases with time and radius of turn – the “big gorilla effect”.

If a turn is not stopped quickly, the rudder will not have enough force to correct.

Under power, the rotating slip stream makes the aircraft turn right.

Asymmetric loading of the propeller, the “P effect”, gives further left turn tendency especially with the tail on the ground.

Gyroscopic procession of the propeller causes a turning motion when the tail comes up.

The “P effect” lessons when the tail wheel is up.

Gyroscopic procession stops when the tail wheel is up.

“Punch and jab” to stop effects in time and to avoid “sneaking” and ground looping.

Do not lift the tail, if it comes up just keep it barely off and stay in ground effect.

On grass or loose surfaces use 1 notch of flaps.

TAKEOFF:
stick............................back
roll centre line............rudder left than right than left
lift tail
takeoff with tail up
fly off.

FLIGHT
The planes are not acrobatic, it is the pilot who has acrobatic abilities.

In winter, higher air density, more lift.

Finer pitch propellers, such as on sea planes, spin at higher RPM giving more horse power. Thus giving lower cruise speed because the engine can be over rotated.

STALL:
To induce a stall, yank back the controls and “tap” left rudder at the stalling speed. However, real world stalls happen most often when turning final and too much inside rudder is added at about 500 feet AGL.

Abrupt flying leads to accelerated stalls.

Spin recover:
power idle
neutral ailerons
opposite rudder to stop rotation
recover from dive
add power to cruise.

APPROACH
If you see you are high on approach first pull back the power.

When you reduce power drop the nose not to stretch the glide.

Taildraggers are usually high drag aircraft.

Once power is off they drops speed quickly and starts to drop.

Use the throttle to adjust glide path and use pitch for speed.

Change tank only when runway is made.

On downwind set power to 2200/2300 RPM than trim for level flight. Once power is reduced the aircraft will be slightly nose heavy. Once flaps are fully down, trim should be almost perfect.

On base leg deploy full flaps.

Start descent on turning final.

On final, best glide speed multiplied by the minimum descent speed. Or half way between best glide speed and stall speed, approximately 1.3 times the stall speed. Fly stable on final.

LANDING
“Punch” the stick forward just before touchdown to wheel land. After main touches down, gently apply forward pressure. Apply the stick back when the tail is down.

To three point land flare just before touchdown. Keep the stick back after touchdown.

30% or less crosswind @ 15 KN is ok to land. Slip into the wind just before touchdown with the upwind wheel(s) touching down first.

“Stuff” the stick in the bottom right corner or the forward corner in a cross wind after touchdown.

Hope this helps.
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Re: Bush planes

Postby SP-K79 » Thu Jan 14, 2016 3:24 pm

Here are sample checklists for the PA-18 which can be applied to other taildraggers when changed to fit the aircraft. This might be useful for some as well.

RUN UP:
BRAKES SET
TEMPRETURES GREEN
FUEL ON FULLEST TANK
STICK BACK
THROTTLE 1800 RPM
MAGNETOS CHECK
MIXTURE CHECK
CARB. HEAT CHECK
THROTTLE SLOW IDLE
THROTTLE 900 RPM
CARB. HEAT OFF
THROTTLE 1000 RPM

PRE TAKEOFF CHECK:
THROTTLE 1000 RPM
PRIMER LOCKED
MASTER ON
MAGS. BOTH
CARB. HEAT COLD
MIXTUE RICH
FLAPS AS REQUIRED
TRIM SET
FUEL VALVE ON
DOOR SECURE
SEATS/HARNESS CHECK
CONTROLS FREE
ALTIMITER SET
TAKEOFF BRIEFING
TAKEOFF TIME NOTED
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