Two point landings

[j.sabo12]

Hello guys, 

Playing around with the finer points of the Mosquito, and having a bit of a hard time with nailing two point landings. I can do them without too much issue in a P-51  and P-47, and in real life (albeit on a somewhat more modest Zlin-226). 

Also, the Mosquito in Il-2 BOS is not an issue at all for this. 

What I find with the Mosquito in DCS is that it feels bouncy, and there is not so much rolling resistance in the tires - as if the tires have a huge amount of pressure. Even if I touch down extremely gently at the correct speed, I find myself bouncing back up into the air and having to come down to a three point landing. 

Anyone have any tips? Either direct Mosquito, or DCS? 

 

Thanks :)) 

 

[Terry Dactil]

Yes, I agree with you that the Mosquito does not behave realistically for a two wheel landing.

I was fortunate in the early days of my aviation career to fly many different types of tail draggers from the Tiger Moth  to the DC-3 and the Bristol Freighter. Like you, I know that pitch up on a two wheel touchdown is proportional to the sink rate. In fact if you have a really low vertical velocity on touchdown you can actually get a nose down pitch moment due to the drag from the wheels spinning up. 

I reported this unrealistic behavior about 4 years ago when the Mosquito was released, , but nothing has been done to fix it. Unfortunately I don't think it ever will be. The Mosquito is still labelled "Early Access" but probably could be more accurately labelled "Abandoned".

I spent some time with the configuration files looking at the possibility reducing the moment arm between the CG and the main wheels but a successful modification proved beyond my capabilities. Perhaps someone more qualified reading this will take up the challenge.

 

[Mav87th]

You have these to play with in the FMOptions.lua file:

Everything inserted with ---- is my comments

 

mainWheelStaticFricK = 0.71 ---- could be to low ?? higher value will make the plane harder to get out of parking, and unknown if it affects wheel not spun up before touchdown.
mainWheelSideFricK = 0.73*.9
mainWheelRollFricK = 0.022
mainWheelGlideFricK = 0.69
mainWheelBrakeMomentMax = 7500 --18000.0
mainWheelMOI = 8.32 >>likely moment of inertia

---- could be in this section that you would want to add a little more spungyness to prevent the plane from jumping up after touchdown. Perhaps the back damper to reduce the plane from jumping

-- until pneumatics compression not implemented
mainGearSpringForceFactor = 21000000000
mainGearSpringForceFactorRate = 9
mainGearStaticForce = 30000
mainGearReduceLength = 0.18
mainGearDirectDamperForceFactor = 50.0
mainGearBackDamperForceFactor = 75000.0
mainGearDamageLengthLim = 0.0 

and  then there is the stuff that is commented out

---- perhaps the pneumatic parameters that is mentioned in section two??

-- tire&strut params
--param0 = 1100000 -- main tire k_stiff
--param1 = 2300 -- main strut f_0
--param2 = 180000 -- main strut c
--param3 = 500000 --  tail strut k_stiff
--param4 = 7000 -- tail strut f_0

 

There is some guidance to find in this post 

 

[Terry Dactil]

Well there goes the rest of my weekend.  I'll be trying some mods to those values.

Thanks Mav87th - some good info there.

For anyone else interested in joining us to in improve the Mosquito's 2 wheel landing characteristics, the file is ...

<??>:\DCS World\Mods\aircraft\MosquitoFBMkVI\FM\FMOptions.lua

Edited Saturday at 11:56 PM by Terry Dactil