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HomeAircraftHelicopterComputer Flight SimulatorsOther › XTR lift loss in vortex condition
10-13-2005 08:47 PM  13 years agoPost 1
w.pasman

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Netherlands

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How do I get this "Main Rotor" parameter to do anything??
Lift loss in vortex (I assume they mean downwash) is a real issue when catching a quickly descending heli, and in tictocs. Up to now I could not get XTR simulate this properly. The heli always brakes a decent instantly when I add pitch, which is definitely not what the real machine does. What am I missing??

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10-13-2005 10:17 PM  13 years agoPost 2
MJA

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UK

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It worked for me with a definate effect when i wound it up to 100% and then tried to descent vertically straight down too quickly with no fore/aft or left/right cyclic or heli movement

Not sure if the vortex effect
would be too much of an aggravator in tic tocs anyway
as the heli generally moves too quickly to start to generate the vortex lift loss in own disturbed air scenario,
it is most prevelent anyway when descending flat disked in flat calm weather .

In reality you'd lose height quicker in tic tocs if you bog the rotor rpm,mistime the collective badly or have the heli disk too near vertical for too long or if the blades just don't bite the air too good,heavy underpowered heli etc


In XTR it tends to hang between tic tocs too long with steep rotor disc angles because the lift generation and sink rate of the heli is not right ie still generates too much vertical type lift (that takes it up and down on the screen)
for the steeper disc angles and doesn't descend quickly enough due to effects of gravity vs Lift
I haven't spent a great deal of time trying to fix this problem

The vortex lift parameter only seems to have any effect in XTR when descending truly vertically with a flat rotor disk .
I'd say that was likely to be an accurate behaviour for vortex lift loss parameter.

Adding weight to the heli is the usual favourite to fix a sensation of a semi helium filled heli,then adjust other stuff to compensate if necessary for the extra weight.Increasing the simulation time can help with the sink rate as it creates an illusion of extra speed,including the sink rate of the heli under 0 lift, but it tends to effect the whole thing so everything else has to be tamed down

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10-14-2005 07:15 AM  13 years agoPost 3
w.pasman

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Netherlands

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Hi Footaba,

Thanks for the elaborate reply

Still I feel the vortex problem in reality also plays in not-vertical descends and in tic tocs. Often I come in at say 45 degrees, and fast enough to have the smoke go up through the blades. From that last point you can already see a potential vortex problem and I then I can play with the downwash, either sinking through it and give lots of pitch to pull out, or by gradually breaking.
With tic tocs, I feel the same effect as with the vortex problem, and I then need lots of pitch to pull it out. With a lot of wind this problem is less severe, which also adds to my impression that this is a vortex/downwash problem. With a tictoc that's bad because you already are near the edge of available power.

Indeed I could fiddle with the weight, but that would affect other maneuvers as well that feel pretty right now. Maybe there is another parameter that I could fiddle with, that leaves the rest unaffected?

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