Instellingen Twister 2

Nut snapflap

ik zie niet echt het nut van die snapflap... kan iemand me uitleggen welk voordeel je hieruit haalt? want bij mijn weten ga je dan ook weer erg versnellen bij het downsturen...

Ten eerste ben ik geen (echte) DLG'er, maar heb ervaring in F5B, F5D en F3F.
Bij die diciplines en bij F3B is het van belang on op de rechte einden een heel lage weerstand te hebben bij (heel) hoge snelheid. Dus een profiel met weinig welving en de minimale weerstand bij een Cl van rond de 0.1 of lager.
Verder moet er een scherpe bocht worden gevlogen waarij weinig weerstand wordt gevraagd bij een Cl van 0.8 of hoger.

Bij al deze diciplines wordt de snapflap gebruikt om gedurende de taak snel en automatisch de juiste welving te krijgen.
Sommigen gebruiken alleen een extra positieve welving bij 'up', anderen gebruiken ook extra negatieve welving bij 'down'. Afhankelijk van het uitgangsprofiel en de persoonlijke smaak c.q. vliegstijl.
Acro zweef vliegers gebruiken soms de flap op een eigen knuppel los van het hoogteroer. De knuppel die normaal voor gas gebruikt wordt krijgt dan zijn veer terug en er wordt daarmee de flap met de hand bijgestuurt.

Voor DLG lijkt mij (voor wat mijn gedachten waard zijn, zie boven) de snapflap minder snel nodig wanneer je een vlucht fasen schakelaar hebt. Dan kun je voor de start, zweef en voor doorsteken een vaste flapstand in programmeren.

Rick
 
70mm! I found mine piggy at 75 and moved it back to 80. How do you read the light thermals? My usual procedure is to move the CG back until the plane hunts in pitch then move it forward one step.

Sorry for the English.
 
Hey greg,

I think when you are used to a more forward CG it you will see the minor differences when you fly into the light stuff. In calm winter air i have been flying my CG to 79 mm and it goes wel but as soon as the air start moving i noticed a lot of times that the plane dives down when you hit the turbulence and it always cost you 1 or 2 meters before you can recover it. A plane that recover itselfs constantly doesn't have this bad habit and wil fly more efficiënt and thus longer in turbulent air . The good sideaffect is that with the forward CG you can fly with a lot more flap and carry a lot more weight.
In the really light stuf you can fly with your flaps more down or even in thermal mode and this will make the plane more sensitive again.
 
OK I flew it today at 70mm and it was better than I expected. With a little extra camber I could go out on low thermals but I did feel it lost a bit of sensitivity and range compared with 80mm.

In dead calm conditions at 80mm the plane magically slows down to what seems like half speed. I can pick the lightest thermals and see things that other people are not seeing. However when the wind picks up a little it does become harder to control. I think I may move the default forward to 78-77 and see how I like it. At times in high winds I was thinking to revert back to the Twister 1 because it handles the turbulence so well, but now I am thinking it has more to do with the CG. Not sure it is a good idea to change style right before a contest but I have a week to play with it.

Not sure what conditions you get there but we occasionally have contest days where the air is so still it is like indoors. Sunny and warm but with much less lift than you would expect. In this case I may go back to 80mm.

Clearly the plane is versatile.

After watching some monster launches by our local strong boys I had the opportunity to fly a Stobel V2 and V3 thinking there was something to be gained. I threw and threw and threw with all I had and guess what, they are all very close, it is the arm.
 
Not sure what conditions you get there but we occasionally have contest days where the air is so still it is like indoors. Sunny and warm but with much less lift than you would expect. In this case I may go back to 80mm.

Clearly the plane is versatile.

After watching some monster launches by our local strong boys I had the opportunity to fly a Stobel V2 and V3 thinking there was something to be gained. I threw and threw and threw with all I had and guess what, they are all very close, it is the arm.

Greg,
The last 2 contest i flew i had to fly my plane at 420 grams and when the wind picked up after a good moment i was still blown backwarts. 1 circle in this air would have set you back about 100+ yards. In the round with the last flight my first 4 flights didn't even break the 1 minute mark wit a wopping 30 seconds as the worst. In the moments between when the air was good we still could get the thermals . Just to keep control you have to put your CG at the 70 mm range and keep a lot of speed all the time. Very occasional we have a contest were no ballast is required and then i will fly my CG at the 74 mm range but more backwarts then that wil mostly cost controlablity and as a result flight time.
 
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