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« on: June 02, 2012, 05:08:17 AM »
rcpilotacro
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Vikalp Luthra suggested this, so the credit goes to him

We can have Quiz here, may be you could give some toffees to guys who answer right

anyone can start the quiz, multiple quiz can start together, whoever starts the quiz please number it, or give it a name or some identifier, guys answering out of the sequence, identify the quiz number and then post your answer, that way any newbie/guest can co-relate easily

Request

Shoot from your own logic, avoid picking answer from google, that way you will exercise your brain, not cyber brain
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« Reply #1 on: June 02, 2012, 05:11:24 AM »
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Quiz No 1

Does the weight matter in case of crosswind landing? if yes why? if no why? if the answer is yes and no qualify.

reward ?
toffee !!
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A Great pilot will practice until he canít get it wrong.
 

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« Reply #2 on: June 02, 2012, 08:37:27 AM »
manojswizera
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Yes the weight matters, because if the weight is more, the plane will be more stable rather than light weight which will get disturbed by the cross wing.  Roll Eyes  just guessing.  >Cheesy
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« Reply #3 on: June 02, 2012, 09:12:48 AM »
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QUIZ No 2
(Related to Multi-rotors)

You know that a pair of CW and CCW props each are used for a quadcopter, and this is done to compensate the unnecessary yaw effect caused when all props are rotating in the same direction.

QUESTION: If a person wishes to use only CW or CCW props on all 4 rotors, but still wants to avoid the unnecessary yaw, what should he do?

This was an easy one.

Vineet

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« Reply #4 on: June 02, 2012, 09:43:11 AM »
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QUESTION: If a person wishes to use only CW or CCW props on all 4 rotors, but still wants to avoid the unnecessary yaw, what should he do?



Mount first & third motor facing top & the other two towards bottom

Sanjay
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« Reply #5 on: June 02, 2012, 10:23:50 AM »
hyd_quads
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That's something like Y4, Nah, That guy wants to build a QUADCOPTER. Grin

Vineet
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« Reply #6 on: June 02, 2012, 12:50:02 PM »
AEROVISHWA
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My views to

QUIZ 1

yes the weight is very important factor  may it be in  in head wind or in  the cross wind condition... specially in cross  wind. where if the weight is  less then  the plane will drift easily and will be difficult in getting it in line of the flight path. or the approach. in such case  more  crabbing will be required.

in case of  more weight since the air  speed  being low( wind is cross so no air flow  directly over the wing) u need to   have more ground speed  in order to avoid stall.... this may lead to a fast landing or a bit harder  one...  the weight does matter

thats why always on a plane i get the seat above the wing (may be to maintain the CG)  Giggle Giggle

QUIZ 2
u can cancel the torque effect by ...slightly   rotation of the motor against the direction of the torque. a slight rotation of even 1-2 degree will have a  efffect..
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« Reply #7 on: June 02, 2012, 01:34:47 PM »
rcpilotacro
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Ans to Quiz Number 1

The path that you follow on ground is called TMG (Track Made Good), in a crosswind condition your aircraft nose is to one side the difference between both is is called Track Error (TE), Drift correction Angle (DCA) is same as Track Error however reverse in sense (You apply DCA in opposite sense of TE to follow the desired TMG)

Formula for DCA (Modified for RC)

Drift Correction Angle =SIN-1 [(V/AS)SIN (W-Hdg)]


V=Wind Velocity
AS=Airspeed
W=Wind Direction
Hdg=Heading

if you notice this formula, there is no weight in this, what determines the Crab as it is called colloquially is the speed at which you carry out you approach to landing, weight has nothing to do with it,
here is my post on the same subject earlier

wind effect on an aircraft has nothing to do with weight.
DCA=SIN to the -1 [(V/TAS)SIN (W-TC)]

DCA=Drift Correction Error
V=Wind Velocity
TAS=True Airspeed
W=Wind Direction
TC=True Course

where is weight this, it is only the forward speed, sounds impossible but true, a huge passenger jet which lands at low speed has tremendous problem of landing, controlling, turbulence effect and what not, a fighter jet especially mig series ,  don't cater for wind at all.



Quiz on weight to wind effect

Next Quiz is
What is the effect that you see of wind on small, light weight aircraft, how do you prove yes weight does effect in some way

DCA & TE.jpg
Re: Quiz - relating to RC Flying and the 'How & Whys' of it
* DCA & TE.jpg (12.76 KB, 365x136 - viewed 457 times.)
« Last Edit: June 03, 2012, 05:33:12 AM by rcpilotacro » Logged

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A Great pilot will practice until he canít get it wrong.
 

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« Reply #8 on: June 02, 2012, 10:06:43 PM »
hyd_quads
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yes Aerovishwa.

That yaw effect can be cancelled by tilting a pair of opposite motors by 5-10degrees. If not, a combo a CW and CCW props is used.

Vineet
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