RC India

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

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 !!

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.  8-)  just guessing.  >:D

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

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

Sanjay

That's something like Y4, Nah, That guy wants to build a QUADCOPTER. ;D

Vineet

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..

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



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

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