RC India
Welcome Guest, please login or register.
 
Pages: [1]   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« on: February 28, 2013, 10:42:34 AM »
vishalrao
Plane Lover
Forum Hero

*****

Reputation Power: 9 
vishalrao has no influence.
Offline Offline

City: Mangalore
State: Karnataka
RC Skills: Intermediate
Posts: 617
Join Date: Nov, 2011

Plane Addict




Just came across this interesting video where the author describes about what causes stalls and how to recover from them. Strangely, the only thing that the author suggests to recover from a stall is to release the elevator sticks! Although I have never recovered from a stall yet, I'm finding this advice difficult to digest and experiment on my plane. Any expert inputs are welcome.

http://www.rcpowers.com/community/threads/beginners-flight-school-stalls.4056/
Logged

 

Read
« Reply #1 on: February 28, 2013, 11:09:23 AM »
asinghatiya
Plane Lover
Forum Hero

*****

Reputation Power: 12 
asinghatiya has no influence.
Offline Offline

City: Gurgaon
State: Haryana
RC Skills: Intermediate
Posts: 913
Join Date: Sep, 2010



to recover from a stall is to release the elevator sticks!
http://www.rcpowers.com/community/threads/beginners-flight-school-stalls.4056/


Absolutely its the only way to recover Stall! I tried manytimes on models too! Elevator is the only reson when applied at lower speeds push the aircraft to enter a stall!! Releasing it will provide the threshold speed to recover and keep the model floating!! Try it in Filght Simulator with a Boeing.
Logged

:-)
 

Read
« Reply #2 on: February 28, 2013, 11:14:31 AM »
vishalrao
Plane Lover
Forum Hero

*****

Reputation Power: 9 
vishalrao has no influence.
Offline Offline

City: Mangalore
State: Karnataka
RC Skills: Intermediate
Posts: 617
Join Date: Nov, 2011

Plane Addict



Thank you asinghatiya sir! I had forgotten about my simulator Smiley

What if there isn't sufficient altitude and the plane goes in a spin? I guess it'll be too late for the plane to recover by itself.
Logged

 

Read
« Reply #3 on: February 28, 2013, 11:17:11 AM »
asinghatiya
Plane Lover
Forum Hero

*****

Reputation Power: 12 
asinghatiya has no influence.
Offline Offline

City: Gurgaon
State: Haryana
RC Skills: Intermediate
Posts: 913
Join Date: Sep, 2010



What if there isn't sufficient altitude and the plane goes in a spin?

Thanks!!

 >Cheesy Remember the GOD you beleive and pray that your eject seat is working properly!!
Logged

:-)
 

Read
« Reply #4 on: February 28, 2013, 11:20:44 AM »
vishalrao
Plane Lover
Forum Hero

*****

Reputation Power: 9 
vishalrao has no influence.
Offline Offline

City: Mangalore
State: Karnataka
RC Skills: Intermediate
Posts: 617
Join Date: Nov, 2011

Plane Addict



 Giggle I'm lot relieved now as there's nothing much I can do for stalls at low altitudes except to actually prevent the stall from coming  Grin
Logged

 

Read
« Reply #5 on: November 11, 2013, 10:26:16 PM »
shobhit17
Plane Lover
Forum Hero

*****

Reputation Power: 12 
shobhit17 has no influence.
Offline Offline

City: New Delhi
State: Delhi
RC Skills: Intermediate
Posts: 808
Join Date: Dec, 2012



well... the aerodynamics of stall are not so simple.... Stall is a state of flight when the wing is unable to develop enough lifting force to suport the weight of the plane and the plane simply falls from the sky.  A well balanced plane will always have its CG slightly ahead of the actual required CG position.  This has two advantages....
1.  The plane remains controlable as a heavier nose makes the plane more stable and helps controlability.  An aft CG makes the plane unstable and thus at times uncontrolable.  Hoever there are limits of how heavy the nose should be.
2.  Now whenever you have an engine failure or experience a stall..... the heavier nose plane will have a natural tendency to go nose down and in a dive.  Thus often recovering from the stall all by itself.

NOW...
To recover from a stall... put the plane in a slight dive to build up speed over the basic stalling speed (Basic Stalling Speed is the speed at which a wing is unable to produce sufficient lifting force to sustain the plane in a straight and level flight and the plane thus starts to loose height rapidly.  This speed can be reached in straight and level flight in case the throttle is reduced very low and the plane continues to fly straight and level, thus to maintain the required amount of lift its Angle of Attack will need to be increased and at a particular point it will cross the stalling angle.  This speed at which is state occurs is called as the basic stalling speed).  As the speed builds up in the dive increase throttle and use the elevator to recover from the dive.

OK.... A stall can take place even at higher speeds.... i.e. during turns and High G manouvers.  as a thumb rule in a 60% turn increases the Basic Stalling Speed by 100 %.  i.e. a plane stalls at twice the speed if you are doing a turn with 60% bank in a level flight.  In high G manouvers the plane can be stalled almost anytime.... recovery actions are to get wings level, relax the up elevator to reduce the G loading.... if required put the plane in a shallow dive.  The plane will itself recover from the stalled state.

NOW.... increase power and take control of the plane again.

In case flying gas / turbine engines.... you got to be very carefull during stalls as the engine too might be forced to stall (something called as an engine surge in jet engines).  In thus condition the engine temperature increases rapidly due to unsteady airflow through the engine and may cause melting of engine parts..... causing permenant damage to the engines.

 So never do anything funny close to ground.... MUST always have sufficient sky between the plane and the ground.. for it to recover and continue flying....

Aerodynamics helps...... Happy Flying
« Last Edit: November 11, 2013, 10:37:00 PM by shobhit17 » Logged

Well I been into aeromodelling since I was in School....  and then been in the air for over 30 years.  Now looking to be back into aeromodelling full time...
 

Pages: [1]   Go Up
Jump to:  

Related Topics
Subject Started by Replies Views Last post
A self recovering flying bot
Chatter Zone
anwar 0 1463 Last post March 06, 2013, 10:56:12 PM
by anwar
Interesting Episodes of Recovering your RC Equipments « 1 2  All »
RC General Topics
rcpilotacro 33 10599 Last post June 06, 2013, 04:00:25 PM
by punty