Brainteaser | Jokes & Fun | Ford Fiesta ST

Ford Fiesta ST

You are not logged in. [Log In] Ford Fiesta ST » Forums » Off Topic » Jokes & Fun » Brainteaser

Page 2 of 3

2

Topic Options

Rate This Topic

#45028 - 15/05/06 01:11 PM Re: Brainteaser [Re: MichaelST1]
David_Hallam Regular Registered: 03/05/06 Posts: 51 Loc: Blackpool	Because the guy has bought a ST _________________________ David Hallam
Top

#45029 - 15/05/06 02:41 PM Re: Brainteaser [Re: David_Hallam]
KevinClark Fiesta Addict Registered: 11/03/04 Posts: 944 Loc: Oxford	Here's one I've seen raging on several forums.... A plane is standing on runway that can move (some sort of band conveyer). This conveyer has a control system that tracks the tire speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction). The question is: Will the plane take off or not? _________________________ Scirocco Central My Diecast Model Car Forum
Top

#45030 - 15/05/06 02:55 PM Re: Brainteaser [Re: KevinClark]
David_Hallam Regular Registered: 03/05/06 Posts: 51 Loc: Blackpool	yes _________________________ David Hallam
Top

#45031 - 15/05/06 03:07 PM Re: Brainteaser [Re: David_Hallam]
crofty136 Fiesta Nutter Registered: 16/10/05 Posts: 1478 Loc: Leeds	No, the plane wont have amy momentum... its just standing still Also the plane will push itself off the conveor because its not the wheels turning (so you wont get a rolling road effect), its the jets that push it along. thats what i think anyway!
Top

#45032 - 15/05/06 06:27 PM Re: Brainteaser [Re: crofty136]
Gareth Fiesta Nutter Registered: 22/07/05 Posts: 2274 Loc: NW London	No the plane won't take off as there is no air flow over the wings. _________________________
Top

#45033 - 15/05/06 06:49 PM Re: Brainteaser [Re: Gareth]
KevinClark Fiesta Addict Registered: 11/03/04 Posts: 944 Loc: Oxford	Ah but the engines are pushing against the air which is not in contact with the conveyor belt as such. Theoretically you could start the belt moving and due to inertia the plane would stay still. The wheels and belt could happily be doing 100mph.......then you turn the engines on. Thrust. Pushing against the air, not the belt. Forward motion. Therein lies the mahoosive arguments I've seen on this _________________________ Scirocco Central My Diecast Model Car Forum
Top

#45034 - 15/05/06 07:15 PM Re: Brainteaser [Re: KevinClark]
Gareth Fiesta Nutter Registered: 22/07/05 Posts: 2274 Loc: NW London	Yes but the plane still needs forward movement to get the necessary airflow to create lift, although the wheels/conveyor may be doing 100mph the airspeed on the wings would be zero (assuming there is no wind). Due to the fact that the conveyor belt matches the wheel speed, it would be impossible for the plane to generate any forward movement. Up until take off speed (air speed over the wings) the wheels are necessary to allow the plane to move, one the wings are generating enough lift to take off, then the wheels become redundant. _________________________
Top

#45035 - 15/05/06 07:54 PM Re: Brainteaser [Re: Gareth]
DeKris Fiesta Fan Registered: 11/03/06 Posts: 230 Loc: Belgium, Kempen	I 'm sorry Gareth, but i don't think the wheels mather, there isn't a motor on the wheels. there's only a propeller or jet engine. _________________________
Top

#45036 - 15/05/06 09:04 PM Re: Brainteaser [Re: DeKris]
KevinClark Fiesta Addict Registered: 11/03/04 Posts: 944 Loc: Oxford	Quote: I 'm sorry Gareth, but i don't think the wheels mather, there isn't a motor on the wheels. there's only a propeller or jet engine. Bingo! The engine thrust is acting on the air, not on the wheels. Or is it.... _________________________ Scirocco Central My Diecast Model Car Forum
Top

#45037 - 15/05/06 09:57 PM Re: Brainteaser [Re: KevinClark]
Gareth Fiesta Nutter Registered: 22/07/05 Posts: 2274 Loc: NW London	Quote: The engine thrust is acting on the air, not on the wheels. True, but the wheels are needed to allow the plane to travel down the runway and up to "take off" speed (fast enough air flow over the wings to achieve lift) The key to this brainteaser is this. Quote: This conveyer has a control system that tracks the tire speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction). No matter how much thrust the engines are putting out, the conveyor belt is not allowing the plane to move, therefore there will be no airflow over the wings and thus the plane can't take off. Remember the key to a plane being able to take off & fly is air flow over the wings, in this situation (unless it's in a wind tunnel) there will never be enough air flow over the wings to create lift for the plane to fly. _________________________
Top

#45038 - 15/05/06 10:37 PM Re: Brainteaser [Re: Gareth]
KevinClark Fiesta Addict Registered: 11/03/04 Posts: 944 Loc: Oxford	But the conveyor isn't counteracting the thrust. It's only acting on the wheels and they have no direct drive. See this is why the last forum I saw it on went to 9 pages and nearly 250 posts _________________________ Scirocco Central My Diecast Model Car Forum
Top

#45039 - 15/05/06 10:52 PM Re: Brainteaser [Re: KevinClark]
Gareth Fiesta Nutter Registered: 22/07/05 Posts: 2274 Loc: NW London	Here we go....the thrust (coming out of the back of the engine) is to push the plane forward at speeds great enough that the air speed over the wings creates lift, in this case the conveyor belt does not allow any forward movement and therefore no take off. If the wheels are unimportant, why does nearly every plane in the world have them. They are an essential part in allowing the plane to travel forwards. _________________________
Top

#45040 - 15/05/06 11:02 PM Re: Brainteaser [Re: Gareth]
MattyST Fiesta Fan Registered: 10/05/06 Posts: 228 Loc: Essex	i have another one guys: a man digs up 2 perfectly preserved. He doesnt know what to do so asks a fellow time team digger, and they say CHRIST thats adam and eve!!!!! how does he know that?????????????????? _________________________ FIESTA Mattyi26@hotmail.com
Top

#45041 - 15/05/06 11:12 PM Re: Brainteaser [Re: Gareth]
crofty136 Fiesta Nutter Registered: 16/10/05 Posts: 1478 Loc: Leeds	hmm... weels help it move, but the plane is still gonna push itself along cos of the thrust from the engine. if the plane was on the runway with no wheels it could still move if you applied enough thrust
Top

#45042 - 16/05/06 09:49 AM Re: Brainteaser [Re: Gareth]
KevinClark Fiesta Addict Registered: 11/03/04 Posts: 944 Loc: Oxford	Quote: Here we go....the thrust (coming out of the back of the engine) is to push the plane forward at speeds great enough that the air speed over the wings creates lift, in this case the conveyor belt does not allow any forward movement and therefore no take off. If the wheels are unimportant, why does nearly every plane in the world have them. They are an essential part in allowing the plane to travel forwards. But the conveyor isn't acting against the thrust of the engines. It's counteracting the speed the wheels are rolling at. _________________________ Scirocco Central My Diecast Model Car Forum
Top

Page 2 of 3

2

View All Topics

Hop to:

Moderator: Duncan_P, kenny, Kev

Search

0 registered (), 1131 Guests and 0 Spiders online.

Key: Admin, Global Mod, Mod

Shout Box

Featured Member

Hartmann846

Hartmann846

Registered: 11/06/26
Posts: 4

Today's Birthdays

No Birthdays

Newest Members

Zoe Fiesta, Chunzliu, dangyc, Calvin, degobaj55
8606 Registered Users

Top Posters (30 Days)

ChrisCumbria	12
Hartmann846	4
Chunzliu	3

Top Posters

ROB IS THE STIG	50824
ChrisCumbria	23932
Scotty	18100
Adam08	15118
Alex_H	15061
kenny	11807
YellowBadge	11640
steviehouse	11614
babyboom	11557
Micky	11552

June
M	Tu	W	Th	F	Sa	Su
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30

Forum Stats

8607 Members
50 Forums
32288 Topics
561545 Posts

Max Online: 14753 @ 28/02/26 08:23 AM