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I was busy mentally planning my kustom Volvo 240 panel van low rider last night. Obviously it'll be de handled and have nice suicide doors... which got me to thinking...
Why are suicide doors more likely top open?
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its the fact that when they do open on the go theyll blow open wide, and take you out too if you have no seat belt and vinyl seats!  IMO |
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 it doesn't matter if it's a Morris Marina or a Toyota Celica - it's what you do with it that counts  |
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airflow...
a 70 MPH draught against a conventional door makes it hard to open it (you are going against the air pressure) but in a reverse hinged door the air just needs to get in the lip and WHAM its ripped open. Or off as happened to a mate of a mate whith a ropey Rover P4 some years ago on the M6...
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1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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Scary but cool! whats the solution? just be tough or fit safety catches?
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it doesn't matter if it's a Morris Marina or a Toyota Celica - it's what you do with it that counts |
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Yeah, there are a variety of clatches and latches on the market which are far better than what was available in the 1930s, 1940s, 1950s.
Don't transport pished women who are arguing with their boyfriends and decide to get out of the car at 60 MPH...
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1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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airflow... a 70 MPH draught against a conventional door makes it hard to open it (you are going against the air pressure) ... On the contrary, it will fly open as the greater pressure is from the still air inside the cabin..... Its the wing principle, faster moving air on the outside of the surface creates a negative pressure relative to the inside surface.... Sideways "Lift" in effect Try it if you don't believe me  ;D Scared the hell out of me 1st time I tried it (at about 12 years old  ) My first lesson in / introduction to aerodynamics ;D HTH Dom |
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I've opened car doors (at moderate speed) and they don't seem to want to open. Like when you set off and the seat belt is caught in the door. I get what you're saying but maybe only when the door is actually openned a bit?
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1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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I thought the real problem with suicide doors was that if you opened one into traffic and a passing car caught it you'd probably be crushed or mutilated, whereas a conventional door would just be torn off.
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I've not found that normal doors will fly open because the hinge restricts it. On the other hand, at speed the air pressure can quite easily pull the top of the door out of line away from the door seal |
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MWF
Posted a lot
Posts: 2,945
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I've heard about rusty old Escorts having their sunroofs pop out at speed before.
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Jez
Part of things
Posts: 517
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I'm not really sure why they're more likely to open, but maybe it's worth looking at the Mazda RX-8 or the new Rolls Royce for a solution?
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1990 VW Golf GTI G60
2014 Skoda Octavia RS
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rod
Posted a lot
Posts: 1,953
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I think this may have come about when the old cars ,with coach built wood (ash)etc frames had these doors . p'raps they tended to fly open when the body moved on the chassis ,hence 'suicide doors' ??
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tigran
Club Retro Rides Member
In rust we trust. Amen.
Posts: 6,444
Club RR Member Number: 142
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Suicide doors vs. physics?tigran
@tigran
Club Retro Rides Member 142
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I'm not really sure why they're more likely to open, but maybe it's worth looking at the Mazda RX-8 or the new Rolls Royce for a solution? "Yeah ello is this bob's scrappie?" "Yeah just wondering if you've ad any of those Royce Phantom things in lately...yeah just want a door hinge and a latch, ta." |
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1964 Rover P5 i6
1987 BMW 525e - The Rusty Streak
1992 Micra K10
2001 BMW E46 316i
2002 BMW E46 330Ci
2013 BMW F31 320d
2018 BMW G31 530d
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Mr K
Posted a lot
Posts: 2,993
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airflow... a 70 MPH draught against a conventional door makes it hard to open it (you are going against the air pressure) ... On the contrary, it will fly open as the greater pressure is from the still air inside the cabin..... Its the wing principle, faster moving air on the outside of the surface creates a negative pressure relative to the inside surface.... Sideways "Lift" in effect Try it if you don't believe me ;D Scared the hell out of me 1st time I tried it (at about 12 years old ) My first lesson in / introduction to aerodynamics ;D |
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RX8 wll be fine as the front doors lock the rears and the rears hide under the fronts, I think. so not much chance of air pushung in and opening. not sure if they'd pop open in a roll or not though, probs not. put your hand out of the window or sunroof at speed (be carful) feel the pressure! imagine what that would do to a big back wards door presented to the pressure. plane brakes use the same principle don't they. except the door would just fly back or fly off. |
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it doesn't matter if it's a Morris Marina or a Toyota Celica - it's what you do with it that counts |
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the fronts lock the rears? you sure?
so if you have a crash, and are knocked out, kids in the back cant open the doors to escape?
surely not ....
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it doesn't matter if it's a Morris Marina or a Toyota Celica - it's what you do with it that counts |
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425ci
Part of things
Posts: 518
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airflow... a 70 MPH draught against a conventional door makes it hard to open it (you are going against the air pressure) ... On the contrary, it will fly open as the greater pressure is from the still air inside the cabin..... Its the wing principle, faster moving air on the outside of the surface creates a negative pressure relative to the inside surface.... Sideways "Lift" in effect I disagree. The effect of the pressure differential is negligible when taking into account factors such as the volume of the pressurized air inside the car. The volume of air inside the car would not be sufficient and at a high enough pressure. If your theory was correct the door would fly open even if it was front-hinged. But because the rest of the car is closed, it wouldn't be able to sustain the effect. Alistair was correct. When opened at speed, the pressure on the forward-facing surface of a rear-hinged door would be sufficiently greater than that of the rear-facing surface, so it would open. The same cannot happen with a front-hinged door as the required high pressure on its inner surface isn't sustainable. Mike :-) |
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Current vehicle: Mountfield Mirage 3.5hp (18" cut)
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Odin
Posted a lot
Posts: 1,406
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the fronts lock the rears? you sure? so if you have a crash, and are knocked out, kids in the back cant open the doors to escape? surely not .... I'm pretty sure the edge of the rear door forms the jamb for the fronts, and has part of the lock mounted to it. It's no more dangerous than a 3-door, surely? |
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IMO
;D
) My first lesson in / introduction to aerodynamics ;D
hmmm
