revtothelimit - motorbike forum

The Spin Doctor wrote: Tue Nov 28, 2023 5:22 pm

Yorick wrote: Tue Nov 28, 2023 3:39 pm Lancaster Bombers could do it apparently

Avro Lancaster PA474 heavy bomber WW2 Second World War Dambusters Raid Royal Air Force Battle of Britain Memorial Flight BBMF CREDIT Crown Copyright.jpg

Photoshop

This is what happens when a B52 banks too steeply.

Photoshop?

No. YorickPhoneShop

Yorick wrote: Tue Nov 28, 2023 2:59 pm Aha. How do planes fly upside down?

Badly.

One theory about the origin of the expression 'going pear shaped' was pilots trying to fly a loop but having the top flatten.

Now you tell us why most helicopters can't do a barrel roll

The Spin Doctor wrote: Tue Nov 28, 2023 3:23 pm

Yorick wrote: Tue Nov 28, 2023 2:59 pm
Aha. How do planes fly upside down?

Badly.

AFAIK the aerofoil of your average plane wing is designed to produce optimum lift right way up, so you can't simply turn it upside down and expect it to fly. However, there are control surfaces which disrupt or enhance lift.

Stunt planes have - and I'm sure someone will correct me - aerofoil surfaces which are closer to symmetrical.

Partly why Douglas Bader crashed back in the day and lost his legs .....did a slow barrel roll but started it too low while showing off and didnt account for the loss of lift when the wing was crossing over the upside down part of the roll. Ended up in a tangle of wreckage

Sans bikes, but...

Bigyin wrote: Tue Nov 28, 2023 10:46 pm Partly why Douglas Bader crashed back in the day and lost his legs .....did a slow barrel roll but started it too low while showing off and didnt account for the loss of lift when the wing was crossing over the upside down part of the roll.

And showing why 'rules are for the
obeyance of fools, and the guidance of wise men' isn't always good advice. They had a rule about the minimum height for certain manoeuvres.

@The Spin Doctor will be along shortly to quote from the subsequent tribunal

As an aside, a mate (LabRat on Visordown) apprenticed as a saddler. He occasionally repaired DB's 'spare legs' bags. Said he was a miserable ... chap.

Boeing famously did a barrel roll in an 'airliner', the plane which preceded the 707 as a tech demonstrator. So it can be done. Might want to stow your tray table first though.

Because I was inverted.

Mr. Dazzle wrote: Wed Nov 29, 2023 7:38 am Boeing famously did a barrel roll in an 'airliner', the plane which preceded the 707 as a tech demonstrator. So it can be done. Might want to stow your tray table first though.

He says it's a "1g manoeuvre" so your drink might be ok.

Horse wrote: Wed Nov 29, 2023 8:01 am

Mr. Dazzle wrote: Wed Nov 29, 2023 7:38 am Boeing famously did a barrel roll in an 'airliner', the plane which preceded the 707 as a tech demonstrator. So it can be done. Might want to stow your tray table first though.

He says it's a "1g manoeuvre" so your drink might be ok.

There's a video somewhere of a pilot in a light jet (Lear or similar), flying a nice smooth barrel roll, while pouring water from a jug into a glass. He managed to do it while you can see the horizon rotating through the cockpit glass.

Edit : here it is :

I think I remember reading that Bob Hoover was the test pilots' test pilot.

I've been going through old photos that we've found - Isle of Man, I'm guessing 1977?

Before you make fun of my hair I'll point out my brother's.

Failing that I appear to be armed.

Is that on YouTube?

Horse wrote: Sun Dec 10, 2023 5:29 pm Is that on YouTube?

Commitment





P.s. if it’s been up before apologies as I didn’t trawl through 34 pages to check

Is the bike moving in that pic, it looks a bit of a staged static shot.

Le_Fromage_Grande wrote: Sun Dec 10, 2023 11:11 pm Is the bike moving in that pic, it looks a bit of a staged static shot.

https://aficyclesbmw.com/

Has ...



Which is the same but different. Interesting / sloppy(?) that the editor took 'RST' off the shoulder but not the knee.

And, for comparison:
viewtopic.php?p=160802&hilit=Scuff#p160802

Trying to work that that is on the right hand side of the back wheel? Also found this picture...

Taipan wrote: Mon Dec 11, 2023 5:12 pm Trying to work that that is on the right hand side of the back wheel? Also found this picture...

1. Belly pan? In shadow.
2. Scroll back up a couple of posts