Info on the Bristol Britannia - Take-Off Run?
 

Hi there,
I'm new here so please let me know if I'm not conducting this thread in the right way, or whatever. :)

I'm an aeronautical engineering student and for one of my group projects this year I'm researching some of the turboprop airliners from the 50s and 60s. Long story short we're developing a concept design for a commercial turboprop that's geometrically & performance-wise similar to the DC-7 and the Il-18 Coot, to meet performance and design specifications requested by an imaginary client (i.e. our lecturer).

The problem is, one of these performance requirements is the take-off run at MTOW in standard met conditions at sea level. For all our other case studies we've found this value, but for the Bristol Britannia we can't find this characteristic anywhere online.

Would anyone here happen to know (even roughly, to the nearest 100m will do) the take-off run at MTOW for the Britannia 310 or 320 series?

Thanks a lot for the help!

This info should be easily available because the CAA performance (group A) exam was based on the Britannia, until about the late 70's.

This is for the 310...

http://i60.tinypic.com/x1ek4n.jpg

The Bristol Britannia XM496 Preservation Society is dedicated to the preservation of the XM496 Britannia Aircraft in Royal Airforce Livery

Perhaps these folks can help.

This any help?

http://www.vc10.net/Files/TN_TOperformancegraph.jpg

Ah, thanks a bunch everyone! Very good info. Checking out

Noyade, if possible could you tell me where you sourced that image/photocopy from?
As you probably understand, I have to be really meticulous with my references for this project.

Again, thank you very much!

HF - I have been a bit tied up, but have now found time to copy this graph from my Britannia 312 Ops Manual. Hope it helps.

http://i24.photobucket.com/albums/c3...psiapsbw3y.png

Britannia performance - take off run required
 

The difficulty here is that the Take Off Distance Available (TODA - paved run plus clearway over which to climb to a screen height) and the Take Off Run Available (TORA - paved surface alone) are different beasts, as is the Emergency Distance Available (EMDA - paved surface plus stopway on which to bring the aircraft to a halt). I do not remember ever having to calculate a Take Off Run Required as such in 30-odd years of wrestling with Group A performance on various types. The aim was to input the TORA, TODA and EMDA plus the density altitude, temperature, wind, slope etc in order to determine the maximum weight allowable to get the aircraft to the screen height (eg 35 or 50 ft above the first obstacle at the end of the TODA), having suffered an engine failure at V1 (decision speed). And the answer was always a weight and a speed, never a distance or the amount of tarmac from brakes-off to airborne. TORA and EMDA came into it certainly but you had to input them to the graphs, not calculate them from the graphs. Excuse my rusty memory; it's about 50 years since I studied Britannia 252/253 variant performance but I still have occasional access to a Vol 1 ODM courtesy of the XM496 Preservation Society should there be questions.

The World's Airliners. Peter W. Brooks. Putnam. 1962.