PDA

View Full Version : Pardon my ignorance : What is Roll Rate ?



Capt._Tenneal
03-16-2004, 10:12 AM
Being not well versed on technical aspects of aircraft and flight physics (I know about basic characteristics like speed, climb rate, ceiling, etc.), I always read discussions in the boards, some heated ones too, about roll rates. What is it and how is it vital to an aircraft's performance ?

Is it an important factor in evaluating if one aircraft is better than another ? Is there an indicator of roll rate (like kph or mph for speed) ?

Thanks.

Capt._Tenneal
03-16-2004, 10:12 AM
Being not well versed on technical aspects of aircraft and flight physics (I know about basic characteristics like speed, climb rate, ceiling, etc.), I always read discussions in the boards, some heated ones too, about roll rates. What is it and how is it vital to an aircraft's performance ?

Is it an important factor in evaluating if one aircraft is better than another ? Is there an indicator of roll rate (like kph or mph for speed) ?

Thanks.

BlitzPig_Ritter
03-16-2004, 10:15 AM
Roll rate is just what it sounds like. Its how fast an aircraft can roll over. It's pretty important to combat aircraft as it is a major factor in maneuverability.

______________________________
Formerly Known as: Die_Ritterkreuz
http://ritterkreuz.freewebspace.com/images/sig3.jpg (http://www.il2skins.com/?action=list&authoridfilter=Ritterkreuz&ts=1067024271&comefrom=credits)
Now with 40+ skins and counting!

DONB3397
03-16-2004, 10:25 AM
I'm no expert either, but roll rate is reported in degrees (of roll) per second. Flat to inverted = 180 degrees, etc.

Fast roll rates (e.g. 190As) provide big advantages in DFs because they accelerate the entry and exit to maneuvers. Split S is quicker. Immelmans are tighter. Breaks are faster. Some pilots use defensive rolls into sharp breaks so the pursuing plane can't anticipate turn direction.

Overall, I'd rather have fast roll in a DF than dive...or even climb. Just an opinion.

http://us.f2.yahoofs.com/bc/3fe77b7e_1812a/bc/Images/Sig---1.jpg?BCIuMVAB.EuILZQo
There is no 'way' of winning;
There is only Winning!

Showtime_100
03-16-2004, 11:45 AM
I think when you see figures for it you are usually seeing the max roll rate the aircraft can deliver. Typically, due to weight, torque and momentum of an aircraft, it takes a second or two to actually get to your max roll rate. I believe the P38 would take longer to get to max than a Spit or FW, for example.

BlindHuck
03-16-2004, 12:03 PM
Also, roll rates are broken down into two forms: initial and sustained. The 152H and P-38 had high sustained but low initial roll rates. One 152 pilot said his plane was very slow to respond but once it got going was ok and, he said, it wasn't as bad as P-38. I have no idea how he made that comparison? Beute-Zirkus Rosarius? Their test flight data?

Hey - I'm have'n fun with AEP! http://ubbxforums.ubi.com/images/smiley/16x16_smiley-very-happy.gif

"I race full real exclusively in IL2:The Forgotten Battles." - Mark Donohue

F19_Ob
03-16-2004, 02:45 PM
Hmm....... I heard in an interview that the spitfire mk1 had half the rollrate of the bf109.



Well rollrate maters alot. The exellent roll of the p40 was what saved it from total slaughter by Zeros.
Zeros have very slow roll above 400km/h but the p40 had very good roll at high speeds and was thus able to change direction faster than zeros and able to avoid being shot down if caught or bounced.

http://ubbxforums.ubi.com/images/smiley/16x16_smiley-happy.gif