Doug Posted November 12, 2008 Share Posted November 12, 2008 Sevens unquestionably look much better without doors and are far more fun to drive, if you don't mind the incredible buffetting! I've tried using the official perspex side screens but they don't make a significant difference. A perennial problem area this, I do realise. Given that putting full doors on virtually eliminates the problem, it would seem that the airflow around the sides of the windscreen is at the root of the problem... or am I mistaken? There is clearly an aerodynamic fault somewhere (Yeh, I know the Seven isn't great in this respect) and wonder if anyone has determined where this fault lies? Is it that the screen itself is not optimised in some respect (rake perhaps?) or is there more to it that this. Perhaps a screen behind the seats such as the one made by Soft bits for Sevens might help. It would be interesting to know if a Seven has ever been in a wind tunnel to see where the buffetting originates from. 'Have you any idea what it's like to have the wind rushing through your hair!' (Quote:Sq Cdr the Lord Flashheart) Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted November 12, 2008 Leadership Team Share Posted November 12, 2008 The cause is simple - flat screen. The cure is rather more complex! Most owners have settled on either of 2 choices - screen and doors, or aeroscreen. It may be possible to bring in other ideas to use the screen alone but much experimenting is needed. I did wonder at one time whether a vent feeding air to the inside-central area of the screen might help to increase the pressure (ie. reduce the suction effect behind the screen). Stu. Joint Area Representative MAD Sevens (Merseyside And District) www.superse7ens.co.uk..........the rebuild 😬 Link to comment Share on other sites More sharing options...
Johnty Lyons Posted November 12, 2008 Share Posted November 12, 2008 Half hood and Sb47 draught excluder works a treat jj N.I. L7C AR 🙆🏻 Membership No.3927. 240BHP 1900cc K Series 40th Anniversary Link to comment Share on other sites More sharing options...
Jason Plato Posted November 12, 2008 Share Posted November 12, 2008 you could always take the glass out of the windscreen ? 😬 here is C7 TOP Taffia joint AO with Al Link to comment Share on other sites More sharing options...
Area Representative Golf Juliet Tango Posted November 12, 2008 Area Representative Share Posted November 12, 2008 larger than standard polycarbonate wind deflectors? Democratic dissent is not disloyalty, it is a positive civic duty. Link to comment Share on other sites More sharing options...
Doug Posted November 12, 2008 Author Share Posted November 12, 2008 Stu, I did wonder if it was something like that. Sports cars in the 20s and 30s all had a similar set up and don't seem to suffer from the same problem. I've done many miles in a 30s HRG and never get buffeted in the way I do in the Seven without doors! The HRG has a flat screen too which was what made me wonder about rake or even windscreen height. It would be very interesting to see how air behaves around the screen in a wind tunnel... 'Have you any idea what it's like to have the wind rushing through your hair!' (Quote:Sq Cdr the Lord Flashheart) Link to comment Share on other sites More sharing options...
Bilbo Posted November 12, 2008 Share Posted November 12, 2008 I think that Brooklands give better wind protection than the areoscreen and no buffering thats to say windy but not the same effect as wind round the side of the mainscreen buffering with the air over the top 'Can you hear me running' ......... OH YES and its music to my ears 😬 😬 😬 1988 200 bhp, 146 ft lbs, 1700cc Cosworth BD? engineered by Roger King, on Weber's with Brooklands and Clamshell wings, Freestyle Motorsport suspension. Link to comment Share on other sites More sharing options...
Beelzebub Posted November 13, 2008 Share Posted November 13, 2008 Anyone tried a leather flying helmet 🤔 Link to comment Share on other sites More sharing options...
John Howe Posted November 13, 2008 Share Posted November 13, 2008 Each to their own but for me Brooklands and c/fibre half doors work, and, surprisingly dry in the wet - assuming you are not in standing traffic JH Deliveries by Saffron, the yellow 230bhp Sausage delivery machine Link to comment Share on other sites More sharing options...
Alex Wong1697456877 Posted November 13, 2008 Share Posted November 13, 2008 If you take an air gun and warm up the perspex on the wind deflectors and slowly increase the bend in them, you can get them to stick out more - try driving with them and hold the drivers one out with your hand - it makes quite a difference. You may need to reposition the rubber pad to stop it scratching the car though. ----- VDU 7X Pics More VDU 7X Pics Link to comment Share on other sites More sharing options...
Bilbo Posted November 13, 2008 Share Posted November 13, 2008 Anyone tried a leather flying helmet OH yes but......... Well when I bought my Ivin flying jacket I tried on the matching sheepskin pilots helmet... the wife pinched me cheek and said “who’s a cheeky chappy” then fell about with laughter when said so it does not suite me…. I tried on the leather one by then she had the lady assistant laughing ...we left with just the jacket and SHMBO saying I wished we had brought a camera. Having said that it/they are good idea… if...... 'Can you hear me running' ......... OH YES and its music to my ears 😬 😬 😬 1988 200 bhp, 146 ft lbs, 1700cc Cosworth BD? engineered by Roger King, on Weber's with Brooklands and Clamshell wings, Freestyle Motorsport suspension. Edited by - Bilbo on 13 Nov 2008 22:11:03 Link to comment Share on other sites More sharing options...
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