matt_k Posted November 3, 2010 Share Posted November 3, 2010 Whats the maximum constant wind speed you would flyin? Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 3, 2010 Share Posted November 3, 2010 depends if you want to go in to wind or down wind Quote Link to comment Share on other sites More sharing options...
matt_k Posted November 3, 2010 Author Share Posted November 3, 2010 all over, uppers downers all arounders! Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 3, 2010 Share Posted November 3, 2010 If it is a constant wind then it depends on your ground handling, It was blowing 18-22 mph when Simon and me took off on morning on the tip 2 tip. (had to catch up with the rest) 72mph down wind Quote Link to comment Share on other sites More sharing options...
aquatix Posted November 4, 2010 Share Posted November 4, 2010 Wind at ground level is probably the deciding factor, along with the trim speed of your wing (usually about 18mph) for safe launches & landings. Even if the wind speed is higher with altitude you can use trimmers or speed bar to make progress in smooth 25 mph laminar air no problem, or fly lower in the wind gradient. Its usually the opposite for free flying (on UK hills) as you can safely reverse launch in 18-20 mph winds knowing that it will probably only be 10-14 mph once you are out of the 'compression zone' at launch. Saying that, I'm a wuss with the motor and tend to launch when the wind is in single figures (on ground). Its one thing getting dragged with a nice airbag / foam protection harness on the hill, but not with a fragile, heavy & expensive motor on your back ! Quote Link to comment Share on other sites More sharing options...
padeakin Posted November 4, 2010 Share Posted November 4, 2010 Its usually the opposite for free flying (on UK hills) as you can safely reverse launch in 18-20 mph winds knowing that it will probably only be 10-14 mph once you are out of the 'compression zone' at launch. Compression Zone??? The venturi effect that you sometimes get on the hill is not a ‘compression zone’. The venturi effect actually lowers the pressure and increases the wind. Sorry to be pedantic but this is often incorrectly called a compression zone. and that is confusing. Paul D Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 4, 2010 Share Posted November 4, 2010 Its usually the opposite for free flying (on UK hills) as you can safely reverse launch in 18-20 mph winds knowing that it will probably only be 10-14 mph once you are out of the 'compression zone' at launch. Compression Zone??? The venturi effect that you sometimes get on the hill is not a ‘compression zone’. The venturi effect actually lowers the pressure and increases the wind. Sorry to be pedantic but this is often incorrectly called a compression zone. and that is confusing. Paul D Surly if the wind was being sucked over the hill then you would get a Venturi effect (as in a carb.) but with the wind blowing on to the hill and being forced up and over it is compressed between the hill and the air above thus causing the wind to back up/ build enabling you to fly farther out in front of the ridge, if it was a Venturi effect you would not get this!!!!!!!! Quote Link to comment Share on other sites More sharing options...
aquatix Posted November 4, 2010 Share Posted November 4, 2010 Sorry Paul - thats the bad habits of a certain club coach rubbing off on me !! I put it in commas to denote the colloquialism. Now perhaps you could educate him on the fictitious centrifugal force describes during steeply banked turns or spirals ...... Quote Link to comment Share on other sites More sharing options...
aquatix Posted November 4, 2010 Share Posted November 4, 2010 Surly if the wind was being sucked over the hill then you would get a Venturi effect (as in a carb.) The carb doesn't work from the engine suction - that just pulls air through it. It is the narrow venturi that causes the air to speed up, lowering pressure and thus drawing fuel through the jets. but with the wind blowing on to the hill and being forced up and over it is compressed between the hill and the air abovethus causing the wind to back up/ build enabling you to fly farther out in front of the ridge, if it was a Venturi effect you would not get this!!!!!!!! its certainly easier to visualise it as water flowing against and over a rock in a river, although Bernoulli wouldn't be too happy about it .... Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 4, 2010 Share Posted November 4, 2010 Venturi effect over the hill with a compression zone in front of the hill to be precise. Quote Link to comment Share on other sites More sharing options...
alan Posted November 4, 2010 Share Posted November 4, 2010 Aquatix " colloquialism" two shreddies for breakfast? Quote Link to comment Share on other sites More sharing options...
aquatix Posted November 4, 2010 Share Posted November 4, 2010 Just a bowl of alphabet soup & boredom with this crap weather .... Quote Link to comment Share on other sites More sharing options...
Neilzy Posted November 4, 2010 Share Posted November 4, 2010 So that answers it Matt simple Quote Link to comment Share on other sites More sharing options...
matt_k Posted November 4, 2010 Author Share Posted November 4, 2010 Jesus!!! i only wanted to know what wind strengths other people flyin!!! So where is the compression zone again? Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 4, 2010 Share Posted November 4, 2010 Quote Link to comment Share on other sites More sharing options...
aquatix Posted November 4, 2010 Share Posted November 4, 2010 Jesus!!! i only wanted to know what wind strengths other people flyin!!! Well I'm getting so desperate to fly that I'll take any wind up to 20mph providing its not (a) raining, (b) dark, © raining again ... So where is the compression zone again? According to the BHPA, here: Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 4, 2010 Share Posted November 4, 2010 told ya Quote Link to comment Share on other sites More sharing options...
matt_k Posted November 4, 2010 Author Share Posted November 4, 2010 Yes i hear ya with the need to fly! im gagging!! sunday is looking good though but its still two days away I can see why some tempt the stronger winds Quote Link to comment Share on other sites More sharing options...
pete_b Posted November 4, 2010 Share Posted November 4, 2010 Practise your ground handling in higher winds with a normal harness first with trims out, but make sure you are safe in case you get dragged Quote Link to comment Share on other sites More sharing options...
padeakin Posted November 4, 2010 Share Posted November 4, 2010 Practise your ground handling in higher winds with a normal harness first with trims out, but make sure you are safe in case you get dragged Yes but if handling in strong wind on a hill, be aware of the 'Zone of accelerated air flow' which you may find close to the hill (previously wrongly called the compression zone) Paul D Quote Link to comment Share on other sites More sharing options...
Neilzy Posted November 5, 2010 Share Posted November 5, 2010 So where is the compression zone again? Under me if i land on ya Quote Link to comment Share on other sites More sharing options...
matt_k Posted November 5, 2010 Author Share Posted November 5, 2010 Usually first thing in the morning for me, or when i hit turbulence! By the look on your face Neil compression zone is on take off! Quote Link to comment Share on other sites More sharing options...
garyfreefly Posted November 5, 2010 Share Posted November 5, 2010 I thought the compression zone had somthing to do with deep sea diving Quote Link to comment Share on other sites More sharing options...
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