*


All times are UTC + 1 hour



Post new topic Reply to topic
 [ 149 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6 ... 15  Next
Author Message
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 1:58 am 
Offline
Very Frequent Poster
User avatar

Joined: Fri Jul 16, 2010 6:27 am
Posts: 2466
Location: Ford Lake, Michigan
robertovillate wrote:
Someone suggested it takes 50 pump strokes to inflate a big kite...Not sure what kind of pump he's using but I would say more like 100+ strokes to get proper pressure in a 12m or larger kite.


not 50 pumps on a large kite to get to 8psi, 50 pumps to to "loosely inflate" i.e. you are pumping your kite up to 1 bar = 1 atmosphere or 14.5 psi or 0 psi relative to local air pressure. The kite when loosely inflated will not hold its shape at all but it will have air in it.

Then to get to 8psi, you want to pump 8/14.5 times however much it took to loosely inflate, or 28 more pumps more for 78 pumps to get to 8psi, it's a convenient way to calculate air pressure of your kite without a gauge. If you kite is in fact loosely inflated at 50 pumps and you pump it 100 times you are putting in a pressure of 14.5 psi. That is an extremely hard kite.

Most kite manufacturers ship terrible pumps with bad leaky valves or pumps that only last a week or two before they start leaking. I've had great luck with this $11 pump from walmart the "air head" pump, best hand pump I've ever had.


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 2:57 am 
Offline
Very Frequent Poster

Joined: Wed Aug 14, 2002 1:00 am
Posts: 1482
Location: PASA Level III Instructor FL- OBX - MI - the world
edt wrote:
robertovillate wrote:
Someone suggested it takes 50 pump strokes to inflate a big kite...Not sure what kind of pump he's using but I would say more like 100+ strokes to get proper pressure in a 12m or larger kite.


Then to get to 8psi, you want to pump 8/14.5 times however much it took to loosely inflate, or 28 more pumps more for 78 pumps to get to 8psi, it's a convenient way to calculate air pressure of your kite without a gauge. If you kite is in fact loosely inflated at 50 pumps and you pump it 100 times you are putting in a pressure of 14.5 psi. That is an extremely hard kite.


Maybe in a perfect world you could calculate pressure this way, but temperature differences, pump size, full or incomplete strokes, etc. would make this impossible to rely on. In the end you need to be able to ping the kite/feel the kite with your hand to know if it's hard enough.

In the old days we were afraid of over-inflating and exploding the leading edge, but these days the kites can handle 8psi easily. :pump:

Otherwise I seriously doubt anyone weighing under 250 lbs could ever pump a kite to 14psi without completely exhausting themselves (and unnecessarily). I would say at 8 psi it is quite a struggle for most people. I see a lot of underinflated kites in the air...and kites fly like shit when even slightly soft. (unless it's a foil :wink: )


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 3:24 am 
Offline
Medium Poster

Joined: Sun Sep 05, 2004 7:31 pm
Posts: 60
Location: Victoria, Canada
Anyone familiar with the "Island Inflator Pumps" from BoatsToGo.com ?
Just wondering about reliability. They are a bit cheaper than the Bravo BST pumps.
Thanks.


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 3:43 am 
Offline
Very Frequent Poster
User avatar

Joined: Sat Jun 26, 2004 7:41 pm
Posts: 2479
Location: Mtn View, CA (S.F. Bay)
robertovillate wrote:
kites fly like shit when even slightly soft. (unless it's a foil :wink: )


In which case they always fly like shit. (sorry - couldn't resist).


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 4:34 am 
Offline
Frequent Poster
User avatar

Joined: Thu Jul 09, 2009 7:24 pm
Posts: 384
pumping is my warm up before I kite.

its good for you. unless you have a back condition that prevents you from being physically able to pump your kite, quit bitching. its good for you, kiting isn't for lazy people anyway.

having a good pump makes all the difference too. if your pump seals leak then you will have to pump an unnecessary amount.

I've had the best results with the cheapo $9.88 Coleman pumps you find at walmart.

I think the plastic shaft is smoother and doesn't require grease like the aluminum shafts. My thought is the smooth plastic doesn't wear on the rubber bushings as quickly as the aluminum shafts do. If you are in a sandy environment this effect is even more apparent by the lack of sticky lubricant that you would find on an aluminum shaft pump. the sticky grease seems to attract sand like a magnet. as some of you have probably found as well. once sand gets in your pump, its days are numbered.

they might even be easier to recycle considering there is no metal parts.

I think its kinda funny that the cheapo walmart option seems like the green and low cost option. cant say that everyday :lol:


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 6:03 am 
Offline
Very Frequent Poster
User avatar

Joined: Sat Jun 26, 2004 7:41 pm
Posts: 2479
Location: Mtn View, CA (S.F. Bay)
Edited: I completely misread the above.


Last edited by spork on Fri Apr 15, 2011 6:55 am, edited 1 time in total.

Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 6:53 am 
Offline
Very Frequent Poster
User avatar

Joined: Fri Jan 09, 2009 4:49 am
Posts: 3634
Location: Japan
So that'd be a big plus one for the Foil Win huh? :lol:


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 6:57 am 
Offline
Very Frequent Poster
User avatar

Joined: Mon Sep 24, 2001 1:00 am
Posts: 29560
Location: World (KF Admin)
you don't need an electrical pump for smaller kites. A 16 is a different story, specially when you are in warm areas of the world. Laying out lines already makes me sweat!
But in colder areas like Germany I pump my kite manually, a really good warm up before going out.


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 1:45 pm 
Offline
Rare Poster
User avatar

Joined: Sun Oct 26, 2008 8:32 pm
Posts: 21
Location: Chicago
Spork I agreed with your pre-edited post.

C Johnson how is pumping your kite good for you? Not sure what school of ergonomics you went to. Lumbago (nonspecific low back pain) is a big f'n deal. Anything that preserves my energy/strength/low back for actual kitesurfing I'm all for.


Top
Profile
 Post subject: Re: Eletric Kite Inflation
PostPosted: Fri Apr 15, 2011 8:53 pm 
Offline
Frequent Poster
User avatar

Joined: Thu Jul 09, 2009 7:24 pm
Posts: 384
I was told by a PHD physical therapist / kiteboarder who has written her own kiteboarding fitness book that it is a great way to warm up. (e.g. gets the blood flowing, stretches your back, etc). What are your credentials to say it's not healthy?

If you are going to live your life according to an ergonomics manual you probably shouldn't kiteboard at all. Pumping a kite isn't a day in day out 8hr a day job like sitting in a desk chair or typing on a keyboard or lifting boxes. its something you do for a couple minutes once or maybe twice per session. I find it hard to believe the amount of exposure would constitute an ergonomics issue. if you are that concerned about it I would highly recommend stretching and doing a prewarm up before you pump your kite.

I think it is important to try and exercise good posture when pumping your kite. its easy to slouch, throw your back into it etc. I'm no expert but it seems like if you bend at the hips and keep your back as straight as possible, maybe even put your arms into the pumping motion more then your back. again if you have a back injury that prevents you from pumping then so be it. I personally think its a great way to warm up but then again I ride almost 99% of the time in cold water.

I can understand how pumping a 16m+ kite in 90degree weather could be brutal though. good call Toby.


Top
Profile
Display posts from previous:  Sort by  
Post new topic Reply to topic
 [ 149 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6 ... 15  Next

All times are UTC + 1 hour


Who is online

Users browsing this forum: Bing [Bot], troy1966 and 20 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group