KR> Bellybrake

[Herbert Fürle]

..my bellyboard turns down to about 80 deg. and after  talking to some 
aerodynamicists and some practical trials I decided to let the board without 
holes.
The tests I made  are very simple.I took a foamsheet ( 1 meter x 1 meter x 5 
mm) ,fixed  5 strings to the edges and the center with  a weight (about 100 
grams ) and used my "parachute" as testdummy.
I dropped  the dummy  from my ten meter high rooftop (5 trials without holes 
and 5 trials with holes) and  compared the times I measured.
It was easy to recognice  that the board without holes always gone down slower !
There was a big difference how they sank down.The board  without holes tumbled 
much more than the Board with the holes (due to the holes,of course)
 Happy New Year again,Herbert,
 German Kr Bilder
Von meinem iPad gesendet

KR> Bellybrake

[Kenneth Wiltrout]

I operate mine manually, I thought I might need to retract it fast in the event 
of a botched landing. I was going to go with a lineal actuator but I assumed I 
could bring it up quicker.


 On Sunday, November 30, 2014 8:35 AM, Kenneth Wiltrout via KRnet  wrote:


 I started with a belly board that had no holes in it and then I made one with 
holes. The brake w/holes works better. I believe that is because with out holes 
the board creates some lift.Kenny N6399U 

? ? On Sunday, November 30, 2014 8:25 AM, Dan Heath via KRnet  wrote:
? 

 It is a mystery.? Mine had no holes and performed very well.? No holes is
easier to implement, so, for me it seemed to be the most logical choice.? I
use an electric servo that I got from Steve Glover.? It has an automatic
stop at both ends of the throw.? I started out with a momentary switch so I
could put it down a little at a time.? However, found that full throw was
always what I needed, so changed it out for simplicity.? Switch down, board
down, switch up, board up.



Manual activation may be better, but it takes up precious room in the
cockpit, so I never considered that option.



See N64KR at?  http://KRBuilder.org - Then click on
the pics 



2105 KR Gathering - McMinnville, OR.? September 3 - 6 -- See U There.



Peoples Choice at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best KR at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Interior at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Paint at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Firwwall Forward at 2013 - KR Gathering in Mt. Vernon, Il - MVN 



Best Interior and Panel at 2008 - KR Gathering in Mt. Vernon, Il - MVN





Daniel R. Heath - Lexington, SC





-Original Message-...Can anyone of the experienced
"bellybrakers"explane ,what kind of bellybrake are the most efficent? brake
is.

.Is it useful to make holes in the brakeshield or not ?

what is the most efficent deploying angle of the board ?

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? 
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KR> Bellybrake

[Kenneth Wiltrout]

I started with a belly board that had no holes in it and then I made one with 
holes. The brake w/holes works better. I believe that is because with out holes 
the board creates some lift.Kenny N6399U 

 On Sunday, November 30, 2014 8:25 AM, Dan Heath via KRnet  wrote:


 It is a mystery.? Mine had no holes and performed very well.? No holes is
easier to implement, so, for me it seemed to be the most logical choice.? I
use an electric servo that I got from Steve Glover.? It has an automatic
stop at both ends of the throw.? I started out with a momentary switch so I
could put it down a little at a time.? However, found that full throw was
always what I needed, so changed it out for simplicity.? Switch down, board
down, switch up, board up.



Manual activation may be better, but it takes up precious room in the
cockpit, so I never considered that option.



See N64KR at?  http://KRBuilder.org - Then click on
the pics 



2105 KR Gathering - McMinnville, OR.? September 3 - 6 -- See U There.



Peoples Choice at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best KR at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Interior at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Paint at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Firwwall Forward at 2013 - KR Gathering in Mt. Vernon, Il - MVN 



Best Interior and Panel at 2008 - KR Gathering in Mt. Vernon, Il - MVN





Daniel R. Heath - Lexington, SC





-Original Message-...Can anyone of the experienced
"bellybrakers"explane ,what kind of bellybrake are the most efficent? brake
is.

.Is it useful to make holes in the brakeshield or not ?

what is the most efficent deploying angle of the board ?

___
Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search.
To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org
please see other KRnet info at http://www.krnet.org/info.html
see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change 
options

KR> Bellybrake

[Herbert Fürle]

...Can anyone of the experienced  "bellybrakers"explane ,what kind of 
bellybrake are the most efficent  brake is.
.Is it useful to make holes in the brakeshield or not ?
what is the most efficent deploying angle of the board ?

My bellyboard is mounted just under the rearspar  and actuated by a 
electro-spindle with two alternately switches to limit the braketravel.
Any helpful discusion is welcome,
Sincerely, Herbert

Von meinem iPad gesendet

KR> Bellybrake

[Dan Heath]

It is a mystery.  Mine had no holes and performed very well.  No holes is
easier to implement, so, for me it seemed to be the most logical choice.  I
use an electric servo that I got from Steve Glover.  It has an automatic
stop at both ends of the throw.  I started out with a momentary switch so I
could put it down a little at a time.  However, found that full throw was
always what I needed, so changed it out for simplicity.  Switch down, board
down, switch up, board up.



Manual activation may be better, but it takes up precious room in the
cockpit, so I never considered that option.



See N64KR at   http://KRBuilder.org - Then click on
the pics 



2105 KR Gathering - McMinnville, OR.  September 3 - 6 -- See U There.



Peoples Choice at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best KR at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Interior at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Paint at 2013 - KR Gathering in Mt. Vernon, Il - MVN 

Best Firwwall Forward at 2013 - KR Gathering in Mt. Vernon, Il - MVN 



Best Interior and Panel at 2008 - KR Gathering in Mt. Vernon, Il - MVN





Daniel R. Heath - Lexington, SC





-Original Message-...Can anyone of the experienced
"bellybrakers"explane ,what kind of bellybrake are the most efficent  brake
is.

.Is it useful to make holes in the brakeshield or not ?

what is the most efficent deploying angle of the board ?