Cascade Ultralights Kasperwing

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Highflight

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Henryk,

The shadows are of the pilot, engine and frame parts. Scott was in a near knife edge banking turn to get the sun on the underside of the wing.
YES! Good to see Don make a successful flight in his Kasperwing. We expect a record number of Kasperwings at next year's event, there should be one from Canada attending. Several more Kasperwings are awaiting restoration locally including the 3-axis model.

Photo is of a Mitchel Wing with Kasper wingtip controls built by Butch Walters in the mid 1980s, he modified two Mitchel Wings with the Kasper wingtips, one was for a paraplegic pilot . Butch said that the KW tips improved control and overall performance.

Butch Mitchell 1.jpg Butch Mitchell.jpg
 

henryk

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Henryk,

The shadows are of the pilot, engine and frame parts. Scott was in a near knife edge banking turn to get the sun on the underside of the wing.
YES! Good to see Don make a successful flight in his Kasperwing. We expect a record number of Kasperwings at next year's event, there should be one from Canada attending. Several more Kasperwings are awaiting restoration locally including the 3-axis model.

Photo is of a Mitchel Wing with Kasper wingtip controls built by Butch Walters in the mid 1980s, he modified two Mitchel Wings with the Kasper wingtips, one was for a paraplegic pilot . Butch said that the KW tips improved control and overall performance.

View attachment 74031 View attachment 74032
-greate thanks for info!

BTW=do You know efficiancy gaining thanks "Gurney" flaps=

^23F0A3406FBFD53319250A19E78BD2C14933F0074544258410^pimgpsh_fullsize_distr.jpg =auer attempt=low effect...

^C5021599A3F44AFBCF25718ECF2783DAAC6EB66D75385AE4F9^pimgpsh_fullsize_distr.jpg

^CDF7261242F6153FAFE4E9463BCFDD44A4D4C97136390A0816^pimgpsh_fullsize_distr.jpg =better...?
 

Highflight

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KW owner Scott says that the anti-servo tabs "are like power steering", he wants to make his other two KWs the same as the one with the yellow wingtips. I don't know the "percentage" of improvement but they are a noticeable improvement in effectiveness over just the trimmed down rudders. I frequently use both the rudders for glide slope control, trimmed rudders are less effective than the original factory rudders. The anti-servo tabs restore most of the effectiveness without the control pressure of the factory original rudders.
 

henryk

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KW owner Scott says that the anti-servo tabs "are like power steering", he wants to make his other two KWs the same as the one with the yellow wingtips. I don't know the "percentage" of improvement but they are a noticeable improvement in effectiveness over just the trimmed down rudders. I frequently use both the rudders for glide slope control, trimmed rudders are less effective than the original factory rudders. The anti-servo tabs restore most of the effectiveness without the control pressure of the factory original rudders.
"The anti-servo tabs restore most of the effectiveness without the control pressure of the factory original rudders. ""

-not clear to me...?
 

Doggzilla

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"The anti-servo tabs restore most of the effectiveness without the control pressure of the factory original rudders. ""

-not clear to me...?
I think he's confusing servo tabs with anti-servo tabs.

Servo tabs decrease control forces by acting like a hydraulic boost. Anti-servo tabs work opposite of servo tabs, they increase control pressure to make it more difficult to overstresss the airframe.

Many American aircraft have anti-servo tabs that make control more difficult as the controls are pulled harder.
 

Highflight

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In the Kasperwing installation I believe the tabs in question are anti-servos. Steve Grossruck shortened the chord of a KW rudders to reduce control pressure experienced by the pilot. He then fabricated the rudder anti-servo tabs to deploy in the same direction as the rudder thus increasing the rudder's effectiveness without significantly increasing pilot control pressure. I have replaced the test string actuator with convention control rods, something Steve had planned to do but was too ill to continue work on the anti-servo tabs. The plan is to retrofit our fleet of KWs with the "bobbed" rudders and tabs as time allows, it is a lot of work to restore and maintain a hanger full of 1980's vintage ultralights.

anti-servo tab 2.jpg
 

Highflight

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The Kasperwing in the photos you posted is owned by Scott Price, the rudders were modified by Steve Grossruck. I removed the string Steve had originally installed and replaced it with the aluminum control rod in the photos. The string did not prevent the tabs from floating, the control rod prevents this condition. We plan on fabricating new anti-servo tabs, the set that Steve fabricated were quickly built prototypes to test the anti-servo concept on the KW rudders. The blue tape is a test gap seal at the hinge line, I plan on using a continuous "piano" hinge on the new tabs.
Scott prefers the anti-servo tab rudders to any other configuration he has flown, he says it is like "power steering". The anti-servo tabs performs like span wise flow fence, increasing the rudders effectiveness, Note that the trailing edge of the shortened rudders are approximately parallel to the rudder hinge line, the factory rudders trailing edge is vertical.
 
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