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Old 09-07-2017, 09:30 PM   #501
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would require surgery to cut into the wing for it to clear........


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Old 09-07-2017, 09:50 PM   #502
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How did you attach the spade bracket to the lower aileron? (Imagine if I show up in the Range Duster at a contest. And it had spades. I'd win simply from everyone being confused? &#128513


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Old 09-07-2017, 09:52 PM   #503
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Same as pitts/eagle. Bolted to aileron arm. Picks up pushrod bolt, and add another above it....I'll get pics.
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Old 09-07-2017, 10:05 PM   #504
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1 - A flat aluminum plate will flex. That is why the Pitts spades are bent on the edges. Flexing will result in fatigue cracks at the screw holes. And it can cause transient changes in the control feel as the aerodynamics change. Probably won't notice that. Extra spades have core with fiberglass or carbon faces and so are much stiffer.

2 - Spades are powerful enough on the bottom ailerons and they are connected directly to the control system. This means less slop, vibration, and flutter potential. Fewer parts is good. And folks with poorly tuned spades on the lower ailerons already complain loudly about their sloppy control feel. Trying to tune 4 spades makes finding the sweet spot even harder. And its already voodoo to most guys.

Best of luck,

Wes

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Old 09-07-2017, 10:14 PM   #505
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yea, I made these flat out of .090 2024 T3. I believe the pitts ones are .050 or .063 and bent. as someone noted previously these will not be aluminum forever, these are test pieces till I get the shape I want......... good info wes and thanks for the drawings. the arms fit perfectly and the dimensions were spot on.
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Old 09-07-2017, 10:18 PM   #506
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Good on ya for being the coolest uncle in the neighbourhood!
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Old 09-07-2017, 10:59 PM   #507
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There are two schools of thought out there on spade shapes. Steve Grohsmeyer was experimenting with increasing the aspect ratio to get greater efficiency on his Eigenhawk. Rob Holland got together with a west coast aerodynamicist who also flys competition and after some calculation they put oval shaped, low aspect ratio spades on his ship. Rob really likes how they feel.

And if you want a little yaw-roll coupling on your ship to make flying cross-country a little easier, cant the spades a little inboard tip down.

Its voodoo.

Wes
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Old 09-07-2017, 11:03 PM   #508
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Did I hear someone say carbon fiber spades? Smizo? You gonna let that one go?
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Old 09-08-2017, 06:54 PM   #509
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Hey Dan, yep that's the plan soon as I get the ones that work best.......

this mysterious oval shape wes speaks of....... is there photos?
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Old 09-08-2017, 06:57 PM   #510
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I'm kind of curious too. I practice with Steve every now and then. I'll try to remember to ask him about them.


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