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  #341  
Old 01-16-2018, 12:05 PM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
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Quote:
Originally Posted by Steve Melton View Post
yep, it needs a spring loaded plunger. difficult to fit. I think I'll take the easy way out and give it to Amanda to solve. it will be interesting to see what a 15 yr old can come up with.
Roll pin, like the one that holds your back-riveting set together?
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  #342  
Old 01-16-2018, 04:14 PM
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Quote:
Originally Posted by Bill Boyd View Post
Roll pin, like the one that holds your back-riveting set together?
yeah, maybe something like that. thx for the tip.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.
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  #343  
Old 01-16-2018, 06:28 PM
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kicking this idea around with Amanda. maybe something like this?

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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.
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  #344  
Old 01-16-2018, 06:37 PM
David Paule David Paule is offline
 
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How about three rounded bumps inside the cylindrical bore: one on each sides and one in front of the cylindrical bore?

The front one would simply be a locator to keep the fairing from going too far aft accidentally, while the two side ones would tend to snap in place. The skin would provide support in pitch and roll, while the bumps themselves would give support in yaw.

To remove it, pull forward to unsnap it, and then down. You'd have to have enough clearance at the aft side of the bore to permit that motion.

This will only work if the Cleaveland fitting always screws in to the same position, but then any method that relies on locating the fitting's holes has that issue.

Dave
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  #345  
Old 01-16-2018, 07:09 PM
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I think I understand your thoughts. I do like the idea of the bumps on the fwd side but want to be sure the fairing is pushed upwards towards the skin, hence the cone shape. this design doesn't have yaw constraint. it will probably be able to wiggle in yaw slightly by hand, but not much as the cones will contact the edges. it will have roll and pitch constraint to the wing skin. thanks for the input, noted and sketched.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.

Last edited by Steve Melton : 01-16-2018 at 07:49 PM.
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  #346  
Old 01-16-2018, 07:17 PM
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Steve Melton Steve Melton is offline
 
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Originally Posted by aparchment View Post
LOL! Great idea Steve. Give her a leg up on devising practical solutions.

Thanks to you and Amanda for the printed fuel drain fairings. They fit like a glove.
Amanda says thanks. And I'll tell you that she took the money and bought another fish for her tank. It's all about plastic and fish around here.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.
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  #347  
Old 01-16-2018, 07:52 PM
Bevan Bevan is offline
 
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All this fantastic manufacturing technology is great, but has anyone calculated anticipated drag reduction and therefore increased speed?

Bevan
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  #348  
Old 01-17-2018, 04:53 AM
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Steve Melton Steve Melton is offline
 
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Originally Posted by Bevan View Post
All this fantastic manufacturing technology is great, but has anyone calculated anticipated drag reduction and therefore increased speed?

Bevan
I have not, but I am working to get CFD up and running to make an assessment.
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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 600+ for all

Simplicity is the art in design.
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  #349  
Old 01-17-2018, 05:06 AM
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As it it less than 20$ in plastic and other parts if you already have a 3D-printer, I am fine with skipping the calcs and settle for testing... anything above 3 knots for the drain and flap attachment fairing would make me think it is worth it
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  #350  
Old 01-17-2018, 06:02 AM
rv8ch rv8ch is offline
 
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Quote:
Originally Posted by control View Post
As it it less than 20$ in plastic and other parts if you already have a 3D-printer, I am fine with skipping the calcs and settle for testing... anything above 3 knots for the drain and flap attachment fairing would make me think it is worth it
My highly calibrated eyeball estimates that this will give you up to 4.159265359 knots.
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