VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #331  
Old 01-16-2018, 12:05 PM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,711
Default

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?
__________________
Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD - 50 hours +
65 years running stock DNA
Reply With Quote
  #332  
Old 01-16-2018, 04:14 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 3,529
Default

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.
__________________
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 = 900+ for all

Simplicity is the art in design.
I was born an airplane nut. I have no explanation for it.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Reply With Quote
  #333  
Old 01-16-2018, 06:28 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 3,529
Default

kicking this idea around with Amanda. maybe something like this?

__________________
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 = 900+ for all

Simplicity is the art in design.
I was born an airplane nut. I have no explanation for it.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Reply With Quote
  #334  
Old 01-16-2018, 06:37 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,070
Default

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
Reply With Quote
  #335  
Old 01-16-2018, 07:09 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 3,529
Default

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.
__________________
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 = 900+ for all

Simplicity is the art in design.
I was born an airplane nut. I have no explanation for it.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com

Last edited by Steve Melton : 01-16-2018 at 07:49 PM.
Reply With Quote
  #336  
Old 01-16-2018, 07:17 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 3,529
Default

Quote:
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.
__________________
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 = 900+ for all

Simplicity is the art in design.
I was born an airplane nut. I have no explanation for it.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Reply With Quote
  #337  
Old 01-16-2018, 07:52 PM
Bevan Bevan is offline
 
Join Date: Sep 2007
Location: BC
Posts: 1,718
Default

All this fantastic manufacturing technology is great, but has anyone calculated anticipated drag reduction and therefore increased speed?

Bevan
__________________
RV7A Flying since 2015
O-360-A1F6 (parallel valve) 180HP
Dual P-mags
Precision F.I. with AP purge valve
Vinyl Wrapped Exterior
Grand Rapids EFIS
Located in western Canada
Reply With Quote
  #338  
Old 01-17-2018, 04:53 AM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 3,529
Default

Quote:
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.
__________________
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 = 900+ for all

Simplicity is the art in design.
I was born an airplane nut. I have no explanation for it.
My Artwork is freely given and published and cannot be patented.
www.rvplasticparts.com
Reply With Quote
  #339  
Old 01-17-2018, 06:02 AM
rv8ch's Avatar
rv8ch rv8ch is offline
 
Join Date: Feb 2005
Location: LSGY
Posts: 4,323
Default more

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.
__________________
Mickey Coggins
http://rv8.ch
"Hello, world!"
Reply With Quote
  #340  
Old 01-17-2018, 01:56 PM
sahrens's Avatar
sahrens sahrens is offline
 
Join Date: Jan 2007
Location: Battle Ground
Posts: 534
Default

Quote:
Originally Posted by Steve Melton View Post
kicking this idea around with Amanda. maybe something like this?

Why not attach the cone to an appropriate length hex head screw that threads in from the back side to move the cone into the tie down?

Similar to the fuel drain fairing attachment but with the screw end attached to the cone.
__________________
Scott
RV-7 N818BG (flying)
Bearhawk Patrol (building)
RV-7 (resurrecting)
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:06 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.