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.

  #441  
Old 05-12-2016, 12:40 AM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,309
Default

Version 1 of the reinforcement ring seemed strong enough yet too big, not enough room for rubber in the next mold. I made another ring 1/4 inch wide X 10/32 thick, I also drilled 3 holes in the mold to act as feet to hold the ring up into the second mold.





The new ring is definitely more flexible, though once covered with rubber I think it will be a good compromise. In the next mold it has just over 1/8 inch on either side for rubber.

__________________
RV 7 500 hours and counting
20 donation done
Reply With Quote
  #442  
Old 05-17-2016, 06:11 AM
bret's Avatar
bret bret is offline
 
Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
Default

Quote:
Originally Posted by crabandy View Post
Thanks Brett!

The plenum turned out pretty good for an amateur!

Dang look at that! Awesome! I found that in my final paint prep for tinny missed pin holes, Bondo worked great, Just got to get it in there fast while it is wet and goopy, wet X pattern 360 and glossy black paint did not show anything. Bondo on an aircraft? are you Crazy? Yip!
__________________
7A Slider, EFII Angle 360, CS, SJ.
Reply With Quote
  #443  
Old 05-17-2016, 11:18 AM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,309
Default

I precut the straight weave 9.66 oz (7500 from spruce), I was only able to line up the fabric perpendicular as recommended earlier on the outside surface and keep the fabric 1 piece.



I used 3 coats of wax followed by 3 coats of PVA on the plugs. I did bake my cabosil to remove any moisture as smooth on recommends doing for their ure-fil 9 silica based thickening agent. I used 2 tablespoons of cabosil per 25 grams of PMC-780 part B to thicken it slightly. I did 3 coats of rubber with a brush alternating right side up and upside down while the rubber dried to the tacky state, gravity did slide the rubber as it dried. I used unthickened rubber for the glass layer, then one more layer of rubber over the glass applied with a foam roller.





I used water poured in from the backside to slide to boots off the plugs, I'm pretty happy with how these turned out. Now to trim/fit and mold the inlet lip!



__________________
RV 7 500 hours and counting
20 donation done
Reply With Quote
  #444  
Old 05-17-2016, 08:34 PM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,309
Default

The untrimmed boots fit pretty dang well, I got a little aggressive sanding the corners of my plug and will have to glob some silicone in the corners. I need a couple days off work and I could be flying again!

__________________
RV 7 500 hours and counting
20 donation done
Reply With Quote
  #445  
Old 05-18-2016, 07:12 AM
rivetdriver rivetdriver is offline
 
Join Date: May 2012
Location: TX
Posts: 84
Default

nicely done.
What kind of rubber did you use on this?
__________________
Many F1 Rockets and EVO`s
5 RV7A`s
2 RV8`s
award winning F4 Raider fuselage
MG-1
dues paid
Reply With Quote
  #446  
Old 05-18-2016, 07:27 AM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,309
Default

I used the urethane rubber PMC780 from smooth on:

https://www.smooth-on.com/products/pmc-780-dry/
__________________
RV 7 500 hours and counting
20 donation done

Last edited by crabandy : 05-18-2016 at 10:11 PM.
Reply With Quote
  #447  
Old 05-18-2016, 05:16 PM
bret's Avatar
bret bret is offline
 
Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
Default

That looks real good!
__________________
7A Slider, EFII Angle 360, CS, SJ.
Reply With Quote
  #448  
Old 05-18-2016, 05:50 PM
Chkaharyer99 Chkaharyer99 is offline
 
Join Date: Oct 2011
Location: Pilot Hill, CA
Posts: 868
Default

Great write up.
__________________
Charlie
RV-8
Reply With Quote
  #449  
Old 05-18-2016, 08:53 PM
BillL BillL is offline
 
Join Date: Sep 2007
Location: Central IL
Posts: 6,313
Default

Quote:
Originally Posted by crabandy View Post
I used the urethane rubber PMC870 from smooth on:

https://www.smooth-on.com/products/pmc-780-dry/
So 870 or 780? I will order one or the other tomorrow.
__________________
Bill

RV-7
Reply With Quote
  #450  
Old 05-18-2016, 10:07 PM
rightrudder rightrudder is offline
 
Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,853
Default

Coming along nicely. I think you've got more hours in the cowling/plenum than some do in their entire planes!
__________________
Doug
RV-9A "slider"--sold in July 2021
Flew to Osh in 2017, 2018 & 2019!
Donation made for 2021
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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 05:57 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.