VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-10
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 11-15-2018, 02:39 PM
lr172 lr172 is online now
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,338
Default

Quote:
Originally Posted by az_gila View Post
Yes, but surely this will seal...

I would expect so. However, the manufacturer recommends a minimum or optimum amount of compression for a reason (can't recall the exact percentage), so I wouldn't simply trust the fact that it "looks like it will seal."

Larry
__________________
N64LR
RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress
Reply With Quote
  #12  
Old 11-15-2018, 03:18 PM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,743
Smile

Quote:
Originally Posted by lr172 View Post
I would expect so. However, the manufacturer recommends a minimum or optimum amount of compression for a reason (can't recall the exact percentage), so I wouldn't simply trust the fact that it "looks like it will seal."

Larry
Good point on data....

First one I found was a Grainger identical part -

Although many mistakenly believe that a higher compression rate results in a stronger hold, our bulbs are designed and engineered to work best at 25-40% compression of its original height, with 25% being optimum. If you compress it more than that, its life and serviceability will be limited. When building your part, be sure to choose the bulb size that correlates to a 25% compression rate for your application.

https://vimeo.com/28068686

https://www.trimlok.com/rubber-extru...rim-seal/hatch

I can't seem to find a manufacture's detailed data sheet for the actual McMaster product.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Reply With Quote
  #13  
Old 11-15-2018, 03:23 PM
lr172 lr172 is online now
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,338
Default

Quote:
Originally Posted by az_gila View Post
Good point on data....

First one I found was a Grainger identical part -

Although many mistakenly believe that a higher compression rate results in a stronger hold, our bulbs are designed and engineered to work best at 25-40% compression of its original height, with 25% being optimum. If you compress it more than that, its life and serviceability will be limited. When building your part, be sure to choose the bulb size that correlates to a 25% compression rate for your application.

https://vimeo.com/28068686

https://www.trimlok.com/rubber-extru...rim-seal/hatch

I can't seem to find a manufacture's detailed data sheet for the actual McMaster product.
Well I am unhappily a part of the "Mistakenly believe" crowd. I would guess our seals are pretty similar if using the same type if foam EPDM. However, the Grainger seals look more oval than round, which may impact the desired compression level, as the round seals need more compression to become oval.

Larry
__________________
N64LR
RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress

Last edited by lr172 : 11-15-2018 at 03:27 PM.
Reply With Quote
  #14  
Old 11-15-2018, 03:46 PM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,743
Smile

Quote:
Originally Posted by lr172 View Post
Well I am unhappily a part of the "Mistakenly believe" crowd. I would guess our seals are pretty similar if using the same type if foam EPDM. However, the Grainger seals look more oval than round, which may impact the desired compression level, as the round seals need more compression to become oval.

Larry
The catalog pics show the bulb as being quite round, but I would like to see an actual spec. sheet or application note for the McMaster product.

https://www.trimlok.com/secure/conte...i+10132016.pdf
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Reply With Quote
  #15  
Old 11-15-2018, 05:42 PM
Bill Boyd's Avatar
Bill Boyd Bill Boyd is offline
 
Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,183
Default

FWIW, Gil, and as detailed in another thread, I was shocked to find the 1/4" gap I had created was not enough to allow the door to close with the 3/8" bulb seal. Pin engagement was not happening no matter how I pushed. I took the gap wider, to .30" and still was not able to close the door.

Rather than grind further, which no doubt would have eventually allowed the door to close, I replaced the 3/8" bulb seal with a 9/32" bulb - 3/16" channel width seal. Perfect. I only have to add thickness to the door edges in a few spots because the narrower channel grips well to the thinner doorway edges that are left after all that grinding I did.

I don't know yet how well it will seal at the compression that's occurring, but I guess if I hear wind noise I can go back to the 3/8" seal or, perhaps more easily, add thickness to the door inner surface to increase the bulb compression of the smaller seal I went with. At this point I'm just delighted my doors finally close with a seal in place - and that without undue torque on the handle.
__________________
Bill Boyd

Hop-Along Aerodrome (12VA)
RV-6A - N30YD - flying since '98
RV-10 - N130YD reserved - under construction

donating monthly to the VAF - thanks, Doug
Reply With Quote
  #16  
Old 11-15-2018, 07:29 PM
Drippy Drippy is offline
 
Join Date: Nov 2015
Location: Vermont
Posts: 106
Default rear hinge gap

I don't know about the rest of you but living here in VT cabin heat can be an issue during winter. So I have spend at little bit of time looking for leaks. The biggest flow outflow of air for me is around the door seal near the rear door hinge. Because of the cut out required due to the hydraulic piston and hinge I am not getting a good seal with my Mcmastercard seal. I tried putting a piece of fiberglass across this area but interference with the piston resulted in me grinding/sanding a way a path for the piston and the recent cold spell has demonstrated yes I am still getting pretty good flow.

But I like the idea of putting the gasket on the door in that area. I am going to give it a try.

Thanks for the idea.
__________________
Mike
N95VT
RV10
~150hrs flying
Reply With Quote
  #17  
Old 11-15-2018, 08:41 PM
Bill.Peyton's Avatar
Bill.Peyton Bill.Peyton is offline
 
Join Date: Sep 2009
Location: St. Louis, MO
Posts: 1,652
Default

I ended up with around a 25% compression. The seal works fine with only that amount. I have been flying for 6 years and 900 hours and the seals still look new. You will never get the doors to close if you try to over compress the seal, I tried.....

[IMG][url=https://flic.kr/p/24S2E8J]

[IMG][url=https://flic.kr/p/24S2DWS]
__________________
Bill Peyton
RV-10 - 875 Hrs
First Flight Oct 2012
WA0SYV
Aviation Partners, LLC

Last edited by Bill.Peyton : 11-15-2018 at 08:45 PM.
Reply With Quote
  #18  
Old 11-15-2018, 10:01 PM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,743
Question

Quote:
Originally Posted by Bill.Peyton View Post
I ended up with around a 25% compression. The seal works fine with only that amount. I have been flying for 6 years and 900 hours and the seals still look new. You will never get the doors to close if you try to over compress the seal, I tried.....
....
Bill, did that work out to about a 5/16 inch gap?
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Reply With Quote
  #19  
Old 11-15-2018, 11:39 PM
lr172 lr172 is online now
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,338
Default

Quote:
Originally Posted by az_gila View Post
Bill, did that work out to about a 5/16 inch gap?
The base below the bulb is about .075", so 25% compression of the 3/8 bulb should net a .360" gap.

The 9/32" bulb would net about .280." Given that I followed other advise and set my gap at 1/4" maybe I will swap the 3/8 bulb for the 9/32 variety.

I am a bit concerned that my bulb came out of the package compressed a bit from round. if that is the norm, then we need a bit more compression to account for that.

Larry
__________________
N64LR
RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress
Reply With Quote
  #20  
Old 11-16-2018, 12:07 AM
az_gila's Avatar
az_gila az_gila is offline
 
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,743
Smile

Quote:
Originally Posted by lr172 View Post
The base below the bulb is about .075", so 25% compression of the 3/8 bulb should net a .360" gap.

The 9/32" bulb would net about .280." Given that I followed other advise and set my gap at 1/4" maybe I will swap the 3/8 bulb for the 9/32 variety.

I am a bit concerned that my bulb came out of the package compressed a bit from round. if that is the norm, then we need a bit more compression to account for that.

Larry
Since I'm still sanding and making dust so I can use the just under 5/16 dimension. I have the very lumpy green cabin cover so keeping the 1/4 edge thickness is going to take quite a bit of work anyway.

With your numbers, a 40% compression of the 3/8 bulb gives a 0.300 gap, just under the 0.3125 (aka 5/16) guess I made.

I think I'll simply aim for a 0.300 gap with my existing seal.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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 11:46 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.