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  #21  
Old 10-26-2018, 08:03 AM
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Quote:
Originally Posted by dwranda View Post
Did you actually trim/sand the front to match the plywood disk before mounting the cowl on the plane?
http://www.vansairforce.com/communit...60&postcount=2

http://www.vansairforce.com/communit...9&postcount=12
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  #22  
Old 10-26-2018, 08:28 AM
dwranda dwranda is offline
 
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This is all fantastic stuff guys!! Thanks for the help. I'm feeling a little more confident now. Keep it coming if anyone has anything else. On another note I think James also sent me the wrong air inlet ring. It seems way too big for that small lower hole. I will be calling them today. Yesterday I was kind of regretting getting this cowl vs the standard one. Hopefully today goes better!!
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  #23  
Old 10-26-2018, 04:40 PM
dwranda dwranda is offline
 
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[IMG][/IMG]

Progress so far copying the Dan H photos. I've got the center circle a perfect 13" but the outer ones are still 1/4" to 3/8" too big. I sanded the top cowl straight across and if I keep sanding to get the outer circles right, the center one will be less than 13. Opinions?
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  #24  
Old 10-26-2018, 04:44 PM
BillL BillL is offline
 
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Quote:
Originally Posted by dwranda View Post
[IMG][/IMG]

Progress so far copying the Dan H photos. I've got the center circle a perfect 13" but the outer ones are still 1/4" to 3/8" too big. I sanded the top cowl straight across and if I keep sanding to get the outer circles right, the center one will be less than 13. Opinions?
Please show or sketch what your reference points are for saying the inlets are off.
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  #25  
Old 10-26-2018, 05:52 PM
dwranda dwranda is offline
 
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Well I went out to take a pic of what I was talking about and decided to sand a little more. I guess I got the outer holes close enough to 5 1/4. It's hard to fully tell when the sides are overlapping and things aren't lined up perfectly though. I think I'm ready to move on to the next step!
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  #26  
Old 11-28-2018, 04:47 PM
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Default Fiberglass

Hey Dave, if you need any advice fiberglassing give me a call. Also, those "spider" marks you mentioned do indeed look like vacuum bag wrinkles and are most likely cosmetic. You can probably just fill with thickened epoxy and smooth.

I'm also planning on a SJ cowl so you better get this figured out! -
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  #27  
Old 11-28-2018, 05:07 PM
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Larry DeCamp Larry DeCamp is offline
 
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Default Define the intake diameter

I just went through this delimma. The intake opening is nebulus with regard to diameter due imperfections in resin/glass. It looks like your “ horizontal centerline” can be moved more toward the outer surface of the cowl . As stated above, the bottom line is a “ fit” to the aluminum ring bearing surface. As Dan says, the rest is just glass and subjective symetry.
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  #28  
Old 11-28-2018, 06:10 PM
dwranda dwranda is offline
 
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Thanks Tom. Finally got the skybolts where they need to be around the firewall. Next is the skybolts on the seam. Hopefully they turn out alright.
As far as the cowl goes I am disappointed in the quality. The halves didn't line up very well together and there was hardly any overlap near the front. I ended up cutting one side too much(my mistake) so now I have to add some back on. This is my first plane but I had one builder tell me these cowls were a work of art. Mine wasn't. The upper cowl maybe but the lower not even close.
I also think they sent me the wrong metal inlet ring for that lower hole so I need to contact them about that.
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  #29  
Old 11-28-2018, 10:03 PM
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N941WR N941WR is offline
 
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Default One other tip

After you fit the cowling together, you will run either a hinge or brackets for quarter turn fasteners up the side but they will not make it all the way up to the round opening.

Fiberglass in a lip on the bottom section, that sticks up and behind the top section, from the end of the hinge or quarter turn fastener supports to the round opening.

This will help prevent air from entering the low pressure side (bottom) of the cowl and when you paint your cowl, it will get painted a well and help hide the black line from the cowl split.
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