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  #1  
Old 06-18-2010, 09:32 PM
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Space Cadet Space Cadet is offline
 
Join Date: Mar 2007
Location: Denver, CO
Posts: 211
Default Propeller back plate simulator?

I'd like to fit up my cowl but don't have the prop or spinner assembly yet. I've read on other models there's instructions to simulate the backplate mounting, but anyone done it for the -10? Or did I read I could just buy the backplate or borrow a simulator somewhere? I'm tired and too frustrated to go searching right now

Thanks,
Dwight
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  #2  
Old 06-20-2010, 02:45 AM
HelioJoe HelioJoe is offline
 
Join Date: Feb 2008
Location: New Smyrna Beach, Florida
Posts: 243
Default Simulation

Dwight......I've done it twice and works fine. Finishing up an RV-10 right now and still don't have a prop.
Install the flywheel/ring gear. Cut 4 pieces of PVC pipe exactly 2 1/4". Square the ends. Four bolts will go through these. Borrow a spinner back plate or make something similar, aluminum or even wood. Order of assembly is forward to aft. Plate, 2 1/4" spacer, flywheel. Your cowling will fit between plate and flywheel. By the way...that spacing will fit both the Hartzell and the MT.

Wish I knew how to post photos, that set up is mounted on the engine right now. Dave Maib's RV-10 is in a hangar across from me. I'll ask him on Monday if he knows how.

Best Regards.....Joe.

Last edited by HelioJoe : 06-20-2010 at 02:47 AM.
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  #3  
Old 06-20-2010, 01:21 PM
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Space Cadet Space Cadet is offline
 
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Location: Denver, CO
Posts: 211
Default Got it, thanks!

Joe, thanks! Was just about to post that all I needed was the spacer dimension. I think that's the same dimension on the smaller RVs too. I'll take a picture if you figure out how to do it, just to be sure, but think I've got it. You can send via PM if you prefer.

Just for kicks- the backplate diameter's roughly 13" for standard cowls and spinners, right?

Dwight
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Last edited by Space Cadet : 06-20-2010 at 01:25 PM.
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  #4  
Old 06-21-2010, 08:56 AM
azcloudflyer azcloudflyer is offline
 
Join Date: Feb 2008
Location: Apache Junction, Az
Posts: 53
Default

I measured 13.125" for the diameter and my spacers were 1.570". The dimensions in the Van's bulletin for the spinner simulator are not correct for the RV-10.

Dimensions and pictures are about half way down the page here:

http://www.azcloudflyer.com/finish22.html
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  #5  
Old 06-21-2010, 09:37 AM
johnfurey johnfurey is offline
 
Join Date: May 2005
Posts: 228
Default Backing Plate Fixture

I have a GREAT fixture that I stole from a friend. It uses an old prop hub and simulates the spinner in outside dimentions and 1/4" spacing to cowl. You can change spacers if you want a different gap. The beauty is that you have no prop blades in your road and you drill through the fixture into cowl to lock the top and bottom cowls in place and nothing ever moves as you work on final fit. Take the top off and keep bottom in place or visa versa. If I knew how to post a picture I would or if someone tells me where to send it I will forward the pictures to post.
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  #6  
Old 06-21-2010, 09:58 AM
rv9aviator rv9aviator is offline
 
Join Date: Jan 2005
Location: Arkansas
Posts: 1,504
Default

PM sent:

Send them to me and I'll post them for you.
Here are John's pictures.
[IMG][/IMG]


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RV-9A N9JW 90919 SoldArkansas
http://www.jimsairplanes.com
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Last edited by rv9aviator : 06-21-2010 at 01:39 PM.
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  #7  
Old 06-22-2010, 12:26 PM
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Space Cadet Space Cadet is offline
 
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Location: Denver, CO
Posts: 211
Default Spacer sizing

Thanks for the pics John, that is a good idea.

I guess to be safe I should use the larger of the two spacer sizes listed, then I can trim up to final if needed later.

Thanks to all,
Dwight
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  #8  
Old 07-19-2010, 09:20 PM
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Space Cadet Space Cadet is offline
 
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Location: Denver, CO
Posts: 211
Default Follow-up Question

Okay guys (and gals), I have the spacers and back-plate simulator, with the cowl ready to go, but I don't see how to center/align the top cowl properly with this setup. The over-sized holes in the simulator allow too much movement in height and side-to-side when being mounted, no? And that small movement in front means bigger movement of the trim line at the back of the cowl on the sides, where it shows most.

I could make the back-plate simulator round and look like the real back plate (mine is square at the moment), but I'm concerned it doesn't sit well centered with the crank/prop line still. Do I make a template to fit over the prop extension/crank behind the simulator to match up to the front of the cowl?

Or am I just over-thinking this?

Dwight
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  #9  
Old 07-20-2010, 06:21 AM
rv9aviator rv9aviator is offline
 
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Location: Arkansas
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Default

I had the same concerns so I made a plug to fit the crank and spinner and used the tube spacers. It wasn't a big deal for me as I own a machine shop but I would try to borrow a prop adaptor from someone if possible instead of messing around with spacers and stuff. After I made all the spacers and center plug I found out a friend had a prop adaptor to loan me.
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  #10  
Old 07-21-2010, 04:45 PM
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Ivan Kristensen Ivan Kristensen is offline
 
Join Date: Mar 2008
Location: Guelph Ontario
Posts: 196
Default Prop hub and cowl installation

Here is a link to my photo album http://ivankristensen.phanfare.com/2...D=69090517with pictures and description of my cowl installation.

Ivan K.
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SN # 40838 (C-GMDV)
First flight June 28, 2010. Now 1095 hours of flight time.
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2018 VAF dues paid.

Link to my build site:
https://ivankristensen.smugmug.com/B...ENTAL-aircraft
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