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  #701  
Old 04-02-2021, 04:16 PM
jcarne's Avatar
jcarne jcarne is offline
 
Join Date: Jul 2016
Location: Worland, Wyoming
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Before commencing on the wheel pants (which will probably be a few months from now) I wanted to get to know the aircraft better before completing them. In the video below you can see as I slow down on the roll out the main gear shimmies a bit. (the rest of the video is just me taxiing) Not my best landing but hey, there was a descent cross wind. This happens at about 30 knots and quick goes away at about 27 ish knots.

I'm in the process of changing up some tire pressures to see if it does anything but it looks like I am going to have to add stiffeners per the plans to get rid of this shimmy. It's really not bad but I'd rather get rid of if; if anything to protect the wheel pants in the future.

https://youtu.be/5CGRSIN7gYQ

Stay tuned for the resolution on this.

Of course I will also give you all some build motivation as well!

Bonus points if anyone knows what is off my right wingtip in the first pic.

IMG_0600 by Jereme Carne, on Flickr

IMG_0601 by Jereme Carne, on Flickr
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  #702  
Old 04-02-2021, 07:57 PM
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Vlad Vlad is offline
 
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Nice picture of old Thermopolis
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  #703  
Old 04-02-2021, 10:58 PM
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jcarne jcarne is offline
 
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Quote:
Originally Posted by Vlad View Post
Nice picture of old Thermopolis
Leave it to Vlad to get it! haha nice one
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  #704  
Old 10-10-2021, 04:26 PM
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jcarne jcarne is offline
 
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Well hot diggity dog I forgot I never posted anything about wheel pants on here. I didn't take very many pics as I was in mega work mode; once the plane is flying taking it down for maintenance is brutal! The wheel pants are an absolutely insane amount of work and the ole gal was down for about 1.5 weeks while I worked 8 hours a day installing them.

First, when it comes to the wheelpants I have been asked by other builders "should I wait to install them until after flying?" to which my answer has changed over time. I flew without them for the first 80ish hours (if memory serves) and the advantages are:
1. easy inspection of the brakes/wheels
2. easy to air tires
3. you know if you have any built in trim issues


I also hear others say the perceived advantage of having more drag for break-in. I have heard countless people say this. After having flown with and without the pants installed I can confirm that this is one of the stupidest reasons that ever did cross my ears.

After having flown awhile I wish I would have just installed them during the build and flown with them from the start. It would have saved me downtime from flying and to be honest the increased airspeed would have been nice on those hotter days during climb. In fact, flying without them on a hot day while breaking in an engine would definitely put the CHTs above where I would personally want them while climbing. I wasn't worried about it as I was doing my break-in with 30-40 degree OATs.

So, long story short, on my next build (-10) I will be installing them before flight and I will just deal with removing screws to inspect the brakes and tires. Virtually everything else favors having them on for flight.

Anyways, back to installation. First I made up some wing jacks that closely match what other builders have done. Only cost in making these was the two bottle jacks as everything else was scrap I had. For the jack points I welded on a bolt onto the top of a gas line cap, this worked beautifully.

IMG_1238 by Jereme Carne, on Flickr

I also spent many a time making sure the plane was level in both directions. This is important for alignment. I also didn't have the balls to leave the plane on the jacks overnight (even though no one else is in my hangar) so I had to do this process every morning.

IMG_1240 by Jereme Carne, on Flickr

First up was the brackets and gear leg fairings. These are where most of the speed gains come from (more on that later).

IMG_1241 by Jereme Carne, on Flickr

For the next part you will need to get yourself sufficiently covered in fiberglass dust from mass quantities of tiny trimming amounts. Shortly after you will need to get yourself tangled in a mess of string to make sure things are aligned properly. Seriously, these steps are massively time consuming.

IMG_1242 by Jereme Carne, on Flickr

Just when you think you are done go ahead and slap yourself in the face and say "not even freakin close" there is still finishing to do. Time to go back to the glory days, grab your most hated metal can and glass jars and apply some micro, sand sand sand, and well, you know the rest.

IMG_1245 by Jereme Carne, on Flickr

After completely finishing and priming all of the nose gear parts it is time to say "good nuff" and go do some flying.

IMG_1251 by Jereme Carne, on Flickr

I was very pleased when I saw my ball still centered and even more pleased after seeing the speed increase. Those people that say you will pick up around 15 kts of airspeed were not lying. Those numbers are pretty much spot on what I found as well. The plane climbs better/faster and certainly gets you from A to B quicker. The engine stays noticeably cooler in climbs and the plane also looks like an RV, amazing how much the look changes.

Now that you think you are done with wheel pants slap yourself in the face one more time and get to gettin on the intersection fairings. If you want to be like me go out, buy 30 bucks worth of modeling clay, slap it in there and then after 30 minutes of working it around say "F this" and go bust out the credit card. I elected to purchase some fairing from RVbits.com and boy oh boy them bad boys are worth the money! Very nice quality and they fit pretty dang well. It still takes a considerable amount of time to install them though. They won't be a perfection fit but they are pretty dang good. Not to mention when someone at Oshkosh is looking down at your wheel pants to find tiny gaps just remind them "my eyes are up here".
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Last edited by jcarne : 10-10-2021 at 04:32 PM.
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  #705  
Old 10-10-2021, 04:41 PM
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wirejock wirejock is offline
 
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Location: Estes Park, CO
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Default Finishing

Beautiful work Jereme. I'm glad I bought the RV Bits fairings now.
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Donated 12/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (3,000+ hours)
Empennage, wings, fuse, finishing kit done. Working FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #706  
Old 10-10-2021, 09:40 PM
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jcarne jcarne is offline
 
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Thanks Larry! You will really like those fairings.

Once the plane is flying that doesn't mean the building/tweaking stops. Some cables need tidied up. Adhesive backed Velcro sure is some awesome stuff!

IMG_1259 by Jereme Carne, on Flickr

The inlet air deflectors needed trimmed as well. The CHTs on the front two cylinders were a little higher than the back two. After much research many a guys fixed this by removing some of these air dams.

Slip a piece of metal between the dam and the cylinder and mark a cut line. The metal piece will bend forward just enough to debur it as well.

IMG_1263 by Jereme Carne, on Flickr

This is where the right side ended up.

IMG_1264 by Jereme Carne, on Flickr

The left side needed a bit more trimming. Cylinder #2 is still my hottest but not by very much. Honestly if I was building again I would completely leave this air dam off and add material if needed. Sounds like many many others have completely removed this side.

IMG_1265 by Jereme Carne, on Flickr

Now get out there and go fly! Oh... I should probably do something to that dash so I don't have to keep those gloves up there. Next time!

IMG_1884 by Jereme Carne, on Flickr
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  #707  
Old 10-15-2021, 04:49 PM
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cgeyman cgeyman is offline
 
Join Date: Apr 2017
Location: Missoula MT
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Default Nice build

Very pretty plane. Thanks for the wheel pants tips.👍
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  #708  
Old 10-18-2021, 11:26 AM
ryankhallcpa@yahoo.com ryankhallcpa@yahoo.com is offline
 
Join Date: Jan 2018
Location: Taylor, AZ
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Yeah, you have a beautiful plane and I really appreciate the updates from you Jereme! Your picture log is my first go-to when I ask myself "how the h*** do I do that?", which is often. I've been doing that for a little over 4 years now.

But...I'm seeing light down there at the end of this tunnel now...so yep getting to be very exciting!

Ryan
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  #709  
Old 11-21-2021, 11:49 AM
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Draker Draker is offline
 
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Quote:
Originally Posted by jcarne View Post
I safety wired the prop and managed to slip and really butchered up my hand. Hartzell actually doesn't require you to safety wire it and they recommend at least 0.032 if you do. I went with 0.041 just to avoid a potential argument with the DAR. Although he seems like a really reasonable guy so far when I have had questions.

Is that just heat shrink or something else around the safety wire, and is the purpose to protect the prop hub from scratches?
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  #710  
Old 11-21-2021, 03:02 PM
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jcarne jcarne is offline
 
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Location: Worland, Wyoming
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Quote:
Originally Posted by Draker View Post
Is that just heat shrink or something else around the safety wire, and is the purpose to protect the prop hub from scratches?
Yes sir, just to protect the hub. It is vacuum line I bought at Ace Hardware. I think I found it in the automotive section.
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