Project: JAveryPanther   -  
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Builder Name:Justin Avery   -  
Project:   Sport Performance - Panther   -   VIEW REPORTS
Start/Last Date:Jan 14, 2024 - No Finish Date
 
Friendly URL: https://eaabuilderslog.org?s=JAveryPanther

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Mar 17, 2024     Left Elevator & Trim Tab       Category: Empennage
The left elevator is constructed nearly identically to the right elevator, except that the left elevator also contains the trim tab.

Because the trim tab is essentially a hinged surface within the elevator, I need to trim (no pun intended) the middle and inner ribs to allow for this movement in addition to installing the trim spar and reinforcing the trailing edge of the elevator. Currently, I have temporarily installed the ribs and hinge and drilled to initial #40. I still need to trim the ribs to account for the trim hinge and elevator rear spar, along with detaching the trim tab from the elevator and building it up according to plans.


 
Mar 04, 2024     Right Elevator       Category: Empennage
The right elevator is the first component suggested by the plans to build due to its relatively simple construction. Even so, the ribs aren't match drilled from the factory which results in the the builder needing to carefully align the ribs inside the elevator skin to ensure that edge distance tolerances aren't exceeded when drilling/riveting. The initial assembly requires match drilling the various parts with a #40 drill bit (about 3/32"), and when that's completed, drilling out to final size as called for in the plans. Since I decided to use blind rivets, final size is #30 (about 1/8").

I decided to build a hinge drilling jig for the piano hinge that holds the elevator onto the horizontal stabilizer, so I used a ~40" metal ruler and drilled a hole on every inch marker and at the appropriate distance from the hinge knuckles. This lets me clamp the ruler to the hinge and simply move along without measuring and marking out several dozen drill holes. I used a shim to space the hinge knuckles 1/16th inch below the top plane of the elevator as called for in the plans.

After assembling and drilling everything to the proper size, I disassembled the entire thing to debur the drill holes and break the edges. This is important because aluminum does not like sharp edges and corners, and burrs left in the drill holes may prevent the rivets from seating properly. I also experimented with Rustoleum Self-Etching Primer on the ribs, but since 6061 aluminum is already pretty corrosion resistant, I'm not sure I'll continue with priming the parts since it is time consuming and probably won't have substantial impact on airframe life. I'll probably stick to Corrosion X or similar once the plane is built. I don't live anywhere near coastal saltwater, so corrosion isn't a huge concern (at least, according to my local EAA chapter folks).

After deburring and edge breaking, I riveted the middle rib and hinge on using BSPS-42 blind rivets. I need to leave the inner and outer rib temporarily attached so that the inside of the elevator can be inspected before I get the okay from an inspector to close it up permanently.


 
Jan 14, 2024     First of Several Crates       Category: New Parts
Who knew an airplane could be shipped in a box? My first pieces of the build came in two large boxes. The parts themselves were wrapped very well and I didn't find any damaged parts at all. Only two small parts were missing which SPA rectified after some back and forth.

I couldn't wait to open everything up, so my living room became a makeshift part distribution centre.


 
Jan 14, 2024     Choosing the Panther Category: Research
I originally started to build a Van's RV-8 and got as far as ordering the empennage and building the vertical stabilizer. If you've followed any of the latest Van's news, you'll know that they filed for Chapter 11 a few months ago and have been working towards a recovery plan. However, this recovery means that they've raised prices on nearly every component they offer, cancelled contracts on customers that have already signed and paid for kit components while also forcing the same customer to pay higher prices for the same kit, and generally strung a bunch of people over a barrel if they were fortunate enough (or unfortunate enough) to have half an airplane already built and waiting on parts. I wasn't so far along in my project that I fell into any of those groups, and while I'd still love to build an RV-8, Van's approach left me wondering if I'd want to send cash to a Chapter 11 company along with the way they treated loyal customers. I understand Van's survival is at stake, but there's something morally wrong with squeezing current customers for nickels and dimes for parts they've already agreed to purchase, and in some cases, have already paid 100% of the purchase price and have yet to see delivery.

I came across the Panther a while ago during my initial research on homebuilding, so I started digging some more into it because I thought it looked like a cool little airplane. It's a single-seater, aerobatic capable to +6/-3G, has folding wings that'd let me store it in a corner of a hangar or even inside a car hauler, and has decent range and cruising speed. I'm most interested in the sunny Saturday afternoon loops and rolls, no real need for IFR or insane cruising range or speeds, and it seemed to check all my boxes for a simple but sporty little airplane that's just fun to fly. The big downside is that it's a single-seater, but I'd probably be doing most of my flying by myself anyways. It's much the same as my riding my motorcycle or cycling: it's an activity that I enjoy for myself, but once in a while it'd be nice to be able to share it with others.

I sent some questions to Sport Performance Aviation, and I was impressed that the owner of SPA, Dan Weseman, answered me directly with straightforward replies. Dan also designed the Panther prototype so it was nice to get direct answers straight from the source rather than through a sales department. It convinced me enough that I put an order in for an empennage kit, which I received about three weeks later.

In terms of the build itself, the plane is built from corrosion resistant 6061 aluminum, a welded steel cage encloses the cockpit from the seatback (which is also protected by a beefy roll bar) to firewall, can be solid riveted or blind riveted (I've decided to build the latter), and is generally designed to be a simple build without a huge number of complex shapes or parts to fabricate. I've decided to use blind rivets because, in my opinion, they are a little easier to build with since the various bits and bobs don't need to be dimpled/countersunk, and the very nature of blind rivets means I don't need access to both the front and rear of the work piece which makes it a lot easier to be a one person job. This is especially true when it comes to items like the tailcone where the pieces are simply too large to be able to reach around to buck rivets - my wife wasn't looking forward to being jammed into the tailcone of the RV-8 with a bucking bar and a set of ear plugs. I'm okay at setting solid rivets, but the ease of setting blind rivets is really appealing to me. Plus, I just like the look of a 'mechanical' airplane. The sleek ones are cool and everything, but there's something that calls to me about an airplane that just looks functional where you can see rivet lines along with the various mechanical things that an airplane needs to fly. I'm weird that way.
 
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