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Stephan's Sonex #1627 Builder's Log | Engines | UL Power

http://sedelman.com/p/236/l/281/t/Engines-|-UL-Power

Stephan's Sonex #1627 Builder's Log. The UL Power UL260i appears to be a solid engine. It is a purpose-built full FADEC engine developed in Belgium and capable of developing approx. 97 HP at 3300 RPM and 8:1 standard compression. The UL260is develops 107HP at 3300RPM, but runs at 9:1 compression. Typical long term engine reliability is proportional to the compression ratio, where higher compression ratio decreases the MTBF. A review of the NTSB accident database for the UL Power engines revealed a single...

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Stephan's Sonex #1627 Builder's Log | Logs

http://sedelman.com/p/240/l/284/drawing/SNX-T02

Stephan's Sonex #1627 Builder's Log. All that remains now is to debur, polish and prime the ribs and to rivet the bottom portion of the elevator. The top portion will have to remain cleco-ed until the MD-RA inspection is complete. Tail - Horizontal Stablizer. I worked on installing the left hinge on the horizontal stabilizer today. I again used the elevator as a guide and added the end-stop to ensure everything is flush with the edge of the stabilizer. Tail - Horizontal Stablizer. The longest rib did not...

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Stephan's Sonex #1627 Builder's Log | Logs

http://sedelman.com/p/240/l/284/catid/850

Stephan's Sonex #1627 Builder's Log. Tail - Horizontal Stablizer. Tail - Horizontal Stablizer. I worked on up-drilling the entire horizontal stabilizer and elevator assembly. Tail - Horizontal Stablizer. I worked on installing the left hinge on the horizontal stabilizer today. I again used the elevator as a guide and added the end-stop to ensure everything is flush with the edge of the stabilizer. I positioned the elevator with the hinge pieces in place and drilled and cleco-ed everything together. The l...

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Stephan's Sonex #1627 Builder's Log | Logs

http://sedelman.com/p/240/l/284/catid/849

Stephan's Sonex #1627 Builder's Log. Tail - Vertical Stabilizer. I finally riveted the left side of the veritcal stabilizer. I also attached the fiberglass tip. The fiberglass tip is actually snug against the leading edge of the vertical stablizer skin without any gap, but the skin on the other side is open making it look like there's a gap. Tail - Vertical Stabilizer. I'm ready to rivet one side of the vertical stabilizer, but I'm waiting on feedback from Kerry at Sonex to find out if it is acceptable t...

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Stephan's Sonex #1627 Builder's Log | Logs

http://sedelman.com/p/240/l/284/catid/855

Stephan's Sonex #1627 Builder's Log. I built two EAA work benches according to the official plans (click here. I ended up buying a lot of tools. I strongly believe that you need the right tools for the job otherwise the build process could get more frustrating than it needs to be. You could probably do with less. Dremel Saw (for cutting skins). Alodine 1201 Application Note. Alumiprep 33 Application Note. GBP 988 Primer MSDS. Phone: 416 479 0786.

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Stephan's Sonex #1627 Builder's Log | Logs

http://sedelman.com/p/240/l/284/catid/852

Stephan's Sonex #1627 Builder's Log. I completed the rudder today. This involved deburring the edges and the #30 holes of the ribs as well as skins, and of course, cleaning and priming the parts. The skins were primed where it comes into contact with the ribs. I riveted the long side of the rudder, so it would still be easy to open up the skins for the pre-cover inspection. This is required for Canadian amateur built aircraft (click here. Ribs deburred, sanded and cleaned with alcohol and then primed.

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Stephan's Sonex #1627 Builder's Log | Engines | Jabiru

http://sedelman.com/p/239/l/280/t/Engines-|-Jabiru

Stephan's Sonex #1627 Builder's Log. The Jabiru 3300 is a 120HP purpose-built aircraft engine officially supported by Sonex. This appears a solid engine overall and it often a choice by Sonex builders who want the additional power. However, I have reviewed a number of Sonex build logs and have come up with the following observations:. High CHT temperatures, even after break in. Requirement to frequenty re-torque the heads/bolts. Front Cylinder head must be cut to fit cowling. Alodine 1201 Application Note.

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Stephan's Sonex #1627 Builder's Log | Logs

http://sedelman.com/p/240/l/284/catid/851

Stephan's Sonex #1627 Builder's Log. All that remains now is to debur, polish and prime the ribs and to rivet the bottom portion of the elevator. The top portion will have to remain cleco-ed until the MD-RA inspection is complete. Now that both the left and right elevators are done, the next step is to line them up and attach the control horn. This will require that I use my 8ft workbench. The next step is to work on the left elevator. I ended up drilling out the 3 bad rivets. I had to use a wrench t...

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Stephan's Sonex #1627 Builder's Log | About the Builder

http://sedelman.com/p/231/l/273/t/About-the-Builder

Stephan's Sonex #1627 Builder's Log. I was particularly troubled by Zenair's position with respect to the accidents. The company insisted that if the builder had built the plane to the manufacturer's specifications, that areodynamic flutter would not result in a catastrophic breakup. This sounded a bit like:. The decision to toss the Zodiac as a serious option came after reviewing the FAA Special Report. The manufacturer’s analysis used an assumption that the lift distribution has a purely elliptic...

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Stephan's Sonex #1627 Builder's Log | Logs

http://sedelman.com/p/240/l/284/catid/856

Stephan's Sonex #1627 Builder's Log. I settled on the LT3759. This is an MSOP package chip and available in the industrial temperature range (-40°C to 125°C). This is important, as I may decide to have the MCU firewall-forward, as it will be easier to connect the thermocouples and other sensors this way. The output of the SEPIC controller is the green line. You can see it is fairly steady at 12V regardless of the input voltage. The noise is approx. 400mV p-p at a frequency of 300kHz. I'm ...Revised Power...