Follow us on Twitter Follow us on FaceBook Kitplanes Videos Get RSS Feed
 

Shop Talk

November 2015 Issue




The New Guy

Going off-plans.

I consider my project to be more "owner assembled" than Experimental. I don't write plans, I follow them. But is it OK for me to go off-plans? Can I add modifications? The simple answer is, yes. No matter what I call my project, it is still Experimental, which gives me some leeway in the way my final project will look and feel. Even the new guy can make modifications, but I never do that by myself. Here are 10 tips about mods and going off-plans:

1. Going off-plans adds significant time to your project. Even small changes will add to your build time. My avionics tray cost me three weeks, but I love my avionics tray.

2. Does the modification affect safety of flight? I never go off-plan on these mods. My plane has magnetos and a carburetor. I'm really overly cautious here. Keep safety issues at the top of your list.

This rudder cable fairing should give me an extra five knots!

3. Some mods are wishful thinking. More speed? Better economy? Lower operating costs? These can cost time and money and not give you the results you expected. Do your research and listen to advice from flying projects.

4. Remember, weight is the enemy of flight. Consider the weight penalty of your mod. These build up over time, so one modification might not make a difference, but many can.

5. Is saving money a good reason to go off-plan? Think about the long-term impact of saving a few bucks. Using cheap electrical connectors is not a good idea. Using an automotive alternator? That's OK with me. Lots of flying planes do that, and there are lots of examples where the automotive industry has advanced and the aeronautical world has not. But never save money if it affects safety of flight.

6. Is this a well-documented modification? Are there many examples of this mod flying? This is not really going off-plans, it is just a plans addendum.

Easy entry and exit.

7. Is the mod a kit I can buy that many others have already done? My nav lights fall into this category. LED lights for wings and tail that many others have used will be a great update to my plane. It will save a few bucks and a few pounds as well!

8. Be sure you understand the maintenance implications of an off-plans modification. Does it need extra work at condition inspection time? Does this mod have a limited service life?

9. Is the modification legal? Just because it's an Experimental aircraft doesn't mean you have carte blanche freedom. Using bolts from the local hardware store or building your own transponder may not get you past inspection. For some mods, getting in touch with a DAR early may be a good idea.

10. If going off-plan involves a new vendor, do your homework. Make sure they are going to be around for support. If not, can you support this mod yourself?

The parking brake valve is pretty important to me, and I'll add it to the annual condition inspection checklist.

Building an Experimental aircraft is possible even if you are not an aviation engineer. Thousands have done it! Modifications are a natural part of the process and even expected in certain areas such as avionics. When considering modifications, keep safety as the top factor, then add cost, time to build, performance, and cool-factor after that.


David Boeshaar is a systems analyst for corporate Disney. A former mechanic, teacher, and computer help desk guru at a major university, he is now building a Van's RV-9A for fun with his brother-in-law. As the new guy in aviation, Dave has learned lots, both good and expensive, and hopes to pass along a little help to the builders coming up behind him.

Download File

Homebuilder's Portal by KITPLANES
Dynon Avionics' latest-generation SkyView integrated avionics called the SkyView HDX has a newly designed bezel and user controls for easier use while flying in turbulence, plus brighter displays and a reworked touch interface. Larry Anglisano takes a product tour of the HDX with Dynon's Michael Schoefield in this video.
At Sun 'n Fun 2016, Dynon continued to push into the world of non-certified avionics with its SkyView SE, a less expensive version of its popular SkyView EFIS system. Paul Bertorelli prepared this video report.
The G5 is a self-contained electronic flight instrument, which can be interfaced with Garmin's G3X/Touch avionics and autopilot for backup and flight instrument redundancy. The GMA245 and remote GMA245R Bluetooth audio panels have advanced entertainment input functions and onscreen programming.
At Sun 'n Fun 2016, Just Aircraft is showing off its new Titan-powered SuperSTOL XL. Harrison Smith took Paul Bertorelli for a half-day demo flight in the new airplane, and here's his video report.
Kit manufacturer Zenith Aircraft Company has released a new 360-degree VR short video to showcase its kit aircraft and to promote the rewarding hobby of kit aircraft building and flying light-sport aircraft.
Whether you are upgrading the audio system in an older LSA or experimental or building a new project, PS Engineering and Garmin have non-certified audio panels equipped with advanced features better suited for smaller cabins.
Video Archive

IMPORTANT CUSTOMER SERVICE NOTICE TO KITPLANES SUBSCRIBERS:


All mailed correspondence, including subscription invoices, renewals, and gift notices, will bear our address:
PO BOX 8535
Big Sandy, TX 75755

Third parties claiming to be selling KITPLANES subscriptions are not legitimate.