All Blog Posts (1,897)

Looking for a William Wynne Corvair engine

Looking for one already built up so I could install it this winter.  Fuselage about all done except engine controls.

Added by Ralph Sonnicksen on November 11, 2011 at 7:31pm — 2 Comments

Nice touch-up to the site format

I find things more readable. Good job!

Added by Jim B Belcher on November 11, 2011 at 8:11am — No Comments

UL350is performance in hotter climates

Phoenix hot i mean;)  Since i'm just putting wings together, I will need a fuel return line if I chose the UL engine.  So my decision may come sooner than i had planned.


Does anyone know of any cooling issues with this engine similar to others?   I'll be flying mainly in the Phoenix area.


Also, Are the 650 extended range tanks plumbed for a return line?


Thanks mucho!!  



Added by Peter Keast on November 10, 2011 at 3:22pm — 1 Comment

UL Motor Mount for the 701?

Is there anyone currently making a 701 motor mount for UL power?

Added by John Edwards on November 10, 2011 at 12:01pm — 4 Comments

Zenith CH 650 vs. Sonex: "Competitive Comparison"

The following is an unusual post because I don't normally comment negatively about competitors.  Competition is good for any industry, forcing us to be innovative and efficient, and there is a place and market for many different airplane designs (and the companies that manufacture them): The current issue of Kitplanes magazine (December 2011) contains the annual Buyer's Guide with 316 different kit aircraft listed (from nearly as many manufacturers)!

The letter that…


Added by Sebastien Heintz on November 8, 2011 at 7:30pm — 9 Comments

Thanks So Much for the "More" Button!

I've been wishing for the last year and a half to be able to see recent posts.  I go on every day (almost), but they still get past me sometimes.

Added by Joseph F. Truncale on November 7, 2011 at 4:09pm — 1 Comment

100 Hrs In

This weekend marked the 100th hour of build time and the official start of the wings. Thanks to a bunch of rookie mistakes and some plain old carelessness I think I am probably about 20-25 hours behind a "normal" build time (whatever that is) but I am quite pleased with what I've managed to do: the rudder, the slats, the flaperons, the horizontal stab, the elevator, and the nose ribs/slat support assemblies.



Added by Paul Sanders on November 7, 2011 at 4:01pm — 1 Comment

Adding fuel return fitting

I'm building the wings on my 650  and the fuel return fitting in on the outboard end of the tank, I talked with Zenith and they said something about that end is better to prevent condensation from getting into the tank from the return line???

Anyway, instead of running a long fuel return line outboard to the next lightening hole I'm considering welding a return fitting in the upper inboard end of my tanks.

Has anyone else done this or is there any reason I shouldn't do…


Added by Tom Neal on November 7, 2011 at 7:39am — 1 Comment

Fuel injected engines

In a previous blog about the ULPower engine in the 650 there was a discussion about fuel use.  Since these engines use fuel to cool the injectors and send the excess fuel by return line back to the tanks I was wondering how the GPH fuel use is determined. Seems that a fuel flow sensor in the line to the engine would not give a correct reading.  Just wondered how it was done.

Added by Joe McGough on November 6, 2011 at 10:30pm — 5 Comments

Women Building & Flying in Africa on BBC World

On the Health Show broadcast on BBC World news today, Patricia and Jonathan talk about building and…


Added by Zenith.Aero on November 5, 2011 at 3:23pm — 1 Comment

Zenith CH 650 Performance with UL Power engine

We finally had the chance to document some basic performance numbers of our new CH 650 with the UL Power UL350iS engine.  Yesterday was a beautiful autumn day so Zenith demo pilot Roger and I took the CH 650 up for a…


Added by Sebastien Heintz on November 5, 2011 at 9:00am — 15 Comments


Well summer and fall came and went and I didn't do a darn thing on the plane...debating on whether to get my materials ordered so I can work on stuff over this coming winter. But will I have time? Home repairs and other life setbacks have really gotten in the way!

Added by Greg Harris on November 2, 2011 at 6:56pm — 4 Comments

My new favourite tool

I'm probably the last person to catch on, but I recently bought this Olfa P800 knife for trimming skin edges and it is fantastic. No more snips and scotch brite for me.

Have to thank plane builders for sharing their tips online and unwittingly guiding me to the right blade.

Added by Paul Sanders on November 2, 2011 at 9:23am — 4 Comments

Popeller pitch and size

What is the best propeller to put on ch701 with jabiru 2200 engine ??? What should the rev-counter read at full throttle when taking off and climbing ??? I can only get to 2600 rpm maximum throttle which I think is not enough. Any information will be appreciated.

Added by Shafid Khan on November 2, 2011 at 12:45am — 2 Comments

Airborne At Last!

Six years after ordering my kit from CZAW, ZK-ZMX finally took to the skies with test pilot Jerry Chisholm at the controls.


Omaka airfield owned by the Marlborough Aero Club is a little too big for this aircraft .I'll get closer for better shots as soon as I can

Added by Jock Struthers on October 31, 2011 at 9:55pm — 3 Comments

Jabiru 3300A Oil Pressure sender failure

I have had another oil pressure sender failure. Thats 2 in 25 hours flying. Failure mode as follows;

works fine then you get the ocasional spiking high oil pressure indication of 70 - 100 PSI. This gradually becomes more regular until it stays on 100 PSI. For ground running tests I have connected a direct reading gauge to the oil galery to confirm a normal 40 PSI oil reessure.

Has anyone else experienced similar failures?

Added by Ian McClelland on October 30, 2011 at 9:25pm — 4 Comments

prop change

changed the prop today  goes like a home sick angel  after 5years  450 foot a min to 900 foot amin  the engine o200 r r has not worked for all this time  it goes like a rocket   ray

Added by raymond lasnier snr on October 29, 2011 at 3:53pm — 1 Comment

Working on spars

Got the root doublers, strut attachment doublers and tip spars bent up the other day.  Due to the happy combination of a Saturday morning to myself and the kids both sleeping for 3 hours in the afternoon, I pilot-drilled the doublers & L stiffeners to the spars and cut the extrusion to shape for the front strut attachments.

After some solid riveting practice, I'm now ready to attempt riveting the spars together... nervously... (jeez I'd hate to bugger it up on the last rivet!!)

Added by Marty de la Motte on October 29, 2011 at 6:00am — 1 Comment



I keep telling all the locals that it’s Bob Mac Donald who is sending all the geese to eastern Pennsylvania. Coming home from the last fly in the flock that flew past me where honking in French, I must be mistaken; they may be coming from Quebec.…


Added by ulis temos on October 28, 2011 at 3:09pm — 3 Comments

Wing and CH650B photo guide questions

Hey Folks,

I have a few questions.

I'm currently working on the 650B wings, and will likely go with a single dynon skyview display...i will be using the dynon AOA pitot which i will have to purchase now.  

1.  Are there any other sensors/components that have to be installed in the wing for skyview?  (besides AOA Pitot)

2.  Does the Dynon AOA pitot come with a cable assembly, and if not, from your experience, where can such a cable be acquired (or i can make) and…


Added by Peter Keast on October 26, 2011 at 2:37pm — 4 Comments

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