All Blog Posts (1,651)

A little preventitive Maintenance on my plane

One of the fun things about owning and building a plane is that it is an on going maintence project. Some planes are famous for the amount of ground hour to flight hours. For example the F15 eagle and other fighters had a 4 to5 to 1 ratio! Meaning 4 to 5 hours of maintenance to 1 hour of combat flight time. With our trusty Zodiacs, I find it to be the inverse 4 to 10 hours of flight hours to 1 hour of ground required maintenance. Now that is value! Now ground…


Added by Juan Vega on December 10, 2010 at 2:00pm — 3 Comments


Dear friends and fellow builders,

The summer flying is over, the lawn mowing is done, the garden veggies are in the freezer and the leaves are raked and hauled away. Winter is setting in once more in Pennsylvania so its time to tuck my 701 safely away.

Its been two years since…


Added by ulis temos on December 9, 2010 at 9:00am — 9 Comments

Started on the stabilizer

Cut out the 0.025 stab rear spar & the elevator spar (the Olfa knife certainly makes it easier!)

I then came across a problem - my home made bending brake is only about 1300mm long, and the spar is 2220. However, by taking it slowly and bending a few degrees at a time along the length, I got both edges done.

Looking forward to forming the stabilizer ribs and putting it all together.

Oh, received my riveter heads…

Added by Marty de la Motte on December 9, 2010 at 4:45am — No Comments

New On-line Parts Catalogs

In Europe where most owners of a Zenair design acquired their aircraft "ready-to-fly", pilots and mechanics seldom have access to the original drawings for maintenance and repairs. Not having exact part-numbers can often cause confusion and frustrations when attempting to order replacement parts.…


Added by Michael Heintz on December 7, 2010 at 5:30pm — No Comments

Holiday Down Time

Tried to pace my 701 to have some "free time" around birthday and Christmas. Evidently I overdid it. Here is my latest build. The jig for my slats which are on order, but won't ship till the 13th ;-(

Not good at waiting, but bet I am not the only one who folded to family pressure and reduced 701 activity for…

Added by David Abbott on December 6, 2010 at 6:17pm — 1 Comment

Lycoming IO233

Have ordered an IO233 for $23K due in 60 days. Is anyone out there also going with this engine? Would like to share in the design of this installation.

Added by Ron Belknap on December 1, 2010 at 10:19pm — 19 Comments

Fuel tank Installation

It appears the fuel tank is sitting on the lower skin, cushioned only by cork strips. Am I missing something here??? Thanks for any replies.

Added by Reggie Seaman on December 1, 2010 at 3:00pm — 3 Comments

Gettin there

Finished up outboard flaperons today, gonna do the inboards after the fuse. I'm finished with wings, elev. & stab., rudder, & slats. Gonna have a big shop cleaning tomorrow, then dig all the rear fuse parts an skins out of the big box and finally get started on the fuse. Happy Day!

Added by Mason Bullard on November 27, 2010 at 9:33pm — No Comments

New Builder Completions

The following is from the Kitplanes magazine website:

Philip Smith’s Zenith CH 701


Added by Sebastien Heintz on November 27, 2010 at 8:00pm — 2 Comments

Zero ground run for takeoff?

Does anyone have a reference for a video of a CH 701 taking off with very strong headwind and zero ground run?

Added by David Abbott on November 25, 2010 at 6:26pm — 5 Comments

Rudder skeleton

I bought Jon Croke's excellent DVD on scratch building, which gave me heaps of ideas and methods that I probably wouldn't have thought of myself.

Made a bending brake just out of a hinged piece of Tas Oak on the side of the workbench (with another piece on the top which has an aluminium strip screwed to the edge with a 3mm routed edge for bending). At the moment I just screw this to the workbench when bending something, but have just bought a very stiff length of square section extrusion… Continue

Added by Marty de la Motte on November 24, 2010 at 4:52am — No Comments

Winter Preheating: Best ideas, strategies, methods, etc.

This would be an ideal time of year to hear from the Zenith forums & bloggers about their tried and true ways to preheat their aircraft. Please posts your ideas and share how you get her warmed up for Winter flight.

On my 500 hour 601XL-B, I use an electric automotive oil pan heat pad (45 mins.) and I also use the electric small milkhouse heater (45 mins.) (the one posted on the Jabiru site). I put a flexible metal tube on the heater and…


Added by Mark Ertz on November 23, 2010 at 6:02pm — 6 Comments

short flight after modifications to plug wires & oil cooler

On Monday rolled out the 801 with the cowling off, warmed up the engine and reset the idle to 800 RPM warm, put the cowl back on and added some fuel then rolled to Rwy 22 for another test flight. Plane came off the ground after only a short roll and was climbing at 80 MPH, cylinder temps remained within the limits and noted the oil temp had dropped to 220-240 F and held there, EGT s remained balanced throughout the flight. Flight was very bumpy as a storm was brewing just south of the airport… Continue

Added by Phillip Owens on November 23, 2010 at 4:24pm — No Comments


I have finished the rudder and the firewall. Rudder took some time, allot of hole to drill, enlarge, debur, cleco, and then rivet.Feels good to have a few assemblies done. On to the next one, I think it is going to be the Elevator.

Added by Paul on November 23, 2010 at 11:33am — 2 Comments

Newsletter #181 (November-December) Mailing now!

If you are a Zenith builder and not a subscriber, send me an email ( and I can send you a back issue sample of the newsletter and DVD. To renew, or subscribe, click here.…


Added by Zenair News on November 21, 2010 at 5:00pm — No Comments

plug wire changes

I had noted the plug wires as originally run appeared to be blocking airflow into and around the cylinders, so to improve the airflow I changed the location and manner in which the plug wires were run. The photos posted are only a few of those that tell the story of the change and I will try to include more photos as allowed. Take notice of the clear air pathway thru the intake plenums and how the plug wires now are barely visable within the plenum. I also made use of the old plug holes to…


Added by Phillip Owens on November 19, 2010 at 4:04pm — No Comments

What Ever Happened To The Zodiac Gemini CH620?

A question for all the Zenith builder & fans out there..."What ever became of the Zodiac Gemini CH620?"

I have the factory information about the aircraft it. I stumbled across the literature while going through a stack of aircraft sales pitches I collected over the years. For those of you who have never heard of this aircraft it looked like a it was a version of the CH601HDS series, with retractable tri-gear and twin Rotax 912 80 hp engines on a low wing. It was a two seat…


Added by Bob McDonald on November 18, 2010 at 9:30pm — 8 Comments

Suzuki 1.3 Raven Conversion cooling, need information

I have installed a 2000 Suzuki 1.3 fuel injected engine in my CH701 on amphibious floats. For initial ground running I have connected it to the radiator that was used for a Rotax 618. I'm not thinking this will be the cooling system I will fly with and am looking for information on radiator and cooling system installation from anybody who has installed this engine in a 701 and had thought they had a good cooling system.


Added by Phillip D. Tedrick on November 17, 2010 at 10:42pm — 7 Comments

Education Day and Air Show in Ghana

What a weekend... after having taken two STOL CH 701's around the country just two weeks ago, we then ran an education day - and an air show weekend!!! Errrr not like Sun'n Fun nor like Oshkosh... more like.... well, I guess you will have to read on...

We live, work and operate in…

Added by Jonathan Porter on November 15, 2010 at 2:00pm — 3 Comments

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