June 2013 Blog Posts (13)

Prop Pitch

My 601XL has a 69" 48 pitch currently, with a C-0200 rated at

125 HP.  At 2300RPM I am just at 100MPH, I want to be at 115MPH

at 2100RPM (RPM X Pitch X .000947 = MPH), This would call for a 69" 58 pitch prop.


What are other Flyers out there using on 125HP engines for Dia. and Pitch?


Also is 115MPH cruse acceptable and safe.


This 601xl has the wing mod.


PS: Getting 125HP out of a 0200!!, 10-1 comp pistons,…


Added by charles w jones III on June 24, 2013 at 10:47am — 3 Comments

Flying with 912iS in a CH701

One of our pilots from Brazil is transitioning to the CH701 with the 912iS.  He put a GoPro on the mount and then created with You Tube video... https://www.youtube.com/watch?v=9ijgyJhgUic - although it is speeded up, it shows a lot of interesting hand movements in the cockpit... watch carefully as you see me in the right seat moving my hands around a lot!  Also check out the full and free movement prior to take off - as well as enjoy…


Added by Jonathan Porter on June 24, 2013 at 2:31am — No Comments

ratchet v buckle straps

I used buckle straps during skin installation on the stabilizer. I found them much easier to set up and they were half the price of ratchet straps as well. I thought I just share that in case sombody else dosen't like ratchets.

Added by Krzysztof Kacprzak on June 23, 2013 at 6:04am — No Comments

CH-701 Elevator Confusion

Plans indicate the trailing edge beveled edge on the top of the elevator pointing 15 degrees up, causing a permanent down trim.

The instructions indicate in two separate places, the beveled trailing edge should be on the bottom of the elevator creating a flat and  neutral lift trailing edge.

My question is:  which is the correct?

Added by Patrick L. Hatfield on June 18, 2013 at 9:54pm — 4 Comments

Back on the air - Ustream

Solved some technical issues....so back on the air live.  Retired now so spending quite a few hours/week on this project.  Camera is currently focused on the seat area.  The channel is mostly for my kids/grandkids, but you're welcome to visit.     ustream.tv/channel/stevebetsy

Added by Steve Johnson on June 17, 2013 at 5:00pm — No Comments

Safety wire/pin?

I just installed the 750's rear bracket on the horizontal stabiliser, which requires two bolts as well as rivets. There is no mention on any safety wire or pin through the nut or the tip of the bolt. Is this correct or am I missing something. I don't want to rivet on the skins and then discover that I missed it. Any advice is welcome. Regards from Ireland.

Added by Krzysztof Kacprzak on June 17, 2013 at 7:44am — 2 Comments

Making sure the fuel sender is sealed

Hi Builders,

I wanted to make very sure that my fuel senders were sealed before putting the tank in the wing and then filling it with fuel in the future!


The builders guide says the screws should have fiber washers under the head for sealing. These are no longer provided in the supplied VDO install kit. It sounds like a very good idea to have a fiber washer to help seal or a copper washer - like the seal washer used in banjo fuel fittings. I am also using the…


Added by Larry Zepp on June 16, 2013 at 11:13am — 5 Comments

Livraison du 601

ICI en France,

Le club ULM "Bulles d'Air 51" à pris livraison de son ZENAIR 601 UL.

Avec un moteur Rotax 912S. La déco n'est pas encore finie.

Vitesse mini mesurée: 51 km/h  &  Maxi: 198 km/h !


Added by GRIMM Edgar on June 15, 2013 at 8:58am — No Comments

Airfoil streamline for front landing gear

Does anyone have a source for an aluminum airfoil shaped fairing that one could placed around front gear tube?

Preferably open at back so could be slipped around gear tube and then riveted shut and riveted to gear tube for stability.

Added by Jerold Ebke on June 9, 2013 at 1:45pm — 8 Comments

Catto prop and Cummins Spinner

Dave, Catto did do a one off or us. He made two at the same time. I had one of his three blades on my RV 6 and I loved it. I knew from the start I wanted one for the Zenith. The spinner is from Allan Cummins in Australia. What a sweet combination at least that is what I think! Catto now has all the data to make them for the Zenith an UL.

Added by Mike Norton on June 7, 2013 at 9:08pm — 1 Comment

Wings Start!

Started the CH 750 wing build this weekend by conducting a first pass at form molds for the nose ribs and rear ribs, The center lightning hole on the rear rib is slightly off as that was my first attempt with the fly cutter. Will get some more lumber this week and try it again next weekend.

Added by David A. Judkins on June 2, 2013 at 11:53pm — No Comments

Dorsal Fin

Trimmed and fitted forward dorsal piece to LE of horiz. stab.  For those that have done this, you know it takes a lot of small trimming and fitting.  The real artsy exercise is the aft piece which I have now completed.  It took considerably longer.  I plan on attaching these with nutplates and rivnuts instead of riveting.

Added by Norm Neuls on June 2, 2013 at 1:53pm — No Comments

CH701 nav light circuit breaker

701 builders: what trip value circuit breaker are you using to protect the nav light circuit of the Aeroflash dual (strobe, nav) light unit?  The units were supplied by Zenith as an option for my 701.  For a while during phase 1, I had a bad ground for the right wing nav light and could never tell during flight whether the light was working or not.  If I thumped the wingtip while in the hangar, the light would come on.  Aeroflash says the current draw for a 12V system should be 2 amps per…


Added by Don Herbel on June 1, 2013 at 3:07pm — 5 Comments

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