jeff will
  • Yalaha, FL
  • United States
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Squaring the fuselage

Started this discussion. Last reply by Joshua smith Apr 13. 3 Replies

Has anyone ever had any issues with squaring the 750 fuselage? My fuselage came recently and there were almost all pre drilled holes already. I guess the fuselage should be square once you cleco it,…Continue

750 edition 4

Started this discussion. Last reply by Jason R Mar 24. 2 Replies

Has anyone changed their plans from edition 3 to 4? I found a list showing the changes and a letter from the zenith about updating your plans if need be. Roger at zenith told me the changes were…Continue

Lycoming o-235 baffling

Started this discussion. Last reply by jeff will Mar 23. 10 Replies

Does anyone have access to drawings or sketches for the baffling or airbox for the 750 stol with the o-235? Id like to build as much from scrat h as possible, plans would just  make it a little…Continue

Prop clearance

Started this discussion. Last reply by Walt Snyder Mar 29. 4 Replies

As anyone had any problems with prop clearance to the ground with a lycoming installed on the 750? Im still building mine and was curious. Im about to start building the fuselage now and was…Continue

 

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jeff will posted a discussion

Squaring the fuselage

Has anyone ever had any issues with squaring the 750 fuselage? My fuselage came recently and there were almost all pre drilled holes already. I guess the fuselage should be square once you cleco it, since you cant really change it at that point anyway. Thoughts?  ThanksSee More
Apr 13
jeff will posted a discussion

750 edition 4

Has anyone changed their plans from edition 3 to 4? I found a list showing the changes and a letter from the zenith about updating your plans if need be. Roger at zenith told me the changes were minor, nothing structural to worry about. Just curious,See More
Mar 24
jeff will posted a discussion

Lycoming o-235 baffling

Does anyone have access to drawings or sketches for the baffling or airbox for the 750 stol with the o-235? Id like to build as much from scrat h as possible, plans would just  make it a little eaiser. ThanksSee More
Mar 19
jeff will posted a discussion

Prop clearance

As anyone had any problems with prop clearance to the ground with a lycoming installed on the 750? Im still building mine and was curious. Im about to start building the fuselage now and was thinking. Ive ordered the tundra tires if that makes any difference. ThanksSee More
Mar 11
jeff will posted a status
"Does anybody know the difference between editions 3 and 4 for the 750 STOL?"
Feb 1

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STOL CH 701, STOL CH 750
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750 edition 4

Posted on February 1, 2018 at 5:33pm 3 Comments

Does anybody know the difference between the editions 3 and 4 of the 750 STOL?

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At 9:06pm on July 11, 2017, John Miller said…

Sorry about that , ( darn Spell Check ) ... Yes angle of Attach.  Main reason for the AOA  device is for Landings, ( a Negative Power maneuver VS Take Off a Positive power action )...

. If you do not open up the Slats you will not gain their benefit  That's why the tail shoots so far Upward to allow an aggressive rotation on Take Off as well as an Aggressive AOA , nose UP attitude , for short Field Landings So,  that means a greater AOA and a slower Air Speed., ( and a shorter landing speed and Landing roll which is what the 750 STOL is all about ).

The induced drag from the Tundra tires is not a Huge factor during take off where the air speed is relatively low. ( Just slows you down at cruse ! ).

As I said earlier, I have not really tried to " hang it from the Prop" on Take Off or Landings. . But even just flying it as a "normal" aircraft the extra Hp of the O-290 sems to make up for the extra weight.... My Gross is down a little bit and the gas consumption is up ... BUT everything is a trade off.  For me the extra power and larger tires mean that I will be able to get in and out of my 1,660'  grass strip, ( once it is completed ), latter into the Fall and early Winter and start flying earlier in the Spring !

Where you will gain with the O-200, is in fuel  efficiency and range. You will have a typical Zenith take off roll and at landing you should be about as short as me with the O-290.  Again, landing is a Negative Power maneuver so you do not need the thrust  required for a short take off roll and climb out....  

Hope this helps,

John

At 7:20am on July 11, 2017, John Miller said…

RE:

hi john,
I saw your airplane has a Lycoming installed. How is the performance?, since mine will have a Lycoming as well. thanks
------------

Hi Jeff,

Yes it has an 0-290-D2,  135 Hp. continuous , ( 140 for 5 min. )  With a Catto  carbon fiber 3 blade prop., With an Oil Cooler.  Mags are  "E-Mags" electronic ignition. So far working Great.
Over the last year  I have been tied up with family medical issues. And when not involved with that , busy building a runway here at the house.... So, needless to say the plane has not been flown much.  I have not really tried to find the real flight envelope yet.
But a couple of things...  On the 1,200 mile trip back from Kansas average gas burn was 6.7 GPH. Given the standard 24 gal. fuel capacity ... round it up to 7 GPH and a cruse . ( with the 29"  tundra tires on it ) , at around 75 mph , figure a range of around 200 miles max. ( Zenith cut sheets show figures for an O-200 , 100 Hp. with standard size landing gear... ).  Our longest leg was 172 miles that burned 15.3 gal. ....
IF you already have not done it.... consider replacing the std. Lyc. Screen Oil filter with   " B & C Specialty Products" 90 degree.  oil filter adapter kit for Spin on Filters.... Nice looking product . You will thank yourself each time you change the oil ! ( also Consider using  " Cam Guard" as an additive ..
The case breather on the O-290 is located right above the front main bearing that likes to splash oil up into / towards the breather... We went through a lot of oil on the trip back ... Belly had CLEAN oil .( Stacks were clean, Compression is good ).... The way the breather tube was run was straight down then under the engine then back up at the firewall then back down... Like a big  " U " that was trapping the oil... " Air Flow Systems" makes an inline Air / Oil Separator that I have picked up , but not as yet installed....  I will rotate the Case Vent 90 degree threaded fitting UP and run the vent line over the top of the engine so that the collected oil will drain back into the case... ( AND will wrap the unit in fire sleeve to make sure that the water vapor does not freeze ). Then connect it to the existing plumbing at the firewall keeping the "whistle hole" in place.
Get rid of the Cork Valve Cover Gsk and go with a set of Prem  Neoprene Gsk, (  as you go along Aircraft Spruce will be your new best friend ).
To get the most out of the 750 STOL leading edge Slats you need to " open them up" . That translates into a High Angle of Attach.. ( the last plane I had was an M-20-F Mooney TOTALLY different way to take off and land ).. Any way. the new Buzz word in GA, ( but ancient history with the Military ), is Angle of Attach. The 750 will sink like a rock.... It is supposed to get down in a short distance , so be ready to add power just before touch down... With the O-290 I have yet to get the feel for how LITTLE power is needed. With 135 - 140 Hp sitting there it is Very easy to hit it a little to hard and up you go ....
Ok , AOA... to get the Slats at the Best angle and stay away from stalls , AOA is more important than Air Speed.... At Sun and Fun this year picked up an " Alpha Systems" , model "Eagle" AOA  kit. A bit on the high side cost wise , but given the nature of the plane and what I will be flying out of , ( 1,660' grass with 100' trees at each end ) , I see this as becoming an unofficial Primary Flight instrument for the 750.
The Garmin Pil
 
 
 

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