Evan West

Good to know, Like I mentioned I just wanna cram two of my 180 pound friends back there once in a while for short hops. Weight and balance says its fine (if i dont fill the tanks) and within limits. Just got tripped up on the "300 lbs rear seat limit"

No particular set of circumstances that requires it other then wanting to and having the ability to. As far as loosing top speed goes that will be relative to the prop you had before. If you have a fixed pitch cruise prop then you could see a few knot loss with a CS prop (this still may not be the case as many of our installations on various aircraft gain 2-4kts ) but if you have a fixed pitch prop pitched for climb/takeoff then you should see a gain in your top end with a CS prop. For the most part I totally agree that for most people it is not needed.....as a propeller engineer I just want to do it

Unfortunately we only do hydromecanical CS props 😕

Sent him an email!

Any advice on finding half done projects/2md hand parts. The for sale here dosen't seem overly active. I'm not so concerned about end cost but the airframe cost is roughly what I will spend over the next 2-4 years to get started on it. I can save for engine, avionics and prop.

Did MT/a repair shop quote you $8000 to fix the prop? The first question is if your engine has provisions for a hydro-mechanical CS prop.

Haha yeah I will start in on the garage reno as "phase 1" of the plane build. Also I happen to be bias due to my employment and will be putting a Hartzell CS prop on it ......provided it passes vibration surveys.

Good info, yeah working for a major prop manufacture (Hartzell Propeller) I am well aware of the issues with pushers and CS props. I am looking into doing retractable gear mainly for extra clearance on rotation for the prop and to get the gear track outside of the prop disc to help save the prop some. Im just interested in the CS prop to both minimize takeoff roll and maximize cruise speed. Lucky for me my home airport and most destinations I want to go to regularly are ~5000ft or more paved runways. Attached is a screenshot from my weight and balance sheet. According to it the MTO is 2175lbs. If I take that as my MTO then I can fit 4 people and partial fuel for short runs to get food or visit friends in the next state over.....provided the back seat can do 360lbs. The back seat weight has a small effect on CG but it is stated that "structural limit is 300lbs".

Hey all, Im a propeller engineer living in the Dayton OH area. Working on my private pilots licence and will peruse IFR after. (Im the guy on the left in blue in my profile picture) Im looking to start scratch building a Cozy-IV. Some day the plan is to build a Velocity turbo XLRG but that will be ~$250k so that has to wait. What doesn't tho is scratch building the C-IV. I was originally looking at building a long EZ however I know id quickly grow out of it as my goal is to take myself, my 2 dogs, and occasionally a passenger or two, cross country fast. So ive pretty well settled on a C-IV. Once I finish renovating my house I plan to get myself some plans and start in on it. Being a propeller engineer I plan to get a constant speed prop put on the thing, curious if anyone else has a CS prop currently? Lots of other newbie questions: 1) Why is the rear seat weight limit in the Cozy-IV 300lbs? Is this arbitrary like the "300lb front seat limit"? I have several pilot friends and we all weigh ~180lbs and id like to put two 180lb people in the back for short breakfast runs (ik its cozy back there lol) 2) What is the max takeoff weight? I think ive seen 2050lbs quoted most often but the CG calculator sheet I found (from cozybuilders.org) has 2175lbs as the max?? 3) I see lots of talk about nose extensions on the Cozy....Why? 4) Price estimate to build the airframe only? My best guess is 18k-20k?