Hatz Biplane Association

Hi Jerry,
209(b) Edo 89-2000 floats and water rudder in accordance with Edo Dwg. 14390 or 69470. None of these restrictions apply to an Experimental-AB aircraft. The combination of a certified engine/propeller will allow a 25 hour test period, a non certified combo will require 40 hour test period. Some certified engine/props combos have a restricted RPM range, which would be a safety concern. Herb

What is item 209b ??

Thanks

Jerry

GEEE! Thanks guys! I really appreciate the input. Sensenich has a 76AM-52 for an 0290-D2 which has round tips. Props with square tips are way more common. I'm doing to look into a 74DM 54 to 56 pitch and possibly have the tips rounded at a prop shop. Thanks Herb, I will first look into the options from McCauley. By the way, I have the wings, rudder, elevators covered and the fuselage will be done this week-end. The center section and horizontal stabs to go then on to stitching and tapes. Enjoying the fabric work a lot. Thanks for all the help.

Kevin Conner

Hi Kevin,
You have quite a few options. Most Sensenich props I think are square tips, of course for experimental you could have them rounded at a prop shop. I think McCauley made round some tips. Here is a list of metal props for O290's from McCauleys and Sensenich application guides that are online.
McCauley
Cessna 120 F O-290-D2 (LY) 1A175/GM8240 82.0
SA4-640
Russell
Conversions
PA-12
"Super Cruiser" O-290-D2 (LY) 1A175/GM8241 82.0 78.0 SA444AL
Zmuda 2400 2300
PA-18-125
"Super Cub" O-290-D (LY) 1A175/GM8241 1A175/GM8242 1A175/GM8244 82.0 SA02170AK
Dan's Acft Repair 36
PA-18A-125
"Super Cub" O-290-D (LY) 1A170/GM7448 1A170/GM7450 74.0 72.5 SA1-59
McCauley
PA-18AS-125
"Super Cub" O-290-D (LY) 1A170/GM7446 74.0 72.5 SA1-156
McCauley 2450 2375
PA-18AS-125
"Super Cub" O-290-D (LY) 1A175/GM8241 1A175/GM8242 1A175/GM8244 82.0 SA02170AK
Dan's Acft Repair 36
PA-20-125
"Pacer" O-290-D (LY) 1A170/GM7452 1A170/GM7454 74.0 72.5 SA1-89
McCauley 2300 2200
PA-20S-125
"Pacer" O-290-D (LY) 1A170/GM7450 74.0 72.5 SA1-157
McCauley 2425 2350
RAWDON T-1 O-290-C (LY) 1A170/DM7651 76.0 74.5 1 2220 212
7GC
"Sky Trac" O-290-D2B (LY) 1A170/GM7448 1A170/GM7450 1A170/GM7455 74.0 72.5 1 2500 2300

Sensenich
PA-18-O-290-D
With Lycoming O-290-D engine only (landplane, skiplane and seaplane)
(a) Propeller - fixed pitch metal
(1) Sensenich M76AM-2-50 +24 lb. (-57) MIGHT be ROUND TIP
or
*(2) Sensenich M74DM +30 lb. (-57)
Static r.p.m. at maximum permissible throttle setting:
Not over 2475 r.p.m., not under 2100 r.p.m. except when Item 209(b) is installed.
Not over 2450 r.p.m., not under 2325 r.p.m. when Item 209(b) is installed.
No additional tolerance permitted.
Diameter: Not over 74 in., no under 72.5 in.

Callair
A-2 O-290-A (LY) 1A170/LL7649 76.0 74.5 1 2350 2100
A-2 O-290-B (LY) 1A170/LL7649 76.0 74.5 1 2350 2100
A-2 O-290-C (LY) 1A170/LL7649 76.0 74.5 1 2350 2100

Good luck searching, I'll keep my eyes and ears open in my neighborhood. Herb

Kevin,
I'm using a Sensenich 74/56 on an 0-320 150 HP. I'm over pitched, I know, but I get better gas mileage that way. I turn 2200 at cruise and see 100 MPH (GPS). I'm kinda running in 5th gear. Climb is still good. Best pitch would be about 52" to 54", I'd think.

I'm using a Sensenich wood prop on my O-290-G (O-290-D)..... 74 X 54 and get about 90 mph @2350.... but I can't get to 2700 red line so I believe it's a little too much. I did have a wood 74 X 52 and got 85 @ 2350 and could get to 2700. I know these numbers are for wood and not metal but it gives you a starting point.
Sensenich has a website where you can get more info on their metal and wood props: http://www.sensenich.com/products/browse/14.

Hope this helps.

Jeff Moore

I would think Sensenich could tell you something. Their chart at Aircraft Spruce only shows one metal prop for an O-290.
It's 74-56 for standard and 74-54 for climb. It's for a PA-22 which has an empty weight pretty close to a CB-1.

Steve

Have decided to go with a metal prop on my Hatz. I don't know a thing about props but would like go with metal and round tips on an 0290-D2. Anyone have any ideas about a brand and model number? I called a prop shop but they need more information. I know there are many props that would work. I think I would like a standard prop, not a climb or cruise, something in between.