GSC Propellor

[Dusty]

I don't have the pitch settings for my gsc but my airplast prop on a 3:1 gearbox
17.5degree at the tip=5200static (prop stalling?)

15.5 degree =5800static


14.5degree=6000static
I run slightly over pitched and the airplast is marginally smaller giving a better cruise at the expense of a little less initial acceleration.
Possibly try14degree initially and adjust from there(1degree is around 200rpm)
Don't rely on the original tachometer ,use a tiny tach or similar .
Pitch change is no big deal using the clamp on protracter.
Make a wooden tool that slides over the prop blades to get better leverage
(Like a crescent spanner with an airfoil cutout)this makes accurate movement easier
Don't attempt to fly under pitched as your egt's will go ballistic! If they are high on test flight, just pull them back using a little choke to get you back to base!

[dholly]

My KF3 had a 582 mod 99 w/ 2.62:1 C-box and 68" GSC Tech III prop. Best set to 13.5* to 14* degrees, IIRC.

[jonstark]

GSC talks about a fixture to slide up the prop blade to give the correct blade station for angle measurements. How far from the hub or tip do you folks measure the blade angle without this tool?

Jon

[t j]

The 21 year old instructions I have for a GSC 3 blade prop say to place the protractor at 75 per cent of the distance from the hub center to the tip of the blade. Mine was a 68 inch prop so I set the protractor at 25.5 inches from center of the hub.

[Olle1975]

582 Mod. 90 Greyhead with 68" GSC and C-Box (I think 3:1) with GSC-Tool at 75% 18 Degree Pitch. Round about 5800 rpm static.

Olaf

[Monocock]

I've recently replaced my 66 inch GSC three blade on my 582 for an IVO.

The figures speak for themselves;

GSC
Static 6200
Climb 700 fpm
Cruise (5200 rpm) 68 mph.

IVO
Static 6200
Climb 900 fpm
Cruise (5200 rpm) 83 mph.

Mk 3 with C box. All figures quoted above are solo.

[Dusty]

The GSC numbers are very similar to what I was getting
The IVO numbers are impressive,that's 72 kts! At 5200.
I need 5700 to get that with my draggy 3.
New tech v's old school perhaps?