Engine Alignment

[lelievre12]

Does anyone have any drawings or data related to the engine alignment / thrust line for the Cozy IV?  Either Cont or Lyc.  I am setting this up in CAD and have no idea of the 'standard prop hub location. 

[lelievre12]

Actually I think I found the data online.

http://www.canardaviation.com/cozy/chap23b.htm

Discusses;

1. Plan View: prop flange square to centerline at BL O" (no P factor correction) and ;

2. Elevation: prop flange center at WL 21.5" (1.5" below top of longerons) with a 2 degree downthrust (aft higher than for'd). 

3. Prop flange station = 41-42" aft of firewall. 

Does that sound right to others?

Edited November 4, 2020 by lelievre12

[Marc Zeitlin]

1 hour ago, lelievre12 said:

1. Plan View: prop flange square to centerline at BL O" (no P factor correction) and ;

2. Elevation: prop flange center at WL 21.5" (1.5" below top of longerons) with a 2 degree downthrust (aft higher than for'd). 

3. Prop flange station = 41-42" aft of firewall. 

Does that sound right to others?

(1) and (2), yes. Since the longeron incidence angle will be about 1.5 - 2.5 degrees (nose up) in cruise, that puts the thrust line just about level in cruise.

(3) is approximately correct, but will depend on what engine you're using and who you bought your engine mount from (or how you fabricated it).