Experimental aircraft pilot reported an uneventful forced landing due to prop assembly failure.

Attributes
ACN	1749694
Time
Date	202007
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Amateur/Home Built/Experimental
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Propeller Assembly
Person 1
Function	Single Pilot
Qualification	Flight Crew Flight Engineer Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 3 Flight Crew Total 7651 Flight Crew Type 91
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

I completed 3 touch and go at ZZZ. I had turned out to the northeast climbing through 1;500 feet and heading about 059 degrees when I noticed a vibration. I turned slowly back toward the field (about 239 degrees) and tried to isolate the vibration by slowly retarding the throttle. During this time I heard a bang and my windshield was covered in oil (I was not able to see through the windshield). I immediately shut both ignition switches off and turned master electrical and boost pump off. I then proceeded to slide the canopy open to see out. After I got the canopy open I saw ZZZ and got the aircraft trimmed and set at best rate of descent from 85 mph to 65 mph and preceded to ZZZ. I had to do s-turns to get down to safe altitude for final and landing at ZZZ. After roll out and post inspection revealed the spinner/prop/flange missing. On further investigation; revealed the crankshaft sheared.

Original NASA ASRS Text

Title: Experimental aircraft pilot reported an uneventful forced landing due to Prop Assembly failure.

Narrative: I completed 3 touch and go at ZZZ. I had turned out to the NE climbing through 1;500 feet and heading about 059 degrees when I noticed a vibration. I turned slowly back toward the field (about 239 degrees) and tried to isolate the vibration by slowly retarding the throttle. During this time I heard a bang and my windshield was covered in oil (I was not able to see through the windshield). I immediately shut both ignition switches off and turned master electrical and boost pump off. I then proceeded to slide the canopy open to see out. After I got the canopy open I saw ZZZ and got the aircraft trimmed and set at best rate of descent from 85 mph to 65 mph and preceded to ZZZ. I had to do s-turns to get down to safe altitude for final and landing at ZZZ. After roll out and post inspection revealed the Spinner/Prop/Flange missing. On further investigation; revealed the crankshaft sheared.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.