BE95 pilot reported an near midair collision on final approach at hsd.

Attributes
ACN	1308727
Time
Date	201511
Local Time Of Day	1201-1800
Place
Locale Reference	HSD.Airport
State Reference	OK
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	Travelair 95
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	None
Aircraft 2
Make Model Name	Amateur/Home Built/Experimental
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Person 1
Function	Single Pilot
Qualification	Flight Crew Commercial Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 600 Flight Crew Type 120
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 100 Vertical 100

Narrative:

On a 1.5-2 mile final; after flying a standard right pattern for 17; with radio calls announcing position; first from the west; then joining downwind; subsequent turning base; subsequently my final distance to land (twice) following a citation jet that had just landed and citation was clearing the runway at sundance airpark (hsd); I was cut off by [an] experimental aircraft. I was forced to do a late go around; after I had gear and flaps fully deployed.the plane that cut me off flew in from the east; and flew a non standard pattern with a left base (airport is right pattern for 17 so as to avoid the approaches to wiley post-pwa). The airplane had no position/navigation lights or landing lights on but it did bank hard and dive steeply so as to take advantage of a below standard pattern altitude and abuse the rule of lower airplane having right of way priority. Pilot was rude and abusive to the startled cutoff pilot and claimed he flew a standard pattern; which he did not as sectional and AFD clearly show. After landing (both landed safely) he offered no explanation.

Original NASA ASRS Text

Title: BE95 pilot reported an NMAC on final approach at HSD.

Narrative: On a 1.5-2 mile final; after flying a standard right pattern for 17; with radio calls announcing position; first from the west; then joining downwind; subsequent turning base; subsequently my final distance to land (twice) following a Citation jet that had just landed and Citation was clearing the runway at Sundance airpark (HSD); I was cut off by [an] Experimental aircraft. I was forced to do a late go around; after I had gear and flaps fully deployed.The plane that cut me off flew in from the east; and flew a non standard pattern with a left base (airport is RIGHT pattern for 17 so as to avoid the approaches to Wiley Post-PWA). The airplane had no position/navigation lights or landing lights on but it did bank hard and dive steeply so as to take advantage of a below standard pattern altitude and abuse the rule of lower airplane having right of way priority. Pilot was rude and abusive to the startled cutoff pilot and claimed he flew a standard pattern; which he did not as sectional and AFD clearly show. After landing (both landed safely) he offered no explanation.

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.