Hummel Aircraft - Here is an Ultracruiser completed by Steve Grensky and a build partner in Grants Pass, OR, that uses a Hirth F23 engine. Sounds like it was finished around October
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Kathryn's Report: Hummel H5, N144HV: San Luis Obispo County, California
Hummel H5 - Wikipedia
HUMMEL CA-2 PART103 ULTRALIGHT – PLANS AND INFORMATION SET FOR HOMEBUILD AIRCRAFT – VERY SIMPLE AND CHEAP FULL METAL ULTRALIGHT | https://buildandfly.shop
Hummel Aviation, Hummel Bird, Hummel H5 and UltraCruiser all metal ultralight, experimental aircraft - YouTube
Hummel Aviation Bird Airplane Wood Model Free Shipping | eBay
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2011 / Hummel Aircraft Kit / UltraCruiser Fuselage of an experimental homebuilt plane called the “Hummel UltraCruiser”. Lettering from Steven W, VA - CustomVinylLettering.net
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OK-IUS02 - Private Hummel Bird at Zábřeh | Photo ID 970514 | Airplane -Pictures.net
HUMMEL ULTRACRUISER - PLANS AND INFORMATION PACK FOR HOMEBUILD WV ONE SEAT SIMPLE & CHEAP BUILD FULL METAL PART103 ULTRALIGHT | https://buildandfly.shop