Pics are worth a thousand words! I've got a pic somewhere of the H5 that I saw with a welded mount. If I find them, I'll post, but the engine box design on the H5 is very easy to fabricate.The Hummel H5 and the UC both Bed mount I believe. I attached th eH5 pictures I got from the factory.
Well ****, I've only seen conventional mount H5s, and bed mounts on the Ultracruiser, guess I just assumed the H5 plans were like the Hummelbird I'm building.Well, my H5 plan set from 2008, on sheet 2 clearly details the engine box (bed mount) for the full size VW engine. Another well known Hummel builder who's local to me, did use a welded mount, but the built in bed mount is clearly what Hummel has in mind for the H5.
Generally I agree with you completely. I started the thread because I’m very slowly thinking my way through how I would build a maybe-UL-but-probably-LSA replica Buhl Pup and the original airplane’s fuselage was just one big tin can from engine mount to fin post. I still think there are definitely ways to do it, it just sounds like ai won’t get the benefit of copying someone else’s homework.I don't think a sheet metal monoque mount would be as good an option as a tube steel or cradle mount.
Dennis is a great resource for all things Hummel. But, so is Terry, and whoever took over the operation recently. I'm not sure your assessment is accurate. While the engine attaches directly to the angle pieces, I think a significant amount of the load bearing capacity is in the skins and doublers. I'd check this point directly with the folks at Hummel if I were you. You could prove the point to yourself by mounting the angles to the firewall and then mounting the engine, leaving the skins and doublers off completely in the engine area and see what happens. The number of rivets is the first clue. You don't need anywhere near that many to attach skins unless they are considered structural. Have you started a build thread yet? I'd be very interested, since I'm working on an H5 build myself. Take care!the engine mounts to the main angle attached to the firewall. the engine does not mount to the sheet metal. the t6 angle carries the load of the engine. Of the four angles, two act as side rails and run level from the firewall back past bulkhead C (where the pilot sits) up to D I believe. the two engine mounts on the bottom use two t6 angle that extends from the firewall back to the T.E. of the wing under the pilot's rear... As a scratch-built, I have the option to mount my engine any way I want. I will be doing it as Dennis Brooks has and that is with a 4130 tube frame attached as it is shown on the plans I own.