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  1. B

    Becoming a homebuilt designer and builder.

    Bienvenido! And congratulations on completing your degree. What type of ’cheap-ish’ 50hp engine do you have in mind for you build? What other design constraints do you have? (MTOW under 300kg?)
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    Pushers...way to go ?

    Agreed - for a conventional layout aircraft. For a canard layout, the extra weight is forward of the main wing, so a rear engine acts as a counter-balance of sorts, and the ‘crew’ can be placed closer to the CG. But still… a Part 103 ultralight version of a Heron UAV would just be so cool. I...
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    Briggs & Stratton Vanguard 23hp build

    EGT and O2 sensors are 'down the road' additions, if and when I get to more serious fine-tuning of the engine. The CHT and oil temp are mostly to keep me from cooking the engine during testing. As for the fan shroud, I won't be able to use it at all with the Eiffel clubs. The club runs will...
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    Briggs & Stratton Vanguard 23hp build

    I got the engine bolted to the 'motor table' for the test stand. (I re-attached the fan, to give the engine some kind load during break-in.) I installed the gauges, but still have to wire everything up. The CHT leads fit the spark plugs perfectly. The oil pressure sender will mount off of...
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    Briggs & Stratton Vanguard 23hp build

    Thanks for the video. Nice little plane, and it looks like our fellow flyers were having a good day.
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    Briggs & Stratton Vanguard 23hp build

    I have a piece of 2" x 5"OD aluminum round stock that I'm going to machine to fit the stock flywheel. (center over the flywheel nut, bolt on with 4 M8 bolts) All the Eiffel clubs will be plain squares, no hub, but will have a center dowel hole for aligning on the aluminum hub. Then I'll have...
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    Briggs & Stratton Vanguard 23hp build

    So anyway... I did a little woodworking today and got a good start on the test stand. (Kudos again to Leonard M.) Built with scrap pallets from work and a few wood scraps from the garage. I think the most expensive part of this was the deck screws! I need to make a run to the hardware...
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    Briggs & Stratton Vanguard 23hp build

    No, not yet. I’m not dismantling the engine until I’ve done the base line testing. I’m sure the camshaft and oil pump will match up, but not so sure about the rear seal. If it works, great. If not, oh well - I’m having fun.
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    Briggs & Stratton Vanguard 23hp build

    Thanks for the previous tip on "drill the big holes first". I bought a carbide cutter at HF and got some flanges cut. The cutter died on the sixth and final hole. (304 SS plate) The 2-hole flanges are for mounting to the exhaust port. The 3-hole flanges are for making a flexible...
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    Briggs & Stratton Vanguard 23hp build

    I was actually thinking of using a Harley alternator. Coils are fixed and magnets are mounted in a steel ‘cup’ - which would bolt to the back of the (flywheel-less) aluminum prop mount.
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    Briggs & Stratton Vanguard 23hp build

    It is too heavy and must therefore die - on a powerful lathe! I will scatter it‘s weighty chips over an EPA-approved recycling center. 🍻
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    Briggs & Stratton Vanguard 23hp build

    Montana, Hey, no worries. This opened up a good discussion. I've been busy (work, family, aging parents, etc.), so this gave me the kick to get back out in the garage. When I was taking the stock blower fan off of the engine, I was certainly thinking about how to cool the engine without...
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    Briggs & Stratton Vanguard 23hp build

    It can still be useful info. (comparing props or fine-tuning an adjustable prop). Besides, I need to get all the before and after weights on the engine.
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    Briggs & Stratton Vanguard 23hp build

    So I’ve been looking at options for a test stand and I think I’ll go with a wooden test stand, ala Leonard Milholland. Just trying to figure out how to make a ’folding’ version. (I don’t have a big roomy hangar like he does.) I ordered oil temp and oil pressure gauges, a tach, and a dual CHT...
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    DA11?

    Yes, I remember seeing that, too. It was much larger and definitely not 30hp. DA-11-2 N-number is N112DA Deregistered here: Aircraft Inquiry (you might need to re-enter the number)
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    Briggs & Stratton Vanguard 23hp build

    I’m guessing the pilot is a bit more than 6’ tall, and the prop is around 48”. Watch when he is pulling the prop through. (compare to his height, and to the size of the engine) It looks to be the same size as the one on the SD-1 in the hangar. But I don’t think 1.1m. It doesn’t sound like he...
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    Briggs & Stratton Vanguard 23hp build

    Thanks for the video! Can‘t see much detail on the flywheel, but the prop hub extension is needed to clear the intake. As I was taking the stock intake off, that (Spacek) is the style of intake I imagined would be needed. (180 u-bend with carbs between the cylinders) When he is putting the...
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    Briggs & Stratton Vanguard 23hp build

    But with the Mini-Bronco, I could scan for ground targets. 😉 Anyway, good weather this weekend, so I hope to make more progress on the engine.
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    Briggs & Stratton Vanguard 23hp build

    Got the engine stripped down. Now to rebuild for testing. Should be able to get some improvements on the intake - the stock intake has 4 90-degree bends. I was at the WPAFB museum a few weeks ago and found the perfect project. Seeing as how the ULTRA UAV has shown that 2 of these engines can...
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    Leonard Millholland is about ready to release Briggs conversion plans

    Another nugget. Is the 49-series rod the same size as the 38? (journal sizes and c-c length) Is it forged steel or forged aluminum? The 810 literature mentions the forged rods, but the 627 does not.
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