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Kevin Harberg

Mooney M-18 Performance

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Hello everyone,

Just wondering if  the gap seals (ailerons, flaps, horizontal stab, vertical stab) as well as other modifications that Denver Jacobson did on the build of C-GXTR (M-18X) was worth the effort. It appears to me that this Continental A-65 powered Mite is at least as quick as book (and climbs like crazy), even with the 1025lb gross weight licensed by Transport Canada in the homebuilt/experimental category. The attached photo shows 116-117mph IAS @2150RPM cruise at 3650'ASL (5-10MPH tailwind component as displayed on GPS). On occasion with short bursts of full power (15 seconds max), I get an IAS of 135mph and once had seen VNE in level flight. I have also attached a photo of GPS max ground speed in level flight (with a real strong tailwind, full rich, full throttle short duration). The reason for the post is to determine average cruise numbers of the light weight Lycoming powered M-18's compared to the heavier stock Continental powered M-18's (and to the highly modified M-18X, C-GXTR).

Blue Skys!

 

Kevin Harberg

 

04 Panel Left In Flight.jpg

GPS Max Speed.jpg

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Gap seals became a standard in production over the years...

Expect that they can work...

The faster the plane, the more value they have...

Great to see a Mite post!

Best regards,

-a-

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Kevin, I'm not familiar with that experimental version of the Mite, but I am curious that it seems to have neither the wig-wag gear indicator, nor gear lights.  What am I missing?

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On 3/20/2020 at 6:56 PM, Mooneymite said:

Kevin, I'm not familiar with that experimental version of the Mite, but I am curious that it seems to have neither the wig-wag gear indicator, nor gear lights.  What am I missing?

If you zoom in, you will see the big red light is labelled on its left as landing gear. The large size was chosen so as to be to be visible during the high ambient daylight conditions observed at noon through the canopy (greenhouse effect washes out smaller indicator lights placed higher up on the panel). The indicator light is actuated via "gear down" detent mounted micro switch interlocked (in series) with the throttle idle micro switch. The size reminds me of a stall warning light I have seen in other aircraft.

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Ahhhhhh.  Thank you.

I always thought the vacuum wig-wag was a clever idea, though it was apparently no more successful than other gear warning systems.  Lots of Mites landed gear up.

My Mite had the lights, but they were abysmally dim.  If I remembered to check the lights, it was because I had already remembered to lower the gear.  :lol:

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