Hump and Bump (oz9092)

About this Plan

Hump & Bump. Radio control sport trainer model(s). This is a two-for-one plan that shows two fuselage designs (Hump and Bump) that both use the same wing parts.

Quote: "Hump - a .15 powered transitional 'trainer' that turned out to be something more, and Bump - a high-winged version of the Hump that is capable of all but sustained vertical maneuvers

The Hump and the Bump are fine fliers and have served me well over the past year. Both have literally had their wings and tails flown off, with only one crash and that was with the original Hump which succumbed to pilot error during landing. The second Hump (shown in the photos) has been retired twice, but brought back to active duty both times for something to fly.

The Hump was the original of the two. It was intended to be a transitional trainer from a Lanier Cessna with which I had been learning to fly. However, in bridging the gap I guess I left out a span because it proved a bit more than I could handle at the time. Though stable, it was just a little too responsive for my ill-trained reflexes.

But I liked the basic size and plunform so, rather than drop my idea, I took a more conventional approach to a trainer and put the wing on top. The Bump (it rhymes) was born.

This filled the gap and I began to find out what R/C multi was like. She proved capable of all but sustained vertical maneuvers and showed no bad habits. Since the wing loading was a little high the landings were a bit faster than I was used to, and this proved to be my undoing with the Hump later on. Don't get me wrong, the higher sink speed wasn't bad, it was just higher than the Cessna. In fact, I feel it is .an advantage over a 'floater' and, once I mastered my sink rate, my landings improved.

The Bump finally wore out so I built another Hump (to replace the original) to really prove whether it was a worthwhile design. I found it actually performed very much like the Bump, but, as stated before, was somewhat more responsive. Of the two airplanes the Bump is probably the better overall flier, but I actually prefer the Hump because of its responsiveness and appearance..."

Update 21/08/2017: Added PDFvector plan tracing, thanks to hogal.

Supplementary file notes

Article pages, thanks to hlsat, JHatton.
PDFvector plan tracing

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