And 182s are nose heavy, especially on amphibs.
A story about opening up the angle between floats and airframe: After an incident, I needed a replacement airplane. I was told the Aircraft Division would have a 185 rigged on floats for me in a day or two.
Years before, they acquired military surplus EDO 3430 straight floats that were rigged for Cessna 195s. These floats were all brand new, never used by the military. 3430s are a very nice 185 float for working, but 195 rigging?
These mechanics had done some careful measuring years before, and found the 195 rigging had longer spreader bars, so floats were wider….not a bad thing, but rear struts were too long for 185. So, cut off the rear struts, and voila….185 floats.
Well, apparently, somewhere along the line, either someone forgot to write that number down, or the paperwork was lost. So, in this case, somebody decided to work from memory. We all know how that works.
I arrive in ANC to pick up my new ride, and just looking at the plane sitting on floats on the water, it seemed pretty nose high. But, it’d been a while since I flew a 185 on EDOs, so, whatever. I completed a careful pre flight, and taxied out to conduct a maintenance test flight.
A normal takeoff and initial climb, but as I start the accel to climb speed the thing starts vibrating like a a dog sh#$ting peach pits. Power to idle, and land. Hood Tower asks what’s going on, and now I’m the one shaking. I taxi back to parking and explain to Maintenance there’s something wrong with the plane.
There had been a recent management change there, so a meeting was convened……with one of their pilots volunteered to do a “proper” flight test….. Like an idiot, I go along for the ride.
We take off, the thing is shaking hard, and the Gypsy in the left seat is just sitting there. He says “This doesn’t seem too bad”. Incredulous, I asked him what our airspeed was. Him “Damn, I can’t read the instrument, it’s shaking so bad it’s a blur….”. And, now, we’re over the Inlet, northbound. Return to Hood, land, park, and my pilot is shaking as bad as the plane. And I’m really questioning my judgement.
Told Maintenance to figure it out and call me when it’s done.
turns out they’d cut the rear vertical struts off a wee bit more than specified in the paperwork they suddenly found. Only thing we could figure was that what we were feeling were power pulses off that big 88 inch two bladed prop hitting the tails of the float decks.
A “common” bootleg improvement these guys did on at least some of our 180s rigged on 2870 EDOs was to drill one more hole in aft struts and cut off the top of those struts, increasing the angle between the floats and plane. The “proper” cutoff for the 195 float rigging of our 185s did the same thing. In this case, they’d just taken it further…with weird but scary results.
MTV