Tech Questions from current Buyer of 337

[Centered Power]

Been Following Soapa for years - finally now looking to buy. Lots of reading already on SOAPA and manuals I have acquired: 1977 337G POH
1977 T337G POH
1971 337F POH
1969 337D POH
1969 T337D POH
1964 336 POH

Question 1: Both the 1977 POH show Gear Operating / Gear extended speed limit of 140 KIAS. I assume this is the same for 1973 - 1980 ?
The 1971 337F (last older fuselage style ) shows a Gear extension speed of 160 mph Indicated. This converts almost exactly to the 140 KIAS of later models.
HOWEVER -- The 1969 POH as well as comments in the one previous thread on the subject show a gear extended speed of 140 mph Indicated. I wonder if someone has a definitive answer for whether the difference between 140mph in 1969 and 160mph in 1971 represents a REAL change in physical structure, parts etc. ??? Also what is the number in a 1970 337E POH which I don't have ??

I note that sometimes aircraft manufacturers recalculated, weights speeds etc because of market pressure-- getting closer or right onto limits provided or implied in FAA Regs ---What is going on with this difference. ( It has some implications in my search and choice of aircraft to acquire.)


Question 2: This question regards the Robertson STOL--- I am aware that in single engine aircraft with the Robertson STOL that in order to achieve the Take OFF and Approach and Landing performance actually claimed, that one must fly the aircraft at VERY High Nose / Deck Angles ---The figures can be achieved in reality and the nose up in Take Off is extreme and just quite a bit higher than factory in Approach and Landing. SO the QUESTION is whether or not the Robertson requires the same technique in the 337 ? I am especially interested in the Approach and Landing and using both (each of ) the "Robertson Normal" and " Robertson STOL" technique.

These terms, Roberson Normal and Robertson STOL are on a Robertson publication I have in my possession --a 1 Page table which is info / numbers only for 337 models from 337A through 337G and T337G --- There is no date on this publication --But it is so old that Robertson was still operating at Renton rather than Everett where I first visited their Hangar in the early 1980's. (Obviously before Robertson death and sale to Sierra Industries.) --This Page about 337 performance says NOthing about Deck Angle / Pitch.

Thanks everyone for the help.