zsmith3rd(at)earthlink.ne
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 Posted: Thu Dec 10, 2009 8:19 am Post subject: Various Engines |
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do not archive
No experience with any engine except 912 on 701.
However, different engine weights usually cause changes in CG, or at least enough concern about the CG to re-calculate it.
Example is the placement of the battery behind the seat in a 701 with 912 engine to accomodate the added weight forward of the firewall.
Note that the typical ag plane which has been converted to turbo-prop has the engine moved forward to maintain the previous CG, specs, etc. A PT6 is a bit lighter than the R-985 or R-1340.
Same applies to the 701, if we use a "lighter" engine than the original design.
Problems arise when the engine is HEAVIER than the aircraft design allows.
We might move the firewall aft, move the wing forward, lengthen the tail cone, etc, but why bother......the design is what it is.....it is a 701.
If we add a generous amount of power (above the "design" value) we get into "prop clearance" discussions and some beefing-up of the firewall to handle the torque & weight.
The IO-540 may not be a good choice.
A 701 is a 701......accept it for what it is. Several engines are "suitable", pick one.
Personally, I'd venture that the 912 engine in the 80 or 100 HP version is about maximum for this airframe. Others likely will heatedly disagree, but my point is this: Want more speed & power, get a a different airplane......the 701 specs are what they are.....nice paint and a glass panel won't change the specs.
If you need STOL-to-the-max get a helicopter, a blimp or a UFO.
With kindest regards and a politically-correct MERRY CHRISTMAS to all,
Zed/701/912/90%/etc/etc/....
Let the flames begin!
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