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AS 350


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  • 4 weeks later...

I'd agree that autos aren't affected by "cheeks," but cruise flight is, somewhat. The aircraft aerodynamic trim stability is decreased and it will "hunt" in pitch and yaw. It's not marked and some guys never notice, but it's there.

If you carry bulky and or heavy gear and pax, it's a great addition to a fine aircraft.

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Wally - Are you talking about the Eurocopter Canada Cheeks or DART or American Eurocopter ? I've done the certification of the Eurocopter Canada's ones and never noticed yaw hunting. Static stability is slightly changed but nothing noticeable (slope of static stab unchanged). Do you have any other options installed on your aircraft ? maybe it's a combination of external mod...
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Don't recall brands- the squarish cheeks were the most pronounced hunters, the others (Photo above), less so. I'd flown the same aircraft for years, and years again with the cheeks, and other line aircraft, with and without. All with pop out floats.
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  • 1 month later...

Generally there is little change with one "cheek" or "pod" fitted other than losing a knot or so.

 

From advice from "somewhere in France" however, beware of possible "unusual" pitch behaviour at extreme C of G during steep or descending turns if you have cheeks/pods fitted to both sides.

 

The advice was that "under certain conditions" the nose had a tendency to want to tuck under.

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I think we have to be careful when we talk about the cargo pods. There are at least 3 different manufacturers that I know of in North America (Dart, American Eurocopter and Eurocopter Canada). They have different behaviour / effects on the aircraft and so when one says there is some "unusual behaviour" he should mention the exact type of pods. I know for a fact that when we performed the flight test on the Astar with the Eurocopter Canada pods we did not notice any yaw and / or pitch hunting. However if anyone has data to substantiate the fact, I'd really like to take a look.
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helped dart develop there 350 pods, then was employed at ecl, can verify that the overall shape of the dart pods and ecl squirrel cheeks are basically the same. the mfg technique's are much different, wet layup vs autoclave. was present for flight test on dart pods, and do not recall any unusual flight characteristics. the aec pods are very square in shape and have a small verticle scoop at the aft end of the pod, which leads me to believe this was installed to overcome some sort of handling anamoly.

dr

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