Msg ID:
2724093 |
CG Effect on Range / Airspeed +0/-2
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Author: Econ Eddie
3/24/2022 10:43:35 PM
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In airplanes, loading to most rearward CG increases range.
So: Does CG location in a conventional helicopter design (main rotor / tail rotor configuration) have an effect on fuel economy / range / airspeed? If so, what gives max range: most forward CG, mid-range CG, or most rearward CG? State your reasoning or cite your reference please.
Thanks. |
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Msg ID:
2724095 |
CG Effect on Range / Airspeed +3/-2
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Author:Stability Concerns Around Design
3/25/2022 12:27:45 AM
Reply to: 2724093
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And engineering of fixed wing aircraft in the longitudinal axis, favor a downforce supplied by the elevator. That downforce, if removed(or lessened as in slow flight or MCA), allows the nose to pitch down during stall. In a rotor wing aircraft, downforce on an elevator keeps the longitudinal axis of the airframe from paralleling the main rotor. It is more for minimizing drag. |
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Msg ID:
2724111 |
CG Effect on Range / Airspeed +1/-3
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Author:That’s a nice answer
3/25/2022 7:03:24 AM
Reply to: 2724095
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It may even contain some true information but it doesn't even come close to answering the question. |
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Msg ID:
2724178 |
CG Effect on Range / Airspeed +0/-0
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Author:Thanks For Criticizing (Incorrectly)
3/25/2022 3:13:25 PM
Reply to: 2724111
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While not coming close to answering the question. |
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Msg ID:
2724194 |
CG Effect on Range / Airspeed +0/-0
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Author:say wut
3/25/2022 4:43:17 PM
Reply to: 2724178
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q: what's the best cg for range?
a: the thing in the back pushes the nose up...the longitudinal axis... parelling the helicopter... minimize drag
me: okay lol thanks got it
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Msg ID:
2724221 |
CG Effect on Range / Airspeed +0/-0
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Author:CG Doesn’t Tell The Whole Story
3/25/2022 6:50:02 PM
Reply to: 2724194
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CP has just as much or more to do with optimum range. Max range in a helicopter comes from the longitudinal axis being most in line with relative wind to minimize drag. |
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Msg ID:
2724303 |
CG Effect on Range / Airspeed +1/-0
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Author:Flat
3/26/2022 4:42:20 PM
Reply to: 2724095
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plate drag is the operative term to express what is being minimized by the action of the horizontal elevator to optimize forward movement, aka airspeed. |
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Msg ID:
2724419 |
CG Effect on Range / Airspeed +1/-0
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Author:Some one
3/27/2022 7:36:16 PM
Reply to: 2724303
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knows what they're talking about. |
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Msg ID:
2724495 |
OK, so relate this to Aircraft CG +0/-0
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Author:Econ Eddie
3/28/2022 11:05:02 PM
Reply to: 2724303
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So if we want to minimize Plate Drag then will loading the aircraft to a forward CG, and aft CG, or a middle CG do this minimization, thus saving fuel, which is the goal--? And, what is the reason this is so? Thanks. |
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Msg ID:
2724497 |
OK, so relate this to Aircraft CG +0/-1
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Author:It’s irrelevant
3/28/2022 11:24:26 PM
Reply to: 2724495
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you aren't going to seat people in a helicopter differently just to try to save a couple drops of fuel. Most trips are so short, any savings would be insignificant. It's just not the place to look to save fuel. You load the helicopter to stay within cg limits. Very few variables beyond that. End of story. |
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Msg ID:
2724548 |
What You Mean Is +0/-0
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Author:Econ Eddie
3/29/2022 2:40:28 PM
Reply to: 2724497
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that you don't know or don't care. I do and I want an answer. The question still stands. |
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Msg ID:
2724586 |
What You Mean Is +0/-0
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Author:It’s a stupid question
3/29/2022 11:49:23 PM
Reply to: 2724548
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with no practical application. A complete waste of energy. Ask until youre blue in the face. It's about the same a arranging passengers in a car for better gas mileage. |
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Msg ID:
2724587 |
Until you +0/-0
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Author:Econ Eddie
3/29/2022 11:55:04 PM
Reply to: 2724586
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can cite data and references, all you are saying is you don't know, or at best your opinion. I want facts backed up by references anr flight test data. The question stands. |
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Msg ID:
2724588 |
Until you +0/-0
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Author:There will not be any data
3/30/2022 12:20:09 AM
Reply to: 2724587
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there will be no references because its something that has no practical application. Nobody has studied this and nobody is going to study this. You need to accept that. Go ask on pprune. Those guys love to get wrapped around the axle with stupid sh*t but I doubt anybody would even bother. |
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Msg ID:
2724984 |
What You Mean Is +0/-0
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Author:As I said
4/3/2022 11:57:46 AM
Reply to: 2724586
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you got no answers on prune because it's a stupid question. those people just want to hear themselves talk anyway. |
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Msg ID:
2724200 |
CG Effect on Range / Airspeed +0/-1
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Author:olderendirt
3/25/2022 5:06:20 PM
Reply to: 2724093
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cg at aft linit does sme thhing for helicopters. |
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Msg ID:
2724485 |
CG Effect on Range / Airspeed +1/-0
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Author:Yeah
3/28/2022 8:26:24 PM
Reply to: 2724200
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ur on the edge of running out of cyclic control. If you've never been there trust you don't want to! Flew for an operator who reconfigured a BH47 and forgot to replace the aft ballast on reconfiguration thus some subsequent pilots ran out of aft cyclic occasionally. DO said everyone was full of it, until on a demo flight displaying the merits of the BH47 vs the H300C he crashed on landing with the 'clients' on board.
Thus another adventure of the most inept DO in the historic annals (anals?) of east coast helicopter operator epics. |
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Msg ID:
2724201 |
CG Effect on Range / Airspeed +3/-0
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Author:answer
3/25/2022 5:08:29 PM
Reply to: 2724093
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I always put everyone in the baggage compartment. it doesn't do anything for range but makes for a peaceful ride. |
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