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Hughes 269/Schweizer 300 series

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Hughes 269/Schweizer 300 series

Old 12th Jan 2006, 09:30
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Re: Schweizer 300C W/B Envelope

Another question for your CFI. If you set 2300rpm at flat pitch, why when you pull the lever up to 18inches is the erpm at 3000 rpm and you dont need to touch the throttle for the next 95% of your flying ?
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Old 12th Jan 2006, 19:01
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Re: Schweizer 300C W/B Envelope

Kissme quick if gyroscopic precession doesn't happen how do you accont for flapback ?
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Old 12th Jan 2006, 19:26
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Re: Schweizer 300C W/B Envelope

Phase lag perhaps...?
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Old 13th Jan 2006, 00:05
  #104 (permalink)  
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Re: Schweizer 300C W/B Envelope

Hang on, we are getting of the topic here.
How attractive is she?
Hughesy
 
Old 13th Jan 2006, 00:13
  #105 (permalink)  

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Re: Schweizer 300C W/B Envelope

....er... not as attractive as me!

Cheers

Whirls
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Old 13th Jan 2006, 02:10
  #106 (permalink)  
 
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Re: Schweizer 300C W/B Envelope

Originally Posted by Whirlygig
How many fuel tanks does it have?

Cheers

Whirls


....also female and incredibly stunning!!!
Two

Ask her...
why the tail rotor blades angle forward from the hub?
Why are there two pressure switches on the MR gearbox?
What is the function of the slat?
Will it fly at 320 RRPM?
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Old 13th Jan 2006, 12:09
  #107 (permalink)  
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Re: Schweizer 300C W/B Envelope

>why the tail rotor blades angle forward from the hub?

** you mean the 30 degree offset? thats to reduce the flapping amplitude

>Why are there two pressure switches on the MR gearbox?

*** one for the hobbs, one for the warning light?

>What is the function of the slat?

*** stability during autorotation. stops the nose dropping

Last edited by thecontroller; 13th Jan 2006 at 14:26.
 
Old 13th Jan 2006, 12:18
  #108 (permalink)  

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Re: Schweizer 300C W/B Envelope

Fling, are you refering to this particular aircraft in the original question 'cos some Schweizers only have one tank! I was being a tad facetious!

Off the top of my head (and I'm at work at the moment so don't have the numbers handy) isn't 320 RRPM a bit low for the Schweizer. 3,200 is top of the engine RPM band isn't it?

Cheers

Whirls
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Old 13th Jan 2006, 13:44
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Re: Schweizer 300C W/B Envelope

Call me stupid but isn't RRPM "rotor revolutions per minute", and if so, if that thing was swinging around at 3200 rpm, wouldn't that make the tip speed around 19,000 mph?
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Old 13th Jan 2006, 14:29
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Re: Schweizer 300C W/B Envelope

Originally Posted by thecontroller
>why the tail rotor blades angle forward from the hub?
** you mean the 30 degree offset? thats to reduce the flapping amplitude
Not the delta hinge, the fact that the blade angles forward from root to tip when viewed side-on.
>Why are there two pressure switches on the MR gearbox?
*** one for the hobbs, one for the warning light?
Starter interlock - keeps the starter from operating if the rotor isn't turning and the clutch is engaged. If there is pressure in the MRGB, the starter will operate no matter what.
>What is the function of the slat?
*** stability during autorotation. stops the nose dropping
Yep, but how?
>Will it fly at 320 RRPM?
*** 320?! you mean 3200??
320 rotor RPM (green range is 390 - 504, power on is 442 - 471). BTW, that pic is from a CB or CBi, note the 2530 - 2700 ERPM range.
Whirls, 300C models will have two tanks to go along with the left-hand PIC - let's put it this way, I've never seen one with only one tank. The CBs and CBis often only have one tank as suits their training role and RH PIC setup. You can option LH PIC and dual tanks on a CBi, but at 1750 lb MGW you will not often be able to put more than 35 gal into the tanks with two people, so it's of limited utility. The 300C has 200 or 300 lbs more useful load (depending on when it was built), so it can usually go full fuel (up to 64 gal).
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Old 13th Jan 2006, 14:31
  #111 (permalink)  

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Re: Schweizer 300C W/B Envelope

Thanks Dave, I said "engine" in response to a now-edited post (a few above) which commented on the "320 RRPM" as stated by FL207 suggesting that it should have been 3200 RRPM. That was what generated the comments from myself and highfinal.

Is the picture of your Schweizer a CB or CBi? 'Cos I'm sure my ideal operating ERPM is 3,100 making 3,200 the top end on a 300C.

Cheers

Whirls
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Old 13th Jan 2006, 15:21
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Re: Schweizer 300C W/B Envelope

ATPBMA

Back to the subject
I was getting excited at the thought of a picture from Dave Smith, but to find it is a tacho and a cbi one at that ! When are we going to see what your CFI looks like so we can have a more interesting discussion ?
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Old 13th Jan 2006, 16:07
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Re: Schweizer 300C W/B Envelope

so don't keep us all edgy - send a picture of the lady and if Whirlygig so desires to send in one as well, all the better.
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Old 13th Jan 2006, 16:16
  #114 (permalink)  
 
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Re: Schweizer 300C W/B Envelope

The W/B envelope is a graphical explanation of the amount of cyclic/lever control available throughout the permitted weight range. As a safety device. Fly your helicopter out of this area and you will not have full control available. The corner is not missing, it was never there. Consider weight, manoeuvring 'G' and autorotations all require full control availability.
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Old 13th Jan 2006, 17:51
  #115 (permalink)  
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Re: Schweizer 300C W/B Envelope

CFIs ask some daft questions don't they?

Yeah, I think a picture of the instructor would help everybody
 
Old 14th Jan 2006, 02:13
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Re: Schweizer 300C W/B Envelope

Originally Posted by ATPMBA
My new CFI (female and attractive) has challenged me with a question as I am going for my CFI. I need to know why the weight and balance envelope is missing a triangular piece on the lower right hand corner.
...so back to the original topic (and I admit the hottest CFI's fly Schweizer), what about the clipped corners on the CG envelope?
OK I'll take one for the team (in a semi-drunken, whoops did I say that, condition), I'm not sure! The CG of the Schweizer is primarily derived from the limits of control movement and the flapping limits of the rotor. The clipped corners are right-aft and left-forward. Fuel tanks and PIC position are immaterial to the CG envelope (they only affect the position of the CG within the envelope).
So I can't see the reason. There's no problem moving the cyclic forward-left and aft-right (in fact it's the aft-left position that's the biggest problem if you have a left-PIC or the dual controls in). This is really going to vex me until I know the answer...
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Old 14th Jan 2006, 02:40
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Re: Schweizer 300C W/B Envelope

Originally Posted by Flingwing207
Whirls, 300C models will have two tanks to go along with the left-hand PIC - let's put it this way, I've never seen one with only one tank.
Got one, seen a bunch. Right tank, left PIC.
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Old 14th Jan 2006, 11:47
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Re: Schweizer 300C W/B Envelope

Correct me if I'm wrong but I believe the standard 300C's have a right hand side fuel tank and left hand side PIC. The left hand side tank is optional. The 300CB has a left hand side tank and right hand side PIC.
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Old 14th Jan 2006, 12:08
  #119 (permalink)  

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Re: Schweizer 300C W/B Envelope

Thanks guys,

For a minute I thought Flingwing was trying to do a "Fanny By Gaslight" on me as I could have sworn that I had flown a 300C, LH PIC that only had one tank (on the right!). But with old age and senility creeping up ever more on me, I couldn't be sure that I wasn't going bonkers!

Cheers

Whirls
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Old 15th Jan 2006, 00:10
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Re: Schweizer 300C W/B Envelope

Originally Posted by Whirlygig
For a minute I thought Flingwing was trying to do a "Fanny By Gaslight" on me as I could have sworn that I had flown a 300C, LH PIC that only had one tank (on the right!).
Cheers
Whirls
Never on purpose, Whirls! Must be that old UK/USA thing, or the fact that I've seen all of, lessee, one, two, three, four, five, SIX, 300C's (1977 to 2005 vintage) up close and personal - all had dual tanks and LH PIC. So chalk it up to my youth and inexperience...
Anyway, hopefully I'm more Harry Somerford than Lord Manderstoke
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