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pj.ladd(at)btinternet.com
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cristalclear13
Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia
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 Posted: Mon Jul 07, 2008 9:20 am Post subject: Re: Gyrocopter intercept |
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| pj.ladd(at)btinternet.com wrote: | Hi Cristal, What state are you in?>>
Ecstatic I should think !
Pat  |
Pat, You beat me to it. 
Ed, I'm in SE GA (it shows on forum website). Why do you ask?
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_________________
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007 - sold Sept 2012
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009 |
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cristalclear13
Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia
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Ed in JXN
Joined: 24 Mar 2006
Posts: 122
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| Posted: Tue Jul 08, 2008 8:43 am Post subject: Gyrocopter intercept |
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Hi Cristal,
Trivia is great. Good on your flying! Just relax, the examiner
wants you to do well. If you catch a mistake, repent and ask for a do-over.
Most will allow it - once.
I'd get tanked - a little - the night before. Always helped with the
nerves, but that's just me.
Anymore, the checkrides aren't a bother. I find other reasons to
get tanked tho.
Have fun, good luck!!
Ed in JXN
MKII/503
---
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mdnanwelch7(at)hotmail.co
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| Posted: Tue Jul 08, 2008 1:49 pm Post subject: Gyrocopter intercept |
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| Quote: | Hi Cristal,
What state are you in?
Ed in JXN
MkII/503
Do not archive.
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Cristal,
We all knew what state you are in!! We could tell from your accent!! Georgia, of course! Silly Ed!!
Mike Welch
_________________________________________________________________
It’s a talkathon – but it’s not just talk.
http://www.imtalkathon.com/?source=EML_WLH_Talkathon_JustTalk
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cristalclear13
Joined: 19 Sep 2007
Posts: 363
Location: Southeast Georgia
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| Posted: Tue Jul 08, 2008 6:20 pm Post subject: Re: Gyrocopter intercept |
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| mdnanwelch7(at)hotmail.co wrote: | | We could tell from your accent!! |
I might have some of "y'all" fooled since I'm originally from Illinois.
But I can't win...I go back home and they tease me for the southern accent I've picked up on and yet around here I still get teased for my northern accent... "You're not from around these parts, are ya missy?"
do not archive
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_________________
Cristal Waters
Kolb Mark II Twinstar Rotax 503 DCSI Sept 2007 - sold Sept 2012
Private Pilot Aug 2008
ELSA Repairman for N193Y April 2008
Rotax 2 stroke maintenance April 2009 |
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jb92563
Joined: 23 Mar 2007
Posts: 314
Location: Southern California
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| Posted: Wed Jul 09, 2008 7:27 am Post subject: Props & speed |
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The more blades your prop has the greater the static thrust, but as you start moving through the air those extra blades actually limit your top speed.
A 2 blade may not get you quite the same initial acceleration and climb rate but your top speed will be greater.
Your best climb would be at a higher speed with a 2 blader than with a 3 or more blades prop.
2 blader makes for a more efficient cruise prop than a 3 blader.
Ray
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Ray
Kolb UltraStar (Cuyuna UL-202)
Moni MotorGlider
Schreder HP-11 Glider
Grob 109 Motorglider
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Wed Jul 09, 2008 9:51 am Post subject: Gyrocopter intercept |
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At 11:27 AM 7/9/2008, jb92563 wrote:
| Quote: | The more blades your prop has the greater the static thrust, but as you
start moving through the air those extra blades actually limit your top speed.
A 2 blade may not get you quite the same initial acceleration and climb
rate but your top speed will be greater.
Your best climb would be at a higher speed with a 2 blader than with a 3
or more blades prop.
2 blader makes for a more efficient cruise prop than a 3 blader.
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Actually that's not quite correct, except in some limited circumstances.
The only time there is any advantage to more than two blades is if the 2
blade prop can't absorb all the power the engine produces. Generally this
is only a problem where blade size is limited, either by tip speed or by
space constraints.
If you replace a 2 blade prop with a 3 blader of the same diameter, you
will have to have less pitch in order to allow the engine to reach full
rpm, so yes, you'll get more static and low speed thrust at the expense of
cruise performance (the thrust will fall off as airspeed increases). The
extra blade(s) don't limit the speed, the lower pitch does.
The best climb speed won't change, that speed is dependent on the aircraft,
not the propeller, design. But the actual _rate_ of climb depends on the
prop efficiency.
-Dana
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Okay, who put a "stop payment" on my reality check?
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jb92563
Joined: 23 Mar 2007
Posts: 314
Location: Southern California
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| Posted: Wed Jul 09, 2008 11:41 am Post subject: Re: Gyrocopter intercept |
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Dana,
My logic behind the 2 blade, faster airspeed for best rate of climb is:
The 2 blade produces more thrust at greater airspeeds than a 3 blade so more speed equals greater lift from the wing up to some optimum point and hence a greater rate of climb.
In practice you would probably notice a flatter initial climb with a 2 blade but a greater rate of climb after your speed has increased up to that magic best climb rate speed.
If you need to clear obstacles 3 blade gives you quicker initial acceleration and rate of climb that diminishes slightly with speed and is what most field hoppers would want.
If you want to go touring/cruising a 2 blade is the way to go.....or get an inflight adjustable 2 blade and have the best of both worlds.
After seeing that my Grob 109 - Hoffman featherable 2 speed prop is $2500 for an overhaul every 5 years I figure that those inflight adjustable IVO Props at under 2K are a good deal and may save you that much in fuel costs if you cruise a lot in that many years.
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_________________
Ray
Kolb UltraStar (Cuyuna UL-202)
Moni MotorGlider
Schreder HP-11 Glider
Grob 109 Motorglider
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