Today's Message Index:
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1. 08:25 AM - Re: Phantasm Facts (Norman Younie)
2. 09:06 AM - Re: Phantasm Facts (LessDragProd@aol.com)
Message 1
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| Subject: | Re: Phantasm Facts |
--> RV7-List message posted by: Norman Younie <rv6capt@pacificcoast.net>
I hope you guys all realize that the only way to make these planes fly
faster is money.
Merry Christmas all.
Dan Checkoway wrote:
> Huh?!
> Vne on the RV-7[A] is 230mph or 200knots. You mean to tell us you're
> getting 200 knots true? Sorry, I don't buy it. I assume you're
> kidding, in the spirit of this silly thread & made-up data?
> )_( Dan
> RV-7 N714D (724 hours)
> http://www.rvproject.com
>
> ----- Original Message -----
> *From:* T Bryant <mailto:tylerii@infoave.net>
> *To:* rv7-list@matronics.com <mailto:rv7-list@matronics.com>
> *Sent:* Wednesday, December 14, 2005 3:09 PM
> *Subject:* Re: RV7-List: Phantasm Facts (was: changing props (Dear
> Jim why MT?))
>
> Yep that it is... entertaining! AFA props and engines etc. What I
> know is that the 72 inch CS Hartzell Blended airfoil prop on a
> AeroSport IO360/180 will drive a RV7A past Vne TAS at 7000 ft.
> What else matters?
> Tyler B N442TM
>
>
> Rick Rammos wrote:
>
>> You cant pay for this kind of entertainment. Hell, I might even
>> learn something.
>>
>>
>> *From:* owner-rv7-list-server@matronics.com
>> [mailto:owner-rv7-list-server@matronics.com] *On Behalf Of
>> *LessDragProd@aol.com
>> *Sent:* Wednesday, December 14, 2005 3:21 PM
>> *To:* rv7-list@matronics.com
>> *Subject:* RV7-List: Phantasm Facts (was: changing props (Dear
>> Jim why MT?))
>>
>> Good Morning Again George,
>>
>> You said, "YOU CAN'T GO FASTER ON LESS HP!"
>>
>> Using the data point you choose, and I quote:
>>
>> SWEET SPOT? You show the MTV-12 at 2300 RPM at 2500 going 186
>> mph, but at 12,500 you are going 191mph????? Impossible! Why?
>> You have
>> 156HP @ 2300 RPM at 2,500 ft. At 12,500 ft the best you could
>> do is
>> 115HP (@ 2300 RPM). 6 MPH faster on 40HP less power!
>>
>> According to the Lycoming data for the O-360 engine used and the
>> actual flight conditions, the engine was producing 134 hp at
>> 2,500 feet and 103 hp at 12,500 feet.
>>
>> As might be expected, the indicated airspeed at 2,500 feet was
>> higher than the indicated airspeed at 12,500 feet.
>>
>> Specifically, 176 mph ias at 2,500 feet and 150 mph ias at 12,500
>> feet.
>>
>> When corrected for the density altitude, the True Indicated
>> Airspeed was 187 mph at 2,500 feet and 191 mph at 12,500 feet.
>> (These are the summary numbers shown in the website data.)
>>
>> And that's how you go faster on less power.
>>
>> And theatrically, on 2.6 gph less fuel. (With a greater fuel
>> savings at altitude, if the aircraft owner is unwilling to lean
>> to 30 degrees C ROP at the lower altitudes and higher power
>> settings achievable 3.3 gph decrease shown in the website data.)
>>
>> Regards,
>>
>> Jim Ayers
>>
>> www.lessdrag.com <http://www.lessdrag.com>
>>
>> The website data being discussed is on the "Lycoming O-360
>> propeller" page. Just open the page and scroll down to it.
>>
>
Message 2
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| Subject: | Re: Phantasm Facts |
Everyone keeps telling me that MT Propeller has already figured that out.
:-)
Happy Holidays all,
Jim Ayers
In a message dated 12/15/2005 8:32:03 AM Pacific Standard Time,
rv6capt@pacificcoast.net writes:
--> RV7-List message posted by: Norman Younie <rv6capt@pacificcoast.net>
I hope you guys all realize that the only way to make these planes fly
faster is money.
Merry Christmas all.
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