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  #1  
Old 04-07-2016, 09:23 AM
rjcthree's Avatar
rjcthree rjcthree is online now
 
Join Date: Jan 2007
Location: Bay Village, OH
Posts: 939
Default Vx, Vy rates

I've done some searching and found a little bit on information, but directly not related to RV-9/9A.

For those of you flying, can you provide:
Vx and climb rate at solo/light weight
Vy and climb rate at solo/light weight
An estimate of what that solo/light weight is
Your engine (HP) and prop combination

From this we should be able to generate a deck angle for fuel flows, and I can put estimates into my program schedule for my prelim POH . I'll summarize and report back for future travellers. Even partial information would help. Either response here or IM works.

Thanks in advance. Rick
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Rick
RV-9A N183RC/90432: tip-up, O320H2, Ellison, Dynon D180, CPi2, Sen GA, at KLPR
RV-8 83718, wing kit, tanks done, with a four year plus plan - on hold due to home move
2011-2021 VAF contributor
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  #2  
Old 04-07-2016, 12:15 PM
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flyboy1963 flyboy1963 is offline
 
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Location: Lake Country, B.C. Canada
Posts: 2,423
Default good idea....please publish!

Great info to see,
so far, I'd say not a lot of replies as a good chunk of folks don't have real hard data except for the initial test flight or two...you just never get around to correcting for temp, and repeating at all different weights and loading ( I suppose most just test at gross???)
Once you see that the -9 climbs at this or that IAS, that's as far as most of us go. More elusive even are takeoff & landing DISTANCES!

I'll dig mine up and send to you.
thx for doing this!
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RV-9a - SOLD!....
Lake Country, BC
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  #3  
Old 04-07-2016, 01:41 PM
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MS19087 MS19087 is offline
 
Join Date: Nov 2006
Location: West Chester, PA
Posts: 740
Default My starting point . . .

This was a starting point i used on my RV-9A and adjusted after Phase 1 testing.

Configuration:
IO-320 (165HP)
F/P Prop

Your numbers must be verified during Phase 1 testing:

VNE Never Exceed Speed 182 kts
VNO Maximum Structural Cruising Speed 156 kts
VA Maneuvering Speed 102 kts
VFE Maximum Flap Extended Speed 78 kts
Vy Best Rate of Climb 81 kts
Vx Best Angle of Climb 70 kts
Vs Stall Speed, Clean 50 kts
Vso Stall Speed, Landing Configuration 43 kts
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RV-9A; Built, Flown & Sold
RV-14A; Building
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  #4  
Old 04-07-2016, 06:27 PM
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JohnInReno JohnInReno is offline
 
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Location: Prescott Valley/Chandler AZ
Posts: 351
Default Cafe

I was going to post the link to the CAFE report on Van's 9A, but the links all return a 403 error:

http://cafe.foundation/v2/research_aprs.php

My numbers are very similar to Mark's once I found the leak in the pitot/static system.
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John Morgensen
RV-9A N946PM 600+ hours since 2013
Nevada/Arizona
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  #5  
Old 04-07-2016, 11:02 PM
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ArVeeNiner ArVeeNiner is offline
 
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Location: San Jose, CA
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Default

Quote:
Originally Posted by JohnInReno View Post
I was going to post the link to the CAFE report on Van's 9A, but the links all return a 403 error:

http://cafe.foundation/v2/research_aprs.php

My numbers are very similar to Mark's once I found the leak in the pitot/static system.
I have a PDF of this report. I can email a copy to anybody who wants it.
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Kelly Johnson
San Jose, CA
RV-9A

Pink slip issued: 5/7/12

First flight: 5/28/12, Memorial Day.

Phase I Complete: 8/18/12!

2020 donation: complete
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  #6  
Old 04-07-2016, 11:29 PM
Mark C. Mark C. is offline
 
Join Date: Nov 2009
Location: Schaumburg
Posts: 119
Default

Kelly, I would like to see it. Thanks, Mark C.

mjcoplon@te.com
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  #7  
Old 04-08-2016, 03:35 AM
Hornet2008 Hornet2008 is offline
 
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Location: NSW Australia
Posts: 302
Default

Yes, a copy please. Thanks Mark
phuish@bigpond.com
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RV-9 "Cloud tinnie"
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Flying Phase 2
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  #8  
Old 04-08-2016, 04:45 AM
FredMagare FredMagare is offline
 
Join Date: Mar 2006
Location: Kyle, TX
Posts: 567
Default

If it is not too much trouble, Sir: Frederic.magare "at" gmail.com

Thank you for your time and consideration.
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GySgt, USMC (Ret.)
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Frederic.magare "at" gmail.com
RV-9A Finishing
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  #9  
Old 04-08-2016, 05:13 AM
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rzbill rzbill is offline
 
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Location: Asheville, NC
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Default

Quote:
Originally Posted by rjcthree View Post
From this we should be able to generate a deck angle for fuel flows
I'm curious what this means, could you expand on it a little?
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Bill Pendergrass
ME/AE '82
RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
Unpainted, polished....kinda'... Eyeballin' vinyl really hard.
Yeah. The boss got a Silhouette Cameo 4 Xmas 2019.
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  #10  
Old 04-08-2016, 08:53 AM
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airguy airguy is offline
 
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Location: Garden City, Tx
Posts: 5,319
Default

I would like a copy of that report also please - greg dot niehues at ngsgi dot com.

Quote:
Originally Posted by rzbill View Post
I'm curious what this means, could you expand on it a little?
I think he's talking about testing the fuel flows on the ground before first flight, making sure the flow is adequate with high nose-up angles where the fuel is pumped "uphill" to the engine.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 750 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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