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  #1  
Old 04-07-2016, 09:23 AM
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rjcthree rjcthree is offline
 
Join Date: Jan 2007
Location: Bay Village, OH
Posts: 684
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 90432
First Flight 2017apr23 - in Phase 1
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Dog is my copilot, rest in peace 2015APR28. I miss that dog.
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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: 2,299
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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Perry Y.
RV-9a - SOLD!....got a Glastar TD now!!!
Providing lifetime tech support to the new owner of C-FINT!...and kinda missing it!
Lake Country, BC

....paid up til Nov. 2017
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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: PA
Posts: 526
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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Mark
RV-9A; IO-320 w/ Whirlwind WW-151
(Flying since June 2011)
2017 =VAF= donor
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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: 252
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 500+ 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!

2017 donation: complete
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  #6  
Old 04-07-2016, 11:29 PM
Mark C. Mark C. is offline
 
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Location: Schaumburg
Posts: 115
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: 230
Default

Yes, a copy please. Thanks Mark
phuish@bigpond.com
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Pete
RV-9 "Cloud tinnie"
Registered VH-EAB
Putting it altogether for W&B
Then fuel flow test.
IO 320 D1A
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  #8  
Old 04-08-2016, 04:45 AM
FredMagare FredMagare is offline
 
Join Date: Mar 2006
Location: Kyle, TX
Posts: 514
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.)
Frederic.magare "at" gmail.com
RV-9A SB Fuselage
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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
RV-7A: Flying since April 15, 2012. 650hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
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My RV Construction Page
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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
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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 - VAF 2017 dues paid
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N16GN flying! http://websites.expercraft.com/airguy/
Built an off-plan 9A with too much fuel and too much HP. Should drop dead any minute now.
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