RV8-List Digest Archive

Wed 08/18/10


Total Messages Posted: 3



Today's Message Index:
----------------------
 
     1. 04:16 AM - Re: Re: RV Speeds (Gordon or Marge)
     2. 05:49 PM - Re: Nutplate installation (Speedy11@aol.com)
     3. 06:22 PM - Re: RV Speeds (Speedy11@aol.com)
 
 
 


Message 1


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    Time: 04:16:54 AM PST US
    From: "Gordon or Marge" <gcomfo@tc3net.com>
    Subject: Re: RV Speeds
    You have different props, right? Gordon Comfort -----Original Message----- From: owner-rv8-list-server@matronics.com [mailto:owner-rv8-list-server@matronics.com] On Behalf Of Matt Dralle Sent: Wednesday, August 18, 2010 12:01 AM Subject: Re: RV8-List: Re: RV Speeds Looks to me like your RPMs are WAY too high! At 5.5gph I was at 2000 RPM. Lowering the RPM is how you get the flow rates down. Bigger bite might make you go faster too. I want to say that at 5.5/2000/18000/170mph I was at about 12.5" MP. I think that I took still pictures of the EFIS's in all the various configurations I did. I'll download them from the Camera and double check my numbers. Matt At 08:36 PM 8/17/2010 Tuesday, you wrote: > >Well, I had to see what my IO-390 RV-8A would do at 18K, so today I >climbed to 17,500 (couldn't get ATC clearance higher) and had the >following numbers: 15.4" MP - 2400 RPM - 8.5 GPH - KIAS 124 - KTAS 166 >(191 MPH) 15.4" MP - 2310 RPM - 9.0 GPH - KIAS 120 - KTAS 162 (186 MPH) >Fuel pump was out of service, so I'll confirm the actual fuel burn next >week. I'm simply not getting your numbers, Matt. Must be my ham fisted >flying. I can't imagine that the engines are that much different. >Scratching my cranium. Stan Sutterfield Matt, I must be doing something >wrong because my IO-390 powered RV-8A numbers >aren't even close to yours. >At 7K', to get 177 KTAS (204 MPH TAS) I have to burn 10.2 GPH and turn 2450 >RPM. I can get 3000 FPM climb, but only to pattern altitude. Enroute >climb at 145-150 KIAS produces only 600 FPM. I've climbed to 15.5K' and I'm >planning a test flight to FL240 - to see if it will make it. >I have Bower's ram air and a MT 3 blade - both of which should help with >high altitude performance. >I'm planning a trip from FL to VT in 2 weeks, so I'll see how my cruise >numbers are after that flight. >But, with the numbers I have now, I'm nowhere near your numbers. >I wonder why? >Stan Sutterfield >rv-8a.net > >On the way home, I had the IO-390 engine dialed in at 7000ft, 22.4" MP >/ 2200 RPM and 204 MPH True at 8.8 GPH. Earlier in the week I took it to >18,000ft >(on oxygen) and was seeing 170 MPH True at 5.5 GPH, 192 MPH @ 6.5 GPH, and >202 MPG @ 7 GPH. At the 5.5 GPH, that's about a 1300 mile range less >reserves. >Coupled with the 3000+ FPM climb solo > Matt G Dralle | Matronics | 581 Jeannie Way | Livermore | CA | 94550 925-606-1001 V | 925-606-6281 F | dralle@matronics.com Email http://www.matronics.com/ WWW | Featuring Products For Aircraft


    Message 2


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    Time: 05:49:18 PM PST US
    From: Speedy11@aol.com
    Subject: Re: Nutplate installation
    I'm not sure if I'm the Stan you are addressing, but I have used Cherry Max rivets. They work great. They are also expensive. Used in certain applications, they can be less expensive than the time spent trying to do the job otherwise. I have used, and like, Cherry Max rivets. Stan Sutterfield www.rv-8a.net Have you tried nutplate rivets? They can be installed with a standard rivet puller


    Message 3


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    Time: 06:22:34 PM PST US
    From: Speedy11@aol.com
    Subject: Re: RV Speeds
    Those are amazing numbers. 230 true MPH would be 200 KTAS. That is 6 knots more than I am getting. The only thing I can think of is that my Barrett IO-390 is not producing full power. If my engine were producing only 190 HP at sea level and yours were producing 210 HP, then that would likely make the difference in speeds. Maybe I should talk to Allen about the engine. The original dyno run was low on power but that was attributed to high density altitude at the time. It should be producing a solid 210 HP since I asked them to mill .015 off the cylinder bases to increase compression a bit. I also have an oil leak (since new) directly over the alternator. I haven't yet discovered the source. Maybe I should fly the plane to OK and talk to Allen and Monty about the engine. Might be a good reason for a nice flight. Stan Sutterfield On multiple occasions, I have seen a top speed of 229-230 mph true at about 2000 msl, full throttle, and 2700 rpm, and gently leaned. This was confirmed by the GPS GS from both the EFIS GPS and the Kenwood GPS. The autopilot was on to assure no ascending/descending error. These were on cool evenings (70-75f). That being said, there are other days when it won't go much above 222-225 mph.




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