---------------------------------------------------------- RV8-List Digest Archive --- Total Messages Posted Thu 08/19/10: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:50 AM - image 1 (Dale Ellis) 2. 11:23 AM - Re: Re: RV Speeds (Richard Martin) 3. 12:04 PM - Re: Re: RV Speeds (Robin Marks) 4. 05:01 PM - Re: RV8-List Digest: 3 Msgs - 08/18/10 (Speedy11@aol.com) ________________________________ Message 1 _____________________________________ Time: 08:50:36 AM PST US Subject: RV8-List: image 1 From: Dale Ellis 1 ________________________________ Message 2 _____________________________________ Time: 11:23:12 AM PST US Subject: Re: RV8-List: Re: RV Speeds From: Richard Martin Stan, I hate to tell you this, but your inability to achieve the higher speeds is to sell your 3 blade MT to some one you do not like, and use the proceeds to buy either the New blended airfoil blade Hartzell from Vans AC, or better yet, buy a Aerocomposites 2 blade 72 or 74 inch propeller. Also, you could contact Same James and consider one of his cowlings and plenum chambers (proven speed prudecers). Good luck. Dick Martin RV8 N233M the fast one On Tue, Aug 17, 2010 at 10:36 PM, 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 > > * > > > * > > ________________________________ Message 3 _____________________________________ Time: 12:04:20 PM PST US From: Robin Marks Subject: RE: RV8-List: Re: RV Speeds Dick, I take exception to your usually EXCELLENT advice regarding the James cowl & plenum combination. I am placing one on my 8A (yet to fly) strictly for looks but I have also installed one on my RV-10 to near disastrous results. Significantly higher CHT=92s and oil temps, poor airflo w top to bottom and slower TAS. There is absolutely no engineering associated with the RV-10 James cowl & plenum regardless of what one hears or is told. And much like the two place James cowls that require a modification including additional fill for even a basic proper fit the James Plenum for the -10 does not even align with the cowl inlet openings. Speaking of the inlet openings on the -10 cowl they are the same 4.5=94 openings used in th e two place RV=92s. This MAY be the source of the temp issues as one builder has modified the cowl for custom made 6=94 inlet rings to apparent success in cooling. Think of the effort required to hack out the 4.5=94 rings and repl ace with 6=94 rings. Both the upper & lower cowl have to be mutilated to make r oom for this mod. Then one has to rework the baffles, inlet ramps etc=85 You ar e truly in the experimental world a that point. The -10 cowl has cost me well over $14K in R&D, modifications (oil coolers, turbo injectors=85), wasted f uel and I still have not properly resolved the issues. Who knows what damage th e extra heat has caused to my new $45K engine. If I were to do it again I would absolutely NOT install the James Cowl on my -10. I am pretty sure the stock cowl is faster too. I knowingly installed the James cowl on my 8A because there are many more success stories with the 4 cylinder versions. Good luck, Robin Do Not Archive *From:* owner-rv8-list-server@matronics.com [mailto: owner-rv8-list-server@matronics.com] *On Behalf Of *Richard Martin *Sent:* Thursday, August 19, 2010 11:15 AM *To:* rv8-list@matronics.com *Subject:* Re: RV8-List: Re: RV Speeds Stan, I hate to tell you this, but your inability to achieve the higher speeds is to sell your 3 blade MT to some one you do not like, and use the proceeds t o buy either the New blended airfoil blade Hartzell from Vans AC, or better yet, buy a Aerocomposites 2 blade 72 or 74 inch propeller. Also, you coul d contact Same James and consider one of his cowlings and plenum chambers (proven speed prudecers). Good luck. Dick Martin RV8 N233M the fast one On Tue, Aug 17, 2010 at 10:36 PM, 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 * * * * *et="_blank">http://www.matronics.com/Navigator?RV8-List* * * *ttp://forums.matronics.com* *_blank">http://www.matronics.com/contribution* * * * * * * ===========* ===========* ===========* ===========* * * ________________________________ Message 4 _____________________________________ Time: 05:01:23 PM PST US From: Speedy11@aol.com Subject: RV8-List: Re: RV8-List Digest: 3 Msgs - 08/18/10 Yes - but not 6 knots different. Stan You have different props, right? 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