---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Mon 01/05/15: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:35 AM - Re: Re: New Engine Questions (William Greenley) 2. 06:46 AM - Re: Re: New Engine Questions (Kelly McMullen) 3. 08:25 AM - Ram air (bob88) 4. 08:43 AM - Re: New Engine Questions (rv10flyer) 5. 08:53 AM - Re: Ram air (Bob Leffler) 6. 09:24 AM - Re: Ram air (bob88) 7. 09:43 AM - Re: Painting the Baffles (Flysrv10) 8. 09:54 AM - Re: Re: Ram air (Bob Leffler) ________________________________ Message 1 _____________________________________ Time: 06:35:11 AM PST US Subject: Re: RV10-List: Re: New Engine Questions From: William Greenley Reports I have heard say that the two blade can be just as smooth if you get it dynamically balanced. On Sun, Jan 4, 2015 at 11:54 PM, rv10flyer wrote: > > I would go with the three blade Hartzell for less vibration if doing it > over and I had plenty of money in the bank. Who cares about a few knots on > a 3-4 hr trip. Just get to the airport 10 minutes earlier. > > -------- > Wayne G. > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=436642#436642 > > ________________________________ Message 2 _____________________________________ Time: 06:46:37 AM PST US From: Kelly McMullen Subject: Re: RV10-List: Re: New Engine Questions A two blade can be made relatively smooth with dynamic balancing. It will not be as smooth as a balanced 3 blade. Simple physics. A six cylinder fires every 120 degrees. A three bladed prop has the blades 120 degrees apart. Same reason a 2 blade is smoother on a 4 cyl engine than a 3 blade, because a 4 cyl fires every 180 degrees. A composite prop, whether carbon fiber, or fiberglass over wood will be smoother than a metal blade, because the composite blades have some flex and absorb vibration. Composite blades allow more optimization of blade shape than is possible with metal, so they tend to have less speed difference than a metal 3 blade. I've seen many reports of 3 bladed composite giving up no detectable speed to a 2 blade metal prop. However, blades cost money, composite costs money. So 2 blade aluminum will always be your lowest cost if marketing doesn't play games. On 1/5/2015 7:32 AM, William Greenley wrote: > Reports I have heard say that the two blade can be just as smooth if > you get it dynamically balanced. > > On Sun, Jan 4, 2015 at 11:54 PM, rv10flyer > wrote: > > > > > I would go with the three blade Hartzell for less vibration if > doing it over and I had plenty of money in the bank. Who cares > about a few knots on a 3-4 hr trip. Just get to the airport 10 > minutes earlier. > > -------- > Wayne G. > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=436642#436642 > > > ========== > br> fts!) > r> > com" target="_blank">www.aeroelectric.com > w.buildersbooks.com" target="_blank">www.buildersbooks.com > p.com" target="_blank">www.homebuilthelp.com > e.com" target="_blank">www.mypilotstore.com > " target="_blank">www.mrrace.com > target="_blank">http://www.matronics.com/contribution > -Matt Dralle, List Admin. > ========== > -List" target="_blank">http://www.matronics.com/Navigator?RV10-List > ========== > FORUMS - > _blank">http://forums.matronics.com > ========== > > > * > > > * ________________________________ Message 3 _____________________________________ Time: 08:25:18 AM PST US Subject: RV10-List: Ram air From: "bob88" Anyone with experience using the Rod Bower ram air unit in place of the Vans air box and filter? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436651#436651 ________________________________ Message 4 _____________________________________ Time: 08:43:59 AM PST US Subject: RV10-List: Re: New Engine Questions From: "rv10flyer" Mine has been dynamically balanced and I have flown behind both props. I just did not have the funds for the upgrade. We still love our family hauler. -------- Wayne G. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436652#436652 ________________________________ Message 5 _____________________________________ Time: 08:53:33 AM PST US From: Bob Leffler Subject: Re: RV10-List: Ram air Yes. I have one and probably wouldn't install it if I did another build. It does work as advertised, but there is no data that compares it in a standard configuration. Open it will increase manifold pressure. Closed because its using air from the cowl, it's unclear if running in a reduced power state. Sent from my iPhone On Jan 5, 2015, at 11:22 AM, bob88 wrote: Anyone with experience using the Rod Bower ram air unit in place of the Vans air box and filter? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436651#436651 ________________________________ Message 6 _____________________________________ Time: 09:24:30 AM PST US Subject: RV10-List: Re: Ram air From: "bob88" I presume there is no need for alternate air with the Bower unit as it seems to be using alternate air whenever closed in any case. Alternate air in my Cessna causes significant drop in MP relative to regular intake through the air filter. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=436654#436654 ________________________________ Message 7 _____________________________________ Time: 09:43:11 AM PST US From: Flysrv10 Subject: Re: RV10-List: Painting the Baffles Mine is Aldine. Looks great after 8 yrs and 900 hrs. Do not archive. Sent from my iPhone > On Jan 4, 2015, at 12:09 AM, Vernon Franklin w rote: > > Are there any protective benefits to painting the baffles? Or do most jus t let their baffles go au naturel? > > Paint, clear coat, or primer? What products can take the heat and are saf e to use? > > -- > Vernon Franklin > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > ________________________________ Message 8 _____________________________________ Time: 09:54:42 AM PST US From: Bob Leffler Subject: Re: RV10-List: Re: Ram air The drop in MP is what I alluded to in my previous email. There are folks that believe that the use of the hotter cowl air yields a lower MP than the stand intake with a filter. I typically get 27.7 MP. Since there has been no test on the same aircraft and engine, there is no data to prove or disprove that theory. The other non-answered question is with the ram air, how much more MP is there over a standard configuration with filtered air? It is true you get about an inch of boost between closed an open, buts unclear to me if it really benefits over a standard installation. I knob that I seem to be a tad slower than Geoff's and about the same as Dana's. What is causing the differences is yet to be determined. Different air filters, fuel injection, electronic ignition, etc could also have an impact. It's just darn impossible to get the data to do a more scientific comparison. Sent from my iPhone On Jan 5, 2015, at 12:22 PM, bob88 wrote: I presume there is no need for alternate air with the Bower unit as it seems to be using alternate air whenever closed in any case. Alternate air in my Cessna causes significant drop in MP relative to regular intake through the air filter. 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