---------------------------------------------------------- Rocket-List Digest Archive --- Total Messages Posted Tue 05/06/03: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:35 PM - Re: Re: RV-8 with O-540 in this months EAA Sport Aviation (Boyd C. Braem) 2. 01:22 PM - Re: Re: RV-8 with O-540 in this months EAA Sport Aviation (C. Rabaut) 3. 01:36 PM - Re: Re: RV-8 with O-540 in this months EAA Sport Aviation (Bob Japundza) 4. 03:39 PM - Re: Re: RV-8 with O-540 in this months EAA Sport Aviation (Ron C) 5. 07:28 PM - Re: Re: RV-8 with O-540 in this months EAA Sport Aviation (Russ Werner) ________________________________ Message 1 _____________________________________ Time: 12:35:42 PM PST US From: "Boyd C. Braem" Subject: Re: Rocket-List: Re: RV-8 with O-540 in this months EAA Sport Aviation --> Rocket-List message posted by: "Boyd C. Braem" Bob-- What's this "overloading the wings" stuff? They're still built to +6/-3g, aren't they? Are these guys "who did their homework" saying that because of a little extra engine and battery weight that their wings are more likely to depart the airframe in a "normal flight" envelope? Something is not right with this picture. What is the empty weight of these airplanes? And, (reaching under the desk for my soapbox) why go to all the trouble with a Super-8 mod and not go with an IO-540 (esp. up there in the Midwest where icing is much more prevalent than down here in SW Florida)? And, mmmnph, mmnnnppphhh....Oh, thanks, honey--I was starting to drool, there, wasn't I? Boyd RV-Super 6/325 LyCon hp design gross weight 1900#--flight tested to 2000#--guess what my design aerobatic weight is? wings chopped 7" ala Harmon Rocket--lotsa good advice out there in Bakersfield for anyone wanting to put a -540 in any RV. Bob Japundza wrote: >--> Rocket-List message posted by: Bob Japundza > >The super-8 in SA is owned by a friend of mine. There are four super-8's flying here in Indy, and those guys did their homework. They have to be very careful flying them in normal flight out of fear of overloading the wings. They use a larger 35ah battery mounted mid-way in the tailcone. They are about 10mph slower than a Rocket at cruise. Regards, Bob > >P M Condon wrote:--> Rocket-List message posted by: P M Condon > > >There is a picture in the "what our members are building" section of the >latest EAA sport Aviation mag of a RV-8 with a O-540. A few folks over >the years have done this with 8's & sixes. Has anyone done the W&B and >other studies to see the extent of such a undertaking?? > > > > ________________________________ Message 2 _____________________________________ Time: 01:22:59 PM PST US From: "C. Rabaut" Subject: Re: Rocket-List: Re: RV-8 with O-540 in this months EAA Sport Aviation --> Rocket-List message posted by: "C. Rabaut" Boyd, Okay... I'll bite, what's your Super 6's aerobatic gross weight limit? BTW, I think the reference about ripping off the wings was the cruise speed being so high. Although I'm not sure, because the way I understand it anything above 130 mph and your stick theoretically has all the "G's" at its disposal to become "The Wing Removal Lever". And even my lowly RV-4 (IO-320) has that capability, at far less than max cruise. Chuck do not archive ----- Original Message ----- From: Boyd C. Braem Subject: Re: Rocket-List: Re: RV-8 with O-540 in this months EAA Sport Aviation > --> Rocket-List message posted by: "Boyd C. Braem" > > Bob-- > > What's this "overloading the wings" stuff? They're still built to > +6/-3g, aren't they? Are these guys "who did their homework" saying > that because of a little extra engine and battery weight that their > wings are more likely to depart the airframe in a "normal flight" > envelope? Something is not right with this picture. What is the empty > weight of these airplanes? And, (reaching under the desk for my > soapbox) why go to all the trouble with a Super-8 mod and not go with an > IO-540 (esp. up there in the Midwest where icing is much more prevalent > than down here in SW Florida)? And, mmmnph, mmnnnppphhh....Oh, thanks, > honey--I was starting to drool, there, wasn't I? > > Boyd > RV-Super 6/325 LyCon hp > design gross weight 1900#--flight tested to 2000#--guess what my design > aerobatic weight is? > wings chopped 7" ala Harmon Rocket--lotsa good advice out there in > Bakersfield for anyone wanting to put a -540 in any RV. > > Bob Japundza wrote: > > >--> Rocket-List message posted by: Bob Japundza > > > >The super-8 in SA is owned by a friend of mine. There are four super-8's flying here in Indy, and those guys did their homework. They have to be very careful flying them in normal flight out of fear of overloading the wings. They use a larger 35ah battery mounted mid-way in the tailcone. They are about 10mph slower than a Rocket at cruise. Regards, Bob > > > >P M Condon wrote:--> Rocket-List message posted by: P M Condon > > > > > >There is a picture in the "what our members are building" section of the > >latest EAA sport Aviation mag of a RV-8 with a O-540. A few folks over > >the years have done this with 8's & sixes. Has anyone done the W&B and > >other studies to see the extent of such a undertaking?? > > > > > > > > > > ________________________________ Message 3 _____________________________________ Time: 01:36:25 PM PST US From: Bob Japundza Subject: Re: Rocket-List: Re: RV-8 with O-540 in this months EAA Sport Aviation --> Rocket-List message posted by: Bob Japundza Boyd, the wings on the Super-8's aren't chopped down like the Rockets or your airplane. Couple that with a significantly higher empty weight and higher cruise speeds, a wing that's already longer than a RV-4 wing, it is possible to overstress the wings when going thru turbulence since they are cruising right on the RV-8's designed red-line, when operating at 75%. These guys usually loaf around under 50% power at typical RV speeds/fuel burns so life is smooth and quiet. Unlike the Rockets with the heavier skins up front and other structure mods, these are stock airframes, so there is some merit to their thinking--just being careful. I don't know off hand what their empty weights were. Three of them are carbureted, and that was just out of personal preference, ease of maintenance, starting, etc. The reason for using a 540 is there's more bang for the buck there. Regards, Bob "Boyd C. Braem" wrote:--> Rocket-List message posted by: "Boyd C. Braem" Bob-- What's this "overloading the wings" stuff? They're still built to +6/-3g, aren't they? Are these guys "who did their homework" saying that because of a little extra engine and battery weight that their wings are more likely to depart the airframe in a "normal flight" envelope? Something is not right with this picture. What is the empty weight of these airplanes? And, (reaching under the desk for my soapbox) why go to all the trouble with a Super-8 mod and not go with an IO-540 (esp. up there in the Midwest where icing is much more prevalent than down here in SW Florida)? And, mmmnph, mmnnnppphhh....Oh, thanks, honey--I was starting to drool, there, wasn't I? Boyd RV-Super 6/325 LyCon hp design gross weight 1900#--flight tested to 2000#--guess what my design aerobatic weight is? wings chopped 7" ala Harmon Rocket--lotsa good advice out there in Bakersfield for anyone wanting to put a -540 in any RV. Bob Japundza wrote: >--> Rocket-List message posted by: Bob Japundza > >The super-8 in SA is owned by a friend of mine. There are four super-8's flying here in Indy, and those guys did their homework. They have to be very careful flying them in normal flight out of fear of overloading the wings. They use a larger 35ah battery mounted mid-way in the tailcone. They are about 10mph slower than a Rocket at cruise. Regards, Bob > >P M Condon wrote:--> Rocket-List message posted by: P M Condon > > >There is a picture in the "what our members are building" section of the >latest EAA sport Aviation mag of a RV-8 with a O-540. A few folks over >the years have done this with 8's & sixes. Has anyone done the W&B and >other studies to see the extent of such a undertaking?? > > > > --------------------------------- ________________________________ Message 4 _____________________________________ Time: 03:39:06 PM PST US From: "Ron C" Subject: RE: Rocket-List: Re: RV-8 with O-540 in this months EAA Sport Aviation --> Rocket-List message posted by: "Ron C" Whoa!!! Boyd! Chill out dude don't blow a base gasket. Remember " " "EXPERIMENTAL" " " , get it? Hey, by the way, I noticed you list your Ly-Con 540 at 325 hp. Would you mind listing whats been done to that bad boy and at what settings your getting that much power? I have a balanced 540 with 10 to ones and have been wondering how much it actually puts out- it has not been dynoed. At full blow im doing 250 at 5,500 msl Thanks Ron Carter HRII #49 335 ttsn -----Original Message----- From: owner-rocket-list-server@matronics.com [mailto:owner-rocket-list-server@matronics.com] On Behalf Of Boyd C. Braem Subject: Re: Rocket-List: Re: RV-8 with O-540 in this months EAA Sport Aviation --> Rocket-List message posted by: "Boyd C. Braem" Bob-- What's this "overloading the wings" stuff? They're still built to +6/-3g, aren't they? Are these guys "who did their homework" saying that because of a little extra engine and battery weight that their wings are more likely to depart the airframe in a "normal flight" envelope? Something is not right with this picture. What is the empty weight of these airplanes? And, (reaching under the desk for my soapbox) why go to all the trouble with a Super-8 mod and not go with an IO-540 (esp. up there in the Midwest where icing is much more prevalent than down here in SW Florida)? And, mmmnph, mmnnnppphhh....Oh, thanks, honey--I was starting to drool, there, wasn't I? Boyd RV-Super 6/325 LyCon hp design gross weight 1900#--flight tested to 2000#--guess what my design aerobatic weight is? wings chopped 7" ala Harmon Rocket--lotsa good advice out there in Bakersfield for anyone wanting to put a -540 in any RV. Bob Japundza wrote: >--> Rocket-List message posted by: Bob Japundza > >The super-8 in SA is owned by a friend of mine. There are four >super-8's flying here in Indy, and those guys did their homework. They >have to be very careful flying them in normal flight out of fear of >overloading the wings. They use a larger 35ah battery mounted mid-way >in the tailcone. They are about 10mph slower than a Rocket at cruise. >Regards, Bob > >P M Condon wrote:--> Rocket-List message posted by: >P M Condon > > >There is a picture in the "what our members are building" section of >the latest EAA sport Aviation mag of a RV-8 with a O-540. A few folks >over the years have done this with 8's & sixes. Has anyone done the W&B >and other studies to see the extent of such a undertaking?? > > > > direct advertising on the Matronics Forums. ________________________________ Message 5 _____________________________________ Time: 07:28:50 PM PST US From: "Russ Werner" Subject: RE: Rocket-List: Re: RV-8 with O-540 in this months EAA Sport Aviation --> Rocket-List message posted by: "Russ Werner" Ron, What's your takeoff fuel flow at sea level? That is a pretty good indicator (and BS filter). I believe you can figure something like: ff divided by .1 on most piston engines. I'm told it is impossible to get more than 300 with an RSA5 due to fuel delivery limitations. The bigger injection units can do it however. Russ > I have a balanced 540 with 10 to ones and have > been wondering how much it actually puts out- it has not been dynoed. At > full blow im doing 250 at 5,500 msl >