---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Tue 09/15/15: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:02 AM - Re: Kolb-List Digest: 1 Msgs - 09/14/15 (b young) 2. 10:33 AM - firefly behind schedule... (Herb) 3. 12:13 PM - Re: Firefly Lift Struts (Dave Kulp) 4. 01:50 PM - Re: Firefly Lift Struts (Herb) ________________________________ Message 1 _____________________________________ Time: 07:02:45 AM PST US From: "b young" Subject: Kolb-List: Re: Kolb-List Digest: 1 Msgs - 09/14/15 Now I have a set of wings...built , covered and painted...and am wondering if anyone has built single lift struts in place of the dual ones? I have streamlined material to cover them with... >>>>>>>>>>>>>>> going from memory here, use this information as a starting place for your research. as I remember the firefly paperwork that I read mentioned that the 2 struts was necessary to keep the plane within the speed requirements of part 103. I dont know how the struts mount,,, but I would think a T would not be as robust as something that is triangulated, also I have no information on the torsion loads on the wing.... if they are using the 2 struts to help handle the torsion loads of the wing a tee would eliminate that support and the wing could be unstable. and any twisting on the T would cause metal fatigue and possible failure. unless you are smarter than the designer... my opinion would be to stay with a proven design.... boyd --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 2 _____________________________________ Time: 10:33:38 AM PST US Subject: Kolb-List: firefly behind schedule... From: Herb Color on the wings yesterday...fuselage today...ran engine for abt an hour... top rpm's were 5400...with the 60" two blade warp set at 32 inch pitch... I will try 30 tomorrow... sorry Bro. Pike for the large pic....too tired to resize...:-) Herb Ps...forgot that I need to install the velcro for the wing center section!!!! always something..!! ________________________________ Message 3 _____________________________________ Time: 12:13:03 PM PST US Subject: Re: Kolb-List: Firefly Lift Struts From: Dave Kulp Herb, Don Gheridini built the FlagFly with single struts. The strut was faired like the shape of a wing with inserts at each end. Of course the lower was a single pin and the upper fit inside both wing receivers for a total of 3 safety pins per wing. It was probably stronger than the original and not only reduced the drag component due to half the struts, but the shape of the strut as well. With the full windscreen and the single struts, as well as extra polyester to form almost a full enclosure, I would cruise at about 68 mph at 5400 RPMs. Attached is a pic where you can see how it looked on each side. Hope this helps. Dave Kulp Bethlehem, PA On 9/14/2015 10:03 PM, Herb wrote: > > > I built a set of new wings for my First Firefly...used 5" H sections > as is used on the Firestar... > > Now I have a set of wings...built , covered and painted...and am > wondering if anyone has built single lift struts in place of the dual > ones? I have streamlined material to cover them with... > > Thinking that a cro molly tube with the same fittings as the > Firestar would work for the fuselage end and some sort of "T" for the > wing end...That is...the lift strut would resemble a "T" with the > lift strut welded to a cross piece of cromolly...and a long bolt > would go through the tangs and the cross tube on the lift strut... > > anyone ever seen this done? Wondering what size cro molly tube > would be required... ? > > As to the Firefly..finally got some color on the wings...and next > and last is to add some color to the fuselage..ala the Factory Paint > job... Herb > > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 4 _____________________________________ Time: 01:50:53 PM PST US Subject: Re: Kolb-List: Firefly Lift Struts From: Herb Very close to my idea...thanks.... I would use cro molly tubing with a streamlined pvc strut covering, which I have ...The lower attach point would be the same as now..but modified just a bit...to accept the single strut... or could use the crushed tube per other Kolbs... Should be as strong if not stronger...as you say...I do not see any danger of twisting moments creating fatigue on the tangs...Herb On 09/15/2015 02:01 PM, Dave Kulp wrote: > Herb, > > Don Gheridini built the FlagFly with single struts. The strut was > faired like the shape of a wing with inserts at each end. Of course > the lower was a single pin and the upper fit inside both wing > receivers for a total of 3 safety pins per wing. It was probably > stronger than the original and not only reduced the drag component due > to half the struts, but the shape of the strut as well. With the full > windscreen and the single struts, as well as extra polyester to form > almost a full enclosure, I would cruise at about 68 mph at 5400 RPMs. > Attached is a pic where you can see how it looked on each side. > > Hope this helps. > > Dave Kulp > Bethlehem, PA > > On 9/14/2015 10:03 PM, Herb wrote: >> >> >> >> I built a set of new wings for my First Firefly...used 5" H sections >> as is used on the Firestar... >> >> Now I have a set of wings...built , covered and painted...and am >> wondering if anyone has built single lift struts in place of the dual >> ones? I have streamlined material to cover them with... >> >> Thinking that a cro molly tube with the same fittings as the >> Firestar would work for the fuselage end and some sort of "T" for the >> wing end...That is...the lift strut would resemble a "T" with the >> lift strut welded to a cross piece of cromolly...and a long bolt >> would go through the tangs and the cross tube on the lift strut... >> >> anyone ever seen this done? Wondering what size cro molly tube >> would be required... ? >> >> As to the Firefly..finally got some color on the wings...and next >> and last is to add some color to the fuselage..ala the Factory Paint >> job... Herb >> >> >> >> > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.