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
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | 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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | firefly behind schedule... |
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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Firefly Lift Struts |
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
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Firefly Lift Struts |
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
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|