Cozyflier
Well-Known Member
Hello Soaring enthusiasts,
I am new to the group and am presently building a HP-18 sailplane which is a old kit designed by Richard Schreder from the mid 70's. My plan is to complete the build per plans with a new ( more contemporary) airfoil design.
Presently the spars are completed, the new airfoil geometry is in CAD and the wing has been lofted on the computer. Wing templates and jigs to support the structure have been cut using a water jet with the new airfoil geometry.
I would like to explore a second set of wings for the project which will use a telescoping shell as in the 1970's vintage FS29 sailplane. There is little information regarding the FS29 sailplane and I am looking to see if anyone has any pictures, articles, or intimate knowledge of the operation of the retract and extension mechanism used to actuate the wings.
Any and all information would be greatly appreciated, there is little to be found on the web. The L/D numbers were quite impressive when I went from a 15 meter to a 21 meter sailplane. I can see a number of benefits from such a configuration. Greater L/D in light lift with the wing extended, greater speed between thermals with the wing retracted. More strength with a retracted wing and a doubled up spar, lower landing speeds with the wing extended, etc.
Thanks,
Chris
I am new to the group and am presently building a HP-18 sailplane which is a old kit designed by Richard Schreder from the mid 70's. My plan is to complete the build per plans with a new ( more contemporary) airfoil design.
Presently the spars are completed, the new airfoil geometry is in CAD and the wing has been lofted on the computer. Wing templates and jigs to support the structure have been cut using a water jet with the new airfoil geometry.
I would like to explore a second set of wings for the project which will use a telescoping shell as in the 1970's vintage FS29 sailplane. There is little information regarding the FS29 sailplane and I am looking to see if anyone has any pictures, articles, or intimate knowledge of the operation of the retract and extension mechanism used to actuate the wings.
Any and all information would be greatly appreciated, there is little to be found on the web. The L/D numbers were quite impressive when I went from a 15 meter to a 21 meter sailplane. I can see a number of benefits from such a configuration. Greater L/D in light lift with the wing extended, greater speed between thermals with the wing retracted. More strength with a retracted wing and a doubled up spar, lower landing speeds with the wing extended, etc.
Thanks,
Chris
