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Thrust Line
Hello All,
I am completing a Bud Nosen Citabria my father started about 15 years ago. With today's engines, fuel choices, and power applications, the opportunities are limitless as to what "CAN" be done and what I wish to do. ~cutting to the chase~ I wish to put a 30cc gasser on the aircraft. Albeit, in order to use the aforementioned engine, thecenterline of engine will place the prop shaft at 1/4" above the thrustline of the plans in order to mount the engine within the cowling and aligning the propshaft cut out. My delima: How catastrophic would this be? The plans also call for (0) zero degree down and/or (0)zero degreeright thrust. Thank you for your time, Scott |
RE: Thrust Line
I doubt that it will make a measurable difference in flight characteristics.
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RE: Thrust Line
ORIGINAL: trooper-rat in order to use the aforementioned engine, the centerline of engine will place the prop shaft at 1/4'' above the thrustline of the plans in order to mount the engine within the cowling and aligning the propshaft cut out. The prop shaft of the engine decides where the engine is mounted. If the prop shaft is 1/4" too high, mount the engine 1/4" lower. Whatever............ 1/4" higher or lower won't cause any aero problems. Might not show anything at all. |
RE: Thrust Line
ORIGINAL: trooper-rat Hello All, I am completing a Bud Nosen Citabria my father started about 15 years ago. With today's engines, fuel choices, and power applications, the opportunities are limitless as to what ''CAN'' be done and what I wish to do. ~cutting to the chase~ I wish to put a 30cc gasser on the aircraft. Albeit, in order to use the aforementioned engine, the centerline of engine will place the prop shaft at 1/4'' above the thrustline of the plans in order to mount the engine within the cowling and aligning the propshaft cut out. My delima: How catastrophic would this be? The plans also call for (0) zero degree down and/or (0) zero degree right thrust. Thank you for your time, Scott On more thoroughbred low winged aerobats at around 1.2 size, 1/4" higher thrust vector will in essence result in a lower wing position relative to thrust, meaning you would likely get a little adverse roll coupling with applied rudder for the given dihedral. Your Citabria should not exhibit much change with any command MattK |
RE: Thrust Line
Thanks everyone for your input. I didn't think the thrustline would be too serious, but I wanted to hear it from others to enforce my decision to continue with the engine choice.
I apprieciate these forums andits members more and more daily!! |
RE: Thrust Line
ORIGINAL: trooper-rat Thanks everyone for your input. I didn't think the thrustline would be too serious, but I wanted to hear it from others to enforce my decision to continue with the engine choice. I apprieciate these forums and its members more and more daily!! Of all th basic settings this one is most tolerant of it's placement or angle Why? the speed of the airframe (the models) dictates the actual angle of wing, stab and thrust. so any setting is a moving target Where thrust lines really get fussy are setups where the engine is very high above (or far below)the vertical center of drag. The reason is pretty obvious - the force (thrust is working on a longer moment arm |
RE: Thrust Line
The thrust line on this kit runs from F1 through the fuse to the exact corner of the empenage at the base of the vertical fin (mounting point of the tail wheel). Again, this will only raise that line about a 1/4" through the entire fuse without any change inlength on the plans. This is not being built as a airbatic (citabria) aircraft. I will be flying this bird in its the most docile regime due to its importance and scale. authenticity.
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