AncientAviation
Well-Known Member
Greetings all...
I am building a Mitchell wing B10 in the UK under the SSDR rules - similar to the 103 in the USA.
I am looking to make a (slightly) different cage structure for two main reasons:
a) the plans cage is too small for my delicate 6'4" frame
b) locally I can get some ali at a very reasonabe cost - if we have to import as per the plans it will push up costs a huge amount.
I'd like to know if I am missing something or if there is any issues with my plan
The B&W photo shows the plans cage.
It uses 1_1/2" tubing for the bottom floor tubes, the rear upright tubes and the rear landing gear tube.
The rest are 1" tubes of various wall thicknesses.
The colour photo is one I found that has extra head room and the diagonals attach at the top of the front uprights as opposed to c. 70% up the upright.
I'll need to ensure the wheels are in the same place relative to the wing.
Not sure if the wheels need to be moved a bit back by virtue of the extra height?
I have some 1", 1_1/8" and 1_1/4" 17 guage (0.056") tubing that will all sleave nicely with each other apparently...
I plan to use 1_1/4" throughout with extra sleeving at ends/bolts and full sleeve where the plans called for thicker wall tube such as the front upright
Using 1_1/4" instead of 1" will add some weight.
Extra head room will also extra tubing and thus extra weight.
Using it instead of 1_1/2" will save weight (not a lot of 1_1/2" tubing is used!) but I wonder about the strength if using a smaller diameter tube?
Extra head room i.e. extra length tube, probably means might need a possibly thicker tube wall than original plan specs (where the tube is shorter).
It is only a few inches extra headroom so maybe not significant but a factor
So....
What am I missing please?
Any issues or other things I need to be aware of?
My thanks
I am building a Mitchell wing B10 in the UK under the SSDR rules - similar to the 103 in the USA.
I am looking to make a (slightly) different cage structure for two main reasons:
a) the plans cage is too small for my delicate 6'4" frame
b) locally I can get some ali at a very reasonabe cost - if we have to import as per the plans it will push up costs a huge amount.
I'd like to know if I am missing something or if there is any issues with my plan
The B&W photo shows the plans cage.
It uses 1_1/2" tubing for the bottom floor tubes, the rear upright tubes and the rear landing gear tube.
The rest are 1" tubes of various wall thicknesses.
The colour photo is one I found that has extra head room and the diagonals attach at the top of the front uprights as opposed to c. 70% up the upright.
I'll need to ensure the wheels are in the same place relative to the wing.
Not sure if the wheels need to be moved a bit back by virtue of the extra height?
I have some 1", 1_1/8" and 1_1/4" 17 guage (0.056") tubing that will all sleave nicely with each other apparently...
I plan to use 1_1/4" throughout with extra sleeving at ends/bolts and full sleeve where the plans called for thicker wall tube such as the front upright
Using 1_1/4" instead of 1" will add some weight.
Extra head room will also extra tubing and thus extra weight.
Using it instead of 1_1/2" will save weight (not a lot of 1_1/2" tubing is used!) but I wonder about the strength if using a smaller diameter tube?
Extra head room i.e. extra length tube, probably means might need a possibly thicker tube wall than original plan specs (where the tube is shorter).
It is only a few inches extra headroom so maybe not significant but a factor
So....
What am I missing please?
Any issues or other things I need to be aware of?
My thanks
