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Martin baker B57D Build

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Happy Days:
John Pearson, Let me get this right???…………..You decided you were going to build this model, from plan, on Tuesday, (2 days ago.) And now you’re telling us that you intend to have one side of the fuselage finished by the weekend!!! :shock:  :shock:  That is Outrageous!!

(Makes me feel totaly inadequate. :oops: )

Just as an aside,…………….. On what basis will you asses what size of fan units and motors to use if you decide to fly this as a powered model? :?:

K.

JohnPearson:
Hi keith

This model has a large wing span (good lift), therefore if i can keep the weight down, I reckon that two 70mm fans with two hot motors, should do fine. i want the model to fly at a scale speed, so this setup should provide a good thrust to weight ratio.

I will test the model on the slope first to get the CofG right and the control throws sorted, then later add the fans.

Happy Days:
Quick question………..what do you define as a “Hot Motor” :?:

JohnPearson:
HET Typhoon 2W-20 3300Kv (700W) Brushless Inrunner Motor, would be a hot motor on a 4 cell lipo

Alan_Perse:

--- Quote from: "JohnPearson" ---So far I have had one problem, after getting the fuselage formers lazer cut from lite ply according to the template provided, the formers are to short according the the plan by about 1/2", therefore I had to move the bottom span up to link with the formers. right pain in the a*!/*johnp
--- End quote ---


I know how you feel. The plan I have for the Skylark 2 is not very accurate as well. I will have to make some adjustment to the formers. I'm also redesigning the wings myself using a different aerofoil. Where did you get the parts laser cut? Did they come from Traplet?

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