Vintage Windmill and Wind Generator Forum

Looking for 2 Dempster tail springs , one for an 8FT early #12 , and one for a 10ft #12 , or ,, are they the same ? in which cas I just need 2 of the same .
Mike B
New Braunfels TX

Mike,

Windy or someone else might have better answers, but I’d think an Aermotor vane spring would work fine.

I seem to recall my Dempster 10’ #15 vane spring is smaller than that of a 10’ Aermotor vane spring, but bigger than that of an 8’ Aermotor vane spring. The 10’ Dempster allows for some adjusting by the brake rod clevis assembly. I can measure my 10’ Dempster vane spring this evening, if no one else does. I don’t have any spare vane springs, but I do have an 8’ and 10’ Aermotor vane springs to provide a size comparison.

I sent Mike a PM. PLease measure your 10 ft spring anyway. Thanks.

thanks guy's

Couple of photos that might explain better than I did.

The red spring is for an 8’ Aermotor and is about 24” inches length.

The middle spring is what came with my 10’ #15 and is also about 24”, but the coils are more stout than the 8’ Aermotor.

The black spring is for a 10’ Aermotor and is about 30” and is closer to the coil size of the Dempster 10’.

That's a nice reference. dempster 6 and 8 ft tailsprings are one in the same. Aermotors are not. However we use 8 ft Aermotor springs for 6 ft Dempsters, they seem to furl much nicer than Dempster springs. We still like to use Dempster springs on 8 ft Dempsters. I never could figure out why a more 'easy' spring was not used on a 6 ft Dempster. The 8 ft Aermotor does it.

Thank you Michael for the photo's, a picture is worth a thousand words .
I will purchase an Aermotor 8ft spring & a 10ft spring , the professional windmillers have spoken , thanks guy's .

I have the attaching arm bracket and turnbuckle for the 10ft' , and the attachemnt bracket for the 8ft' , thank you all for the Aermotor spring suggestion .
Mike B
New Braunfels TX

interesting...

Mike, let me use my magic powers real quick... *BAM*. Now go look tucked in the angle iron of the tail vane for that 10ft.