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01-13-2009 05:19 PM  9 years agoPost 1
copperclad

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NY

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hi
i am starting on a new project , converting a Century Predator over to a 45 degree main rotor yoke , i have already tried it with a Century HBCP and a TT Mini Titan and am very happy with the results , the block of alloy i am starting with is 1" X 1.5" X 2.5" and is shown next to the stock Predator yoke , i have just started but i wanted to post a photo

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01-14-2009 01:44 AM  9 years agoPost 2
copperclad

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hi
finished boring it for the main shaft , i will start on the top end tomorrow

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01-14-2009 06:11 PM  9 years agoPost 3
copperclad

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hi
top of the yoke is ready , i just have to mill the slots for the flybar at 45 degree offset

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01-14-2009 11:36 PM  9 years agoPost 4
Fixit

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Great post Dana as always, I wondered how long it would be before you tried a big heli on 45 degree offset
How did you get to the hammer head stage? I’m guessing it went to the miller first.

Peter

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01-15-2009 12:08 AM  9 years agoPost 5
copperclad

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NY

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Hi Peter
this is the third one i've worked on , and the first two had me one the ropes , a yoke is harder to make than i thought it would be

but what i am finding out is it is not as hard as it was at first , one of the tricks is to start with a nice square piece of stock , and then i cut some waste away on the band saw , forming the "T" shape , to save the amount of material i would have to turn off on the lathe , but if the part that ends up in the jaws is good and square , it really helps the two holes come out perpendicular as they need to be

one thing that helps also , is to have a spare part to measure , and a stock head built , to look at , it also works out easier on machines that have the main rotor above the flybar

i am stoaked to see how the Predator does with this head on it , i am thinking it should be very cool to fly , and as usual it is 10 degrees here with some wind to bring it down below zero , so a good time to be in the shop , and not such a good time to be at the field , trying out the new machine , cheers

here is the part inked and ready for the flybar slot

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01-15-2009 01:10 AM  9 years agoPost 6
Fixit

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Hi Dana
Thanks for sharing the formula.
Funny but I never thought people used band saws in metal work and that’s why I thought you’d milled it first.
I would have been more than happy with the square head but now you’re profiling it as well, it looks awesome so far.

The century head looks to be in two parts, could you part it and turn the neck round?

Peter

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01-15-2009 11:38 AM  9 years agoPost 7
copperclad

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NY

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hi Peter
yes , the Century head is a composite , it has an alloy shank with a plastic piece cast around it , i was tempted to try pressing the shank out of the plastic piece and then turning a new shank , but i worried that i would be just chasing my tail , trying to save some work

Century has beefed up the NX yoke , the plastic piece is a bit bigger and i wonder is the shank has a bigger diameter too , i tend to be the overkill kid , and when i look at the Century yoke , i wonder if they are were failing from time to time , it looks pretty minimal , cheers

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01-15-2009 07:32 PM  9 years agoPost 8
copperclad

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NY

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hi
i have the head done and am very pleased , this is the third head i've made ( HBCP , TT Mini Titan ) , and with the first two i was very worried that once they were built i would have trouble hooking up the linkages without the new head interfering , with both the HBCP and the Titan i was worried over nothing , as they both linked back up fine , BUT this time Muphy raised his ugly head

the new head came out great and i was very pleased , so i install the flybar cage and flybar and have the blade grips with their mixing arms on and the more i look at it the more i see that i have big problems , so i pull off the linkages and mixing arms and look every which way of Sunday and can see i am SOL , every way you try , you have a linkage either having to go straight through the flybar , or straight through a grip , i could bend a linkage up like a pretzel and make it work but i think that is not the way to go

i have an idea and will post back if i have any luck with it , it will take another day or two

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01-17-2009 03:40 PM  9 years agoPost 9
copperclad

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NY

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i setup a new control system based on the mini titans design , here are a few photos

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01-17-2009 04:58 PM  9 years agoPost 10
Fixit

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UK

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Hi Dana
I wonder if Quick UK is watching this thread
When you start something you certainly go all the way.
Can’t wait to hear the difference it makes when it’s complete.
Great winter project

Peter

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01-17-2009 08:53 PM  9 years agoPost 11
copperclad

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NY

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hi Peter
thanks , you know how i am , jump in with both feet and don't look back , it being 10 degrees outside helps too , i have been having a good time , quite a bit of work with the 4 jaw chuck , it is fun to see it take shape , cheers

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