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CarbonXtreme . Midland Helicopters . HeliProz

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e-Quick Of Japan EP-8/10/16/18 > My project
 
 
twinring
Key Veteran
Location: japan

My Posts This: Topic  Forum

Buddha,
I did many versions of this frame about 10 variations that included the area you are concerned about, and what it boiled down to is not just weight, but the amount of machining, and material used, the machinist was able to use that area of carbon from the sheet to make the battery tray. I cant really agree with Clive more on this in that yeah we can spend a lot of effort trying to make the frame bullet proof, but no matter what, something is going to break, Ive crashed about 3 sets of CF frames and some where stronger than others, the stronger ones in very bad cases transferred their damage to other parts like the the lipos, and I had one case where the frame survived, but it tweaked the boom mounts enough to crush the Gyro case. A GY401 is far more expensive than these frames. In the cases where the frame was weaker, I ended up bending some cap bolts because the shear from impact was absorbed by the bolts giving way. I think that strengthening that area would only protect in from a full on nose in the tarmac crash, and I think alot of you would agree that that type of crash usually involves a major loss of everything on board.

i think youre correct in that some reinforcement in that area could be beneficial, but since the machinist has to use another area of the sheet or another sheet altogether to make the other parts, the cost is going to go up.
09-01-2009 03:29 AM
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jimboflies
Elite Veteran
Location: Beaumont, Texas;

My Posts This: Topic  Forum
Hey budda ,

Quote 
go take a walk .


just kidding around budda.
Actualy , the battery tray is very solid and should hold up in a crash . The idea is to build the frames to fly not crash.
twinring has done an awsome job on these frames .These frames are around 4 years in the making . I`m sure twinring(Doug), has been designing these frames in his mind , and on paper for at least 4 years.
I don`t think he needs to change anything on them if you ask me ,they are perfect!!

EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9
Quick World Wide Bat 26cc gasser
09-01-2009 03:54 AM
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clive45
Veteran
Location: NSW Australia

My Posts This: Topic  Forum
OK so we have chucked this around for a while.
Have we decided with CF or G10.....who is arrangeing to get things done etc. Do we want fins with names in, would be nice but might put the cost up quite a bit.

Whats the general opinion?

He who dies with the most toys is none the less DEAD
09-01-2009 03:58 AM
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flyer09
Heliman
Location: AZ

My Posts This: Topic  Forum
I'm glad we had a chance to toss some ideas around and ask questions. It has been an interesting learning experience and fun to participate on a project with a few guys in all parts of the world.

I believe the design is really sound. The answers I've read has me very confident. Those flying the frames have nothing but praise. I really think G10 is the way to go. From a structural perspective as well as part survivability, it's like crumple zones on a car. Something's got to give. The price difference over CF might make it cost effective enough for us to get more than one or two sets each so we don't have to do this as often (or ever if twinring gets sick of us) if we want to use these frames for some time, and I do.

Twinring, once the issue of material is settled and you get the quote, can you post the cost breaks, i.e., cost if the order is for ten sets, twenty, etc. When everyone sees the cost per set they will be better able to decide on how many they would want. As for the fin, I'd like to have at least your design included, one per frame set. If you think, based on the sheet layout, we have room for a few custom fins, let me know how many and I'll send you the DXF's (or let me know which format IGES, STEP, etc.) for the ones I do.
09-01-2009 08:12 AM
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twinring
Key Veteran
Location: japan

My Posts This: Topic  Forum
if you guys really want names on your fins there will be on average a $25 setup charge for each name. If all the parts are the same, you pay the set up charge once and then keep cutting the same parts as many as you want.
09-02-2009 12:22 AM
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flyer09
Heliman
Location: AZ

My Posts This: Topic  Forum
It's probably best then not to complicate this order with custom fins. Twinring, I still hope at least your fin makes it onto the sheets of G10.
09-02-2009 02:16 AM
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clive45
Veteran
Location: NSW Australia

My Posts This: Topic  Forum
Please don't take this the wrong way, but is anything happening re the frames ....has a decision been made to go CF or G10 etc. Just checking, I know all are busy etc

He who dies with the most toys is none the less DEAD
09-11-2009 04:46 AM
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twinring
Key Veteran
Location: japan

My Posts This: Topic  Forum
Right now im waiting on quotes from two different vendors, and two different machinists.
09-22-2009 02:13 AM
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jimboflies
Elite Veteran
Location: Beaumont, Texas;

My Posts This: Topic  Forum
Thanks twinring.
You know , you are the only reason this EP8 forum is still alive. Thanks.
I will always own and fly the Quick of Japan EP8/9 helis; they have made that much of an impression on me . They are by far the best 500 size heli there is.



EP8 EX twinring frame
Quick of Japan
EP8v2 EX
EP9
Quick World Wide Bat 26cc gasser
09-22-2009 03:29 AM
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clive45
Veteran
Location: NSW Australia

My Posts This: Topic  Forum
I'm still on here. I check here every day.

He who dies with the most toys is none the less DEAD
09-22-2009 03:51 AM
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9 pages [ <<    <     7      8     ( 9 )    >    >> ]4098 viewsPOST REPLY
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e-Quick Of Japan EP-8/10/16/18 > My project
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