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Old Mar 19, 2012, 06:02 PM
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15Kwatt "Quad Finned Triptych" Foamy Jet.


Just started on my largest up to date project, pushing the limit and my luck. 15+ Kw foamy jet at 10' 6" x 7' span. The central 127mm EDF unit will be supported by 90mm boosters on each side running on 28S/105Volts/400+Amp current draw combined with 15-17kg thrust. Using only 6mm foam sheets and lot of C/F is going to make this build bit of a challenge I'm really looking forward to. This is not a build log, only few upgrades will be aded about my progress untill my full buid and flying reviews in RC magazines, Joe.
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Old Mar 20, 2012, 01:16 AM
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Originally Posted by jofro View Post
Just started on my largest up to date project, pushing the limit and my luck. 15+ Kw foamy jet at 10' 6" x 7' span. The central 127mm EDF unit will be supported by 90mm boosters on each side running on 28S/105Volts/400+Amp current draw combined with 15-17kg thrust. Using only 6mm foam sheets and lot of C/F is going to make this build bit of a challenge I'm really looking forward to. This is not a build log, only few upgrades will be aded about my progress untill my full buid and flying reviews in RC magazines, Joe.
Joe, that's insane!! I am really looking foreword to seeing how this ends up. You really know how to push the envelope! 100+ volts? Wicked!
Old Mar 20, 2012, 01:41 AM
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My wife thinks the same of me, but if I don't do something new, different I feel that I'm going backwards in this hobby. I.m really pushing the size limit with this one because of my work bench. 105 volts! I said, combined, 2x8-10S and 1x12S. 5-6kg in batteries but despite the weight this model will be a floater, Joe.
Old Mar 20, 2012, 02:21 AM
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My question is why only 6mm sheets? You can get 1", 2", and sometimes 4" thick 4'x8' sheets at Home Depot. You can use that as your base, then skin it with the 6mm for a smooth surface.
Old Mar 20, 2012, 06:34 PM
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My question is why only 6mm sheets? You can get 1", 2", and sometimes 4" thick 4'x8' sheets at Home Depot. You can use that as your base, then skin it with the 6mm for a smooth surface.
Hi, answer to your question, because it is the easiest and cleanest to work with. 6x6 C/F makes it perfect for laminating to get my strength. Joe.
Old Mar 22, 2012, 02:42 AM
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Working on formers to hold the power unit in place, each fan will have 50cm long thrust tube to get the optimal nperformance, Joe.
Old Mar 31, 2012, 04:54 AM
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Little progress with my foamy working out placement for 8 sets of batteries, Joe.
Old Apr 02, 2012, 05:21 PM
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The main frame almost complete, Joe.
Old Apr 03, 2012, 05:16 PM
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The first sign of life, primer and two more coats to go, Joe.
Old Apr 08, 2012, 04:05 AM
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6 more inches aded to length after installation of my quad Rudd. fins will make this model pretty good size, Joe.
Old Apr 08, 2012, 07:35 AM
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Wow!!!!
Old Apr 08, 2012, 12:44 PM
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Wow is a good comment.
Great size Jofro. Looks good hope it flies as good as it looks. Have a safe maiden.

What is the weight with 8 sets of batteries?

Regards
Larry
Old Apr 08, 2012, 07:19 PM
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Wow is a good comment.
Great size Jofro. Looks good hope it flies as good as it looks. Have a safe maiden.

What is the weight with 8 sets of batteries?

Regards
Larry
Hi, again lot heavier then originally expected! For my maiden I'll will use lighter (40cell combined) 30C/4Ah packs resulting in15kg AUW but despite, its very light w/loaded model due to its huge wing area. 2.5kg in bonding agents alone and there's no way to minimize that, 1/2kg in 8G leads and connectors not mentioning the rest so it all ads up. I believe equivalent size composite build would be twice the weight so I'm still laughing, Joe.
Old Apr 08, 2012, 07:53 PM
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at 15kw you should be able to fly ROCKS !

go for it !


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