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Old Sep 25, 2012, 07:42 AM
Do it Right, the first time!
CoolerByTheLake's Avatar
United States, MN, Hermantown
Joined Dec 2008
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C/N. What fans and motors are you using? Same as Andys?
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Old Sep 25, 2012, 08:41 AM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
21,765 Posts
no, im using jetfan 90's V2, with HET 1200's and 12s 8000. should be about 5kw per side.
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Old Sep 25, 2012, 08:43 AM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
21,765 Posts
i had to bite the bullet, and order 2 giant scale servos for the stabs. they have like 330 oz of tq each. i thought the servos i had would work for the stabs, but they ended only having 125oz of tq, and that seemed really marginal for a stab the size of my 1/8 scale F-5 wing haha. too bad these new servos weigh like 5 oz a piece! (no joke)

this thing is quickly getting heavier, now that im using 8000 cells, my weight projection has bumped to 37lbs. yikes.
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Old Sep 25, 2012, 08:50 AM
Do it Right, the first time!
CoolerByTheLake's Avatar
United States, MN, Hermantown
Joined Dec 2008
5,154 Posts
Thanks, will be looking forward to what numbers you are getting on the fan/motor combo.
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Old Sep 25, 2012, 10:31 AM
Capt. Z
falcon5's Avatar
Tonopah, Nevada
Joined Dec 2004
2,552 Posts
Quote:
Originally Posted by corsair nut View Post
i had to bite the bullet, and order 2 giant scale servos for the stabs. they have like 330 oz of tq each.
.
Yeah, me too, during my build I was going to put 125 oz tq in but ended up putting the 270 oz tq in there.

In paint next Monday..cool. As soon as you get her home you know you better get a few of pics of her posted on here or we will never forgive you
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Old Sep 25, 2012, 10:32 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
20,609 Posts
37 better start drilling holes lol.you may want some brakes on that thing.some fly in may require them once they see how big these are.
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Old Sep 25, 2012, 11:01 AM
Capt. Z
falcon5's Avatar
Tonopah, Nevada
Joined Dec 2004
2,552 Posts
Quote:
Originally Posted by AIR SALLY View Post
37 better start drilling holes lol.you may want some brakes on that thing.some fly in may require them once they see how big these are.
brakes could be good insurance as well as complying with some flyin's requirments. I bet Nut will walk her right in though In the right hands I think it will land like a butterfly,
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Old Sep 25, 2012, 11:02 AM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
21,765 Posts
yeah, no worries, ill post pics for sure. im trying to figure out if its going to fit hanging up in my garage lol.

i should be around 5kw per fan, making 10kw total, about 26lbs of thrust, and 260-270mph eflux. so, it wont have staggering vertical, but it should be pretty fast. pretty much fly just like the real one lol.

ahh....i think youll be suprized how slow it will be able to land. Andy hasnt explored heavy flap angles yet, nor has he attemped nose high power on landings. the biggest problem will come if we get east winds in vegas, coming over the brush is going to suck for landings. its going to take a agressive takeoff as well i think.
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Old Sep 25, 2012, 11:12 AM
Capt. Z
falcon5's Avatar
Tonopah, Nevada
Joined Dec 2004
2,552 Posts
Yeah was thinking about that. Also for a right to left takeoff in Vegas I will use full flaps and start the take off from the very begining of the runway. Like you say it may require a more aggressive climb angle to clear the trees.

Did a google maps plot and the east trees are 190 feet from the runway threashold. Runway looks like 750 feet long.
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Last edited by falcon5; Sep 25, 2012 at 11:23 AM.
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Old Sep 25, 2012, 11:35 AM
Capt. Z
falcon5's Avatar
Tonopah, Nevada
Joined Dec 2004
2,552 Posts
Hey Nut, looks like these guys had the same idea as us. It's Vegas north field too so they may be at the event.

With John's big planes, the two Talons and two giant B-52's..this years Vegas is going to be land of the giants.
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Old Sep 25, 2012, 12:12 PM
Registered User
unclecrash's Avatar
white lake michigan
Joined Oct 2004
3,756 Posts
Woa those are sweet. Miss the cottage up by the Wurtsmith AFB
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Old Sep 25, 2012, 02:22 PM
Official Boat Bum
Eddie P's Avatar
United States, NV, Reno
Joined Mar 2000
7,136 Posts
So at the end of the day you guys are gonna be about the same weight now, right? What about watts per pound and thrust?
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Old Sep 25, 2012, 03:16 PM
DELTAS RULE
corsair nut's Avatar
tehachapi, CA
Joined Jan 2006
21,765 Posts
well, i "should" be around 38lbs. andy is around 43-44 lbs right now.

im going to be around 10kw and some change. i hope thats going to be enough. its roughly the same watts per pound as my JHH sabre, and it was a bat out of hell, but this is a differnt ball game....the you get less thrust for watts the higher up you go in watts....i figure ill have about 25-26 lbs of thrust, with a 38 lbs weight. thats not too great. my sabre had about 9-10 lbs of thrust for 13lbs auw
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Old Sep 25, 2012, 03:27 PM
KK6MQJ
Bajora's Avatar
Joined Sep 2004
13,616 Posts
It just wouldn't be Vegas w/o you crunching to get some cool new project ready Brent!

Wish I could see you and Andy do your thing with these two giant models. Pretty amazing looking stuff here!

Quote:
Originally Posted by corsair nut View Post
get'n there. should be in paint by next monday.

down to the wire as always...
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Old Sep 25, 2012, 04:41 PM
Now in TN!
J Morgan's Avatar
Chapel Hill, TN USA
Joined Apr 2001
24,162 Posts
That's Bernie's B-52 isn't it? Not sure if he built two or someone else did one too.
Those B-52s might be challenged by that runway at the AITH event.

Nut,
Did you notice your AUW is increasing by at least a pound every time you post???

J
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