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Old 06-05-2015, 09:52 AM   #101 (permalink)
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Quote:
Originally Posted by Johnny31297 View Post
...
Aren't they what HH put in the Blade 450X V1? I've flown a couple of those helis. Servos seemed to perform well in there
When they are reasonably fresh and new, they are enough. Now in wind, the servos are less precise.

I have heard some 250 guys say they are bang for buck for that size though, so I'm going to go try em. Cost isn't high. Dang, it's a 250 innit?

Keep calm and keep flying!
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Old 06-05-2015, 09:59 AM   #102 (permalink)
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The Oblivion is a 300+ Aligns definition of 250, which I take as common, is ~205mm blades, Oblivion runs ~250mm with extra long blade grips, resulting in about 60cm rotor diameter versus about 45cm on a 250. Quite some difference but still way smaller and not even half as heavy as a fully grown 450, so chances are it might just work as well
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Old 06-05-2015, 10:03 AM   #103 (permalink)
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E-Flite Blade 450X Flight by Bert Kammerer (4 min 2 sec)


Not extolling this servo. Just that in the right application, and in the right hands, and understanding the failure rate is important.
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Old 06-05-2015, 10:22 AM   #104 (permalink)
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Most pro pilots could make a cinderblock fly well.

Years ago I saw a guy make an unflyable Blade CP do F3C.
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Old 06-05-2015, 10:54 AM   #105 (permalink)
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Quote:
Originally Posted by Johnny31297 View Post
The Oblivion is a 300+ Aligns definition of 250, which I take as common, is ~205mm blades, Oblivion runs ~250mm with extra long blade grips, resulting in about 60cm rotor diameter versus about 45cm on a 250. Quite some difference but still way smaller and not even half as heavy as a fully grown 450, so chances are it might just work as well
I thought its much smaller, this is nearly the size of my 450! Oops, did a wrong guesstimate, this won't do for my garden. Might design my own smaller one though and see if I can make it run 210s
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Old 06-05-2015, 11:41 AM   #106 (permalink)
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Those pics might help you categorizing it a little better Forza is running EDGE 353 btw, one of the big 450s.

When did HF get an image size limit?





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Old 06-05-2015, 11:54 AM   #107 (permalink)
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Thanks! Now it doesn't look that big what blades are those?
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Old 06-05-2015, 11:59 AM   #108 (permalink)
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Quote:
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Thanks! Now it doesn't look that big what blades are those?
Those look like Lynx 245mm blades or maybe the 275mm.
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Old 06-05-2015, 12:34 PM   #109 (permalink)
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Lynx 245mm. Not too sure how I like them though
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Old 06-05-2015, 01:13 PM   #110 (permalink)
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I'd be carefull with that vbar as its right under the main shaft and any inverted crash might smash it! How much was the total cost and how much did the frame with blades cost?

I've been bombarding you with questions today!
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Old 06-05-2015, 01:15 PM   #111 (permalink)
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Lynx 245mm. Not too sure how I like them though
I liked the way the lynx 245 flew on my blade 300x when I had it. As opposed to cf blades I didn't notice much difference even with tic tics, and hard moves. That said you could also try zeal 245/255mm blades to compare.
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Old 06-05-2015, 01:37 PM   #112 (permalink)
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dedados: The VBar should be fine, the lowest bearing is capped from below and I doubt the main shaft clamp is going anywhere

About the Lynx blades: They have decent cyclic rates, collective pop is insane at high headspeeds. Didn't check on their power consumption though, only thing I know is that they generate looooots of torque. Might be due to the thick doube-reflex airfoil. My only problem is the control authority at very low rpms, cyclic gets kinda slow and collective needs eternities to bite.

I in fact did try Zeal, but.. Umm... Let me express it like this, they just don't fit the purpose of the Oblivion...
They are clearly made for Oxy 3-like rpm ranges. Cyclic and collective reach acceptable authority from like 3500rpm up, below that they are, sadly, unflyable for me.

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Old 06-05-2015, 06:44 PM   #113 (permalink)
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Totally love the concept! We can all be heli-designers now!

I'll be following this one closely and might be tempted to build one eventually(actually, I am very tempted already, but I need to patch this leaking hole in my wallet, so soon(tm)).

Cool thing about shapeways is that you can get different colors and/or materials. Part not strong enough? Get it in stainless steel! Part not bling enough? How about 18 carat gold? (Seriously, don't do that...)

I was thinking, it shouldn't be extremely hard to modify the frame to fit a specific purpose either, be it Align parts or whatnot, very interesting...

Next up a 700? Or a 1000?
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Old 06-05-2015, 07:09 PM   #114 (permalink)
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Quote:
Originally Posted by prototype3a View Post
Most pro pilots could make a cinderblock fly well.

Years ago I saw a guy make an unflyable Blade CP do F3C.
Ok, I will agree to disagree. For now. I am using the eflites as beater servos on my 250 where I believe I will have the advantage of less mass.

Could well be a terrible decision, but lol, we'll see.
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Old 06-05-2015, 08:48 PM   #115 (permalink)
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would it at all be possible run a photo compare between the Lynx and Zeal blades side by side flat, foil profile, and end pic? johnny, why would they be so different in performance I'm wondering?

Quote:
thick doube-reflex airfoil
what is that more specifically?

I think one reason the other brands are going high head speed is to get better tail authority, there's a much simpler solution to this than you think without using longer tail blades all the time.

can I suggest 4s and set the governor for 80% or something to get more torque without higher rpm? it's the new way, hv.

more vid please

btw, my avatar is my successful 6s 2200kv bl motor for my 300 no longer a blade product that's waiting for some 850mah 3s lipos to pair (or higher mah), however my 300 took a hard tumble some weeks ago and the boom clamp area was broken quite badly, 6s will have to wait 'till it gets a new frame, sure like to try one of Oblivion's.
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Old 06-06-2015, 04:56 AM   #116 (permalink)
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Would this motor work?:

http://www.rcheli-store.de/Electric-...=15304&p=15304

It has a bit less power than the scorpion one but is quite a bit cheaper too.

And this main gear?

http://www.rcheli-store.de/Blade/Spa...=15775&p=15775
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Old 06-06-2015, 07:37 AM   #117 (permalink)
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Quote:
Originally Posted by Icanfly View Post
would it at all be possible run a photo compare between the Lynx and Zeal blades side by side flat, foil profile, and end pic? johnny, why would they be so different in performance I'm wondering?

what is that more specifically?

I think one reason the other brands are going high head speed is to get better tail authority, there's a much simpler solution to this than you think without using longer tail blades all the time.

can I suggest 4s and set the governor for 80% or something to get more torque without higher rpm? it's the new way, hv.

more vid please

btw, my avatar is my successful 6s 2200kv bl motor for my 300 no longer a blade product that's waiting for some 850mah 3s lipos to pair (or higher mah), however my 300 took a hard tumble some weeks ago and the boom clamp area was broken quite badly, 6s will have to wait 'till it gets a new frame, sure like to try one of Oblivion's.
I don't have time to run a comparison photo series right now, working on an important school project. A double-reflex airfoil is a symmetrical reflex-cambered airfoil. For example, the LWK 79-100 which was used by Compass for their Warp 360 rotor blades:



Nothing speaks agains going 6s, except I didn't test that so can't say if the extra torque doesn't overload anything. Current config I'm running for a working cg is a 39g motor with a 96g battery.

Quote:
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Would this motor work?:

http://www.rcheli-store.de/Electric-...=15304&p=15304

It has a bit less power than the scorpion one but is quite a bit cheaper too.

And this main gear?

http://www.rcheli-store.de/Blade/Spa...=15775&p=15775
You can find a full parts list on the Oblivion homepage, P1 is running a Blade 300 main gear without one way bearing. For the motor: The heli was designed around the Scorpion 2208-24/2213-14 with their motor shaft modified to be able to mount the Blade 300s pinion, which has a 3mm bore hole. Dimensions are available here, you can go out and check for yourself if that motor will fit The current version of the frame utilizes the 19mm distance mounting holes as far as I see.
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Old 06-06-2015, 07:52 AM   #118 (permalink)
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curious why the Zeal's were noticeably different. Other than chord can there be that much difference? wide chord, greater stall. Tip, weight, loading, thickness drag, trailing edge (the Lynx are a sharp trailing edge? Zeal squared off glass trim)

try 4s, you'll like it, too bad batteries a harder to come by lately, 1000/1300mah 4s, because they share the same battery as a 250 quad.

thanks for the info on foil, trailing edge and chord has a lot to do with performance, a lot.
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Old 06-06-2015, 09:17 AM   #119 (permalink)
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Here's some data on both blades.

Lynx:
Blade Length: 245mm
CG from root hole: 120mm
Weight: 18g
Chord at widest point: 28mm
Profile thickness: 4mm
Tip design: Double Angled to 22mm
Profile: Double reflex camber

Zeal:
Blade Length: 250mm
CG from root hole: 130mm
Weight: 17g
Chord at widest point: 25.6mm
Profile thickness: 4mm
Tip design: Conventional
Profile: NACA0013 (?)

I assume it's the lifty double reflex airfoil, the wide chord and the further inward cg (probably due to the tip) that makes the Lynx work better.. Who knows.
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Old 06-06-2015, 09:23 AM   #120 (permalink)
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Work for school? Me too! I'm 14yrs old
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