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Old Apr 24, 2009, 01:27 AM
Fly it like you stole it..
Tram's Avatar
Florence, Al
Joined Oct 2000
29,298 Posts
Lots of ways to read the setup..

My favorite is www.eagletreesystems.com and their eLogger.
Second would have to be a simple wattmeter - something like the AstroFlight 101, Bantam Two-Meter and others..

If you have a 480g airplane and you produce 480g of thrust, you'll have a nicely powered aircraft.. Usually for speedy type aircraft you want 150watts/lb or somewhere around in there..


Jeff
www.CommonSenseRC.com
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Old Apr 24, 2009, 09:26 AM
Fear is the mind killer
BustedBlades's Avatar
United States, LA, Lafayette
Joined Dec 2008
1,245 Posts
Quote:
Originally Posted by uniquexme
i have this 2836-2350KV but rcgroup tested its 2800Kv, i wonder whats the best prop for 2200mah 3S1P 20C lipo with 40A ESC on this bird to make it go super fast!!!!!!
I'm using the 2836-3200KV version running a 4.75x4.75 APC E on a turnigy 40A with a 2200-20C.
It's so stupid fast I don't open it up. I only fly for about 4 minutes at a time in fear of fire because it obviously pulls more than 40A.
When I just first got the motor, I flew 5 times before 3 of the magnets came unglued from the can and shoved to one side. I glued them back in place and now it works fine. Its a screamer.
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Old Apr 24, 2009, 10:02 AM
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Malaysia
Joined Apr 2006
466 Posts
bird, where is the CG of this plane? i just finished building!! got to maiden tomorrow. haha.... hope the wing doesn't get stuck. muhaha...
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Old Apr 24, 2009, 11:40 AM
CNC Cutter
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United States, IN, Indianapolis
Joined Dec 2005
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CG ?
http://www.rcgroups.com/forums/showp...&postcount=404

What to do with numbers ?

Well, it's a matter of "the chain is only as strong as the weakest link".

IF the Lipo is a 30C type and the ESC is rated above the MAX amps pulled
then motor heat is the thing to watch.

If the Motor is loafing then you you can UP the prop size.

If the ESC is getting too hot then you have to go smaller on Motor or Prop

If the Lipos is a lesser type and getting too hot then down size the prop.

You're just trying to maximize your thrust without ruining equipment.

Surely, that motor will put out way more than 500g thrust
The spec says 800g thrust but that doesnt quite sound right
considering the 480 watt rating.
( What Tram said above )

You AUW is under 16 oz ( 413 g )
and that motor is good for more that 4X power to weight. ( based on watts )
Or 2X based on the spec'd thrust.

So it'll either be ...

All ahead Warp Factor 2
or
All ahead Warp Factor 4 ... Engage ! ( lets go stupid fast per bustedblades above )

Now Pitch speed is another thing.
The Prop Number is DiameterxPitch
Pitch is the theoretical number of inches the prop will move forward Per Rev.
So Mph or Kph is a rather messy formula.
I have a spread sheet to do that .

There was a discussion somewhere in RCG re recording the Sound
of a Flyby and knowing the pitch they could calc the Speed.

It was supposed to be better and cheaper than a Radar Gun.

I base my flying on Fun Factor.
Check your own SMILE-O-Meter for those readings! :-)
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Last edited by birdofplay; Apr 24, 2009 at 12:02 PM.
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Old Apr 24, 2009, 12:03 PM
Registered User
Ipoh, Perak Malaysia
Joined Jul 2006
3,987 Posts
If you are talking Trekkie, the warp factor is wf^3. So, warp factor (wf) of 2 = 2^ 3 = 8 times the speed of light. A warp factor of 4 is 4^3 = 64 x speed of light.

chewy
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Old Apr 24, 2009, 12:08 PM
CNC Cutter
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United States, IN, Indianapolis
Joined Dec 2005
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SMILE-O-Meter reading = 8 :>}}}}}}}}
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Old Apr 24, 2009, 12:57 PM
Registered User
Winnipeg, Canada
Joined Apr 2007
1,497 Posts
Quote:
Originally Posted by G550Ted
Go to birdofprey's web site http://www.balsabuddies.com/

$40 for foam kit, $44 for full kit.

HTH,

Ted
Hey guys i discovered this thread last night and spent a couple of hours reading and when I got to page 35 I decided to skip to the end and I finally found where to order! Submitted the payment this morning to Birdofprey so hopefully will get mine soon.

Quick question, in the first few pages there was a version 1 and a version 2. The kit is the version 2 or has been there other improves since then?

Thanks!
E
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Old Apr 24, 2009, 03:22 PM
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United States, IN, Indianapolis
Joined Dec 2005
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Wheew , I cant even remember but I'm pretty sure I'm doing the latest version.
2007 ... remember back then .. The Good Ol Days :-))) sigh .................

Got your post, and PM

Thaks for the order ;-)

Bob
http://www.balsabuddies.com/cutouts/index.htm

Theres a DL'dable manual in here someplace also.

L8r
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Old Apr 24, 2009, 07:04 PM
Long time newbie
USA, TX, Katy
Joined Nov 2006
976 Posts
Quote:
Originally Posted by birdofplay
Wheew , I cant even remember but I'm pretty sure I'm doing the latest version.
2007 ... remember back then .. The Good Ol Days :-))) sigh .................

Got your post, and PM

Thaks for the order ;-)

Bob
http://www.balsabuddies.com/cutouts/index.htm

Theres a DL'dable manual in here someplace also.

L8r
build manual http://www.rcgroups.com/forums/showt...37#post8989037
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Old Apr 24, 2009, 09:11 PM
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Malaysia
Joined Apr 2006
466 Posts
bird, do u find the rear pc behind the prop, in front of the elevon is rather weak? i intend to attach a CF tube on top of it, but was afraid that the airflow might not be smooth, so i end up attaching some fiber tape on top and bottom. haha.... just to be safe... if i knew its so flexy, i would have cut a groove and attach a CF tube just like the wing, and the top pc.

hope i can maiden successfully w.o crashing... i love this plane.... one thing i worried is that i used the thinner piano wire, i was afraid it might not be able to withstand my motor torque... have to remind myself to sweep the wings when up in air. haha.... can't wait to fly this thing.
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Old Apr 24, 2009, 09:23 PM
Have Fun! Land, Sea or Air
jetcaptain's Avatar
United States, TX, Austin
Joined Jul 2006
1,354 Posts
Quote:
Originally Posted by uniquexme
bird, do u find the rear pc behind the prop, in front of the elevon is rather weak? i intend to attach a CF tube on top of it, but was afraid that the airflow might not be smooth, so i end up attaching some fiber tape on top and bottom. haha.... just to be safe... if i knew its so flexy, i would have cut a groove and attach a CF tube just like the wing, and the top pc.

hope i can maiden successfully w.o crashing... i love this plane.... one thing i worried is that i used the thinner piano wire, i was afraid it might not be able to withstand my motor torque... have to remind myself to sweep the wings when up in air. haha.... can't wait to fly this thing.
Good Luck on your maiden flight!
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Old Apr 24, 2009, 10:03 PM
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uniquexme's Avatar
Malaysia
Joined Apr 2006
466 Posts
guys, i think i click unsubscribe to this thread some time ago, then now when i go into control panel, show instant email notification, it doesnt notify now when there is new reply... any help?

never mind, i figured it out...
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Old Apr 25, 2009, 02:52 AM
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Malaysia
Joined Apr 2006
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all done, ready for maiden in another hour. haha.... here she is. AUW 615g with 2200mah 3S1P 20C Lipo.













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Old Apr 25, 2009, 07:27 AM
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Malaysia
Joined Apr 2006
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guys, maiden ok... CG perfect after some adjustment. BUT the wings can't open in air! so when u open when launching, sometimes it will sweep back, but most of the time, it got stuck and only sweep when it like. haha... but i tried doing rolls with wing sweep, damn, its like a drill... and with wings open, its like flying a high wing plane, takes such a long time to make a roll. haha... nice...

oh, as expected this prop is not suitable. i lower to 6x3, but still hot, ESC is hotter than motor... maybe i try my frenz 5x5 tomorrow. but just now i tried using 4.75x4.75, didn't fly it, but there is barely thrust to push the plane...

i think my wing problem with sweep.... but i was thinking if 65MG is not strong enough to open in flight? even if i cut throttle, its unable to open, but on land, it open and close nicely... or maybe the piano wire i used is too small?
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Old Apr 25, 2009, 09:12 AM
Have Fun! Land, Sea or Air
jetcaptain's Avatar
United States, TX, Austin
Joined Jul 2006
1,354 Posts
Very nice looking F-14. Great job on getting it ready to fly so quick. I am still working on the wing mechanics.
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