HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old May 01, 2012, 10:31 PM
Registered User
United States, TX, Grand Prairie
Joined Nov 2005
5,675 Posts
Quote:
Originally Posted by THESANDMAN View Post
i want to know level flight .if you recalled it was a touch n go all i lost was the front wheel and if it wasnt cause i picked up debree which fractured one of the blades i would have done another lap , gotta give me credit i made half a lap and then dead sticked in the small runway .saving the jet from being part of the trees or in your case strained thru the trees
come to think of it i officially hold the fastest touch n go on a jet at the field
IINM around 4-5 lbs gets many 70mm sized aircraft in the 80s - 90s shallow dives depending on weight.
erh7771 is online now Find More Posts by erh7771
Reply With Quote
Sign up now
to remove ads between posts
Old May 02, 2012, 01:13 AM
Registered User
Joined Aug 2009
55 Posts
91-ZULU is online now Find More Posts by 91-ZULU
Reply With Quote
Old May 02, 2012, 05:56 AM
Guarantee at least one landing
Burdo's Avatar
Australia, QLD, Mooloolaba
Joined Aug 2007
316 Posts
Quote:
Originally Posted by The_RattleSnake View Post
I should have posted this here sooner!

I made a video of the stock fan from my F22 70mm and put it up against the
CS 10blade for what i think is a very good comparison for the difference
in sound the CS 10 blade gives.

So much better!

http://www.youtube.com/watch?v=qvWGDk1htjw
WOW, that really says it all....
Burdo is offline Find More Posts by Burdo
Reply With Quote
Old May 02, 2012, 07:03 AM
Kamikaze Ace
Glacier Girl's Avatar
USA, FL, Lakeland
Joined Jan 2010
2,355 Posts
Erh, from what I gathered end of May is release date on the 262.

And speaking of 262's I found the problem in mine as to why it would run on 4S but not 5S on one side. And it wasn't pretty. How about the "good" esc delivering 16.32 volts through the red wire to the rx when hooked up. And this is an opto esc.

It fried the other esc's lead, and also took out the rx, servos, bec, and retract controller.
Motors and retract somehow managed to survive.

Boy I hope the end of May comes soon.
Glacier Girl is offline Find More Posts by Glacier Girl
Reply With Quote
Old May 02, 2012, 04:57 PM
no more glow models for me!!!!
iflyrc1012's Avatar
bklyn n.y.
Joined Jan 2008
881 Posts
i just finished what i thought was my dream plane The Skyraider AD-1......
now some jackazz goes and puts out an ME-262, and it takes twin 70mm fans...
does anyone know the w/s? what it's made outta? rec ready? or will it be available
as a kit? no electronics??? huh?huh?huh? i'm going to look for a thread(if there is one)
how am i gonna get another commission check to pay for it?? I'm calling in all chips for this plane... if you owe me,look out i'm looking to collect. if i owe you, try to find me!!!!
iflyrc1012 is offline Find More Posts by iflyrc1012
Reply With Quote
Old May 02, 2012, 05:50 PM
Registered User
Australia, VIC, Melbourne
Joined Nov 2006
10,406 Posts
I didn't like the Me-262 pics.... it didn't look right in scale terms. But they are probably lousy pics and angless anyway. I would want to see more, and better, pics. But it is an awesome aircraft subject to model off.
PeterVRC is online now Find More Posts by PeterVRC
RCG Plus Member
Old May 02, 2012, 05:55 PM
Registered User
THESANDMAN's Avatar
United States, NY, New York
Joined Oct 2010
1,620 Posts
Quote:
Originally Posted by iflyrc1012 View Post
i just finished what i thought was my dream plane The Skyraider AD-1......
now some jackazz goes and puts out an ME-262, and it takes twin 70mm fans...
does anyone know the w/s? what it's made outta? rec ready? or will it be available
as a kit? no electronics??? huh?huh?huh? i'm going to look for a thread(if there is one)
how am i gonna get another commission check to pay for it?? I'm calling in all chips for this plane... if you owe me,look out i'm looking to collect. if i owe you, try to find me!!!!
we where talking about it at the field on Sat remember
(oooh wait you was a no show )Features
1500mm wingspan!
2 x 70mm EDF drive
The perfect look
Retracts
Specifications

Wingspan: 1500mm
Length: 1284mm
Servos: 5pcs. 9g servo
Drive: 2 x 70mm EDF
Engines: 2x 3500KV Outrunner Brushless
Controls: 2 x 60A Brushless ESC
Battery: 4S 14.8V 4000mAh 25C LiPo

well here are the spec
THESANDMAN is offline Find More Posts by THESANDMAN
Reply With Quote
Old May 02, 2012, 06:00 PM
It should fly at least once
clive45's Avatar
Australia, NSW, Grenfell
Joined Mar 2006
2,557 Posts
Wingspan: 1500mm
Length: 1284mm
Servos: 5pcs. 9g servo
Drive: 2 x 70mm EDF
Engines: 2x 3500KV Outrunner Brushless
Controls: 2 x 60A Brushless ESC
Battery: 4S 14.8V 4000mAh 25C LiPo

well here are the spec[/QUOTE]

Are you sure about the motor KV, seems a bit high....54000RPM
clive45 is offline Find More Posts by clive45
Reply With Quote
Old May 02, 2012, 06:15 PM
Extreme CNC Alloy EDF
Extreme_RC's Avatar
Australia
Joined Mar 2006
11,454 Posts
If it has regular 5 blade fans in it then 3500Kv is about right for a 4 cell setup pulling 50-55 amps.
Extreme_RC is offline Find More Posts by Extreme_RC
Reply With Quote
Old May 02, 2012, 06:41 PM
Registered User
Australia, VIC, Melbourne
Joined Nov 2006
10,406 Posts
You can pretty well take off 10% RPM from the theoretical number for a start. And then a bit more tolerance for various aircraft's ducting systems. So I would guesstimate/expect 46k to 48k RPM area from 4S 3500KV.

There are actually a bunch of factors that come into play in the final outcome.
KV doesn't actually tell you what the motor WILL do in any given load situation. A weaker made 'cheapie' will not be able to drive the load to the KV RPM. (And you can bet this won't have overly great motors.). Even a HET or ARC won't - but they will do better.
Then you have what happens (not precisely known in advance) to the result for various levels of 'overloading' the motor. Say you expected the fan was best suited to 2800kv for 4S (maybe because someone told you they did that), but then tried 3300kv (technically likely to be overloaded) and then 3800kv (way overloaded). You could still find the 3800kv still gives the most thrust, least Amps, but only drives it to 80% of its theoretical RPM due to the large overload level. That can be just because that particular motor's design factors managed to get it to achieve that seemingly odd result in that load situation. (I have had that happen).

So the bottom line is that you can't rely on the theory too much at all. Because theory requires you to have ALL the facts. And we never have all of those. Every detail, from wiring style, metal types, magnet strengths, measurements, weights (eg bell weight/mass)... and who knows how many more fine details.
Our only way is to TEST IN SITU.
And that means testing THAT motor, in THAT fan... and in the end, in THAT aircraft.
The theoretical part is just an advance rough guide.... and a guide that often can end up having been miles amiss too!
PeterVRC is online now Find More Posts by PeterVRC
RCG Plus Member
Old May 02, 2012, 06:47 PM
It should fly at least once
clive45's Avatar
Australia, NSW, Grenfell
Joined Mar 2006
2,557 Posts
I was just automatically assuming CS70-10................

Its cold and I need to put my beanie on too warm up my brain it catches us old fellas out all the time.
clive45 is offline Find More Posts by clive45
Reply With Quote
Old May 02, 2012, 07:03 PM
Registered User
Australia, VIC, Melbourne
Joined Nov 2006
10,406 Posts
Which reminds me of some test results to add.
Except these are only from in-plane (the Freewing Su-35).

L2855-2100kv on 6S 5800mAH 30C (Turnigy junk)
(videoed)
1.35Kg thrust peak (60A 1345W 22.2V)
1.30Kg (or a fraction less) stabilised at 57Amps 1235Watts 21.8V

Versus the Freewing Stock (Gold) 2300kv motor in a CS10 (other engine side)
(Not videoed, damn. Will sometime soon)
1.45Kg thrust peak at 58 Amps
1.30Kg stabilised at 55 Amps

To get more thrust, you need more RPM. So the 2300kv obviously could achieve that, in this load situation. That does not mean just because it was 2300kv instead of 2100kv, it is just what all the factors of the Freewing motor added up to in this case, versus what the L2855 could achieve in this case. And note the FW motor used less Amps to achieve that too!
And that does not mean that an L2855-2300kv would do the same as the Freewing. It might do worse (it should as it looks to be a weaker/smaller motor), but it might do better too. Only a test can tell and prove that.
So that is the next test for me to do..... I am thinking it will match the FW thrust result, but at even higher Amps than the 2100kv.

The L2855 smelt as it ran..... the FW2300kv seemed to cope easily (no smell).
Whether that was the L2855 burning its oil, or the windings coating (shellac?) burning-in, I don't know. But for the moment the L2855 seems that it was over-stressed for this job. Who knows how long it would truly last.

My 5S L2855-2300kv in my Meteor would be 20+ flights now at least, and seems (sounds etc) totally fine so far. That is a bit lower stress (5S 2300kv, versus 6S 2100kv) but not too far apart.

I am also getting an XK2850-B-2060KV (inrunner, Leopard really, sort of HET like) to test. And I am also close to giving in to HET and buying one so I can test one of those as a reference too.
PeterVRC is online now Find More Posts by PeterVRC
RCG Plus Member
Old May 02, 2012, 09:23 PM
Registered User
Tamjets's Avatar
San Jose, CA
Joined Jun 2006
5,453 Posts
The got first 10 x 5mm shaft done.
Be up tonight online store.
Tamjets is offline Find More Posts by Tamjets
Reply With Quote
Old May 02, 2012, 10:11 PM
crashing build's character.
United States, AL, Dora
Joined Mar 2008
516 Posts
Quote:
Originally Posted by Tamjets View Post
The got first 10 x 5mm shaft done.
Be up tonight online store.
hey i look on your site i cannot find it? and this is the shaft that fits the cs 10 blade fan. it fits the 32 eflite motor 2150kv.
onefastxp is online now Find More Posts by onefastxp
Reply With Quote
Old May 02, 2012, 10:48 PM
Registered User
Tamjets's Avatar
San Jose, CA
Joined Jun 2006
5,453 Posts
Quote:
Originally Posted by onefastxp View Post
hey i look on your site i cannot find it? and this is the shaft that fits the cs 10 blade fan. it fits the 32 eflite motor 2150kv.
It will be on tonight after coming from dinner.
Tamjets is offline Find More Posts by Tamjets
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
New Product Change Sun 12 blade 90mm Flip Flop Electric Ducted Fan Jet Talk 7070 Jun 27, 2014 07:21 AM
New Product Change Sun 120mm and new 10 blade 70mm fans Flip Flop Electric Ducted Fan Jet Talk 131 Apr 27, 2012 07:07 PM
Sold Change Sun electric retracts Flip Flop Aircraft - Electric - Jets (FS/W) 3 May 23, 2011 06:20 AM
Sold Change Sun Electronic retracts w/Lander struts hole digger Aircraft - Electric - Jets (FS/W) 2 May 06, 2011 01:27 PM
Sold Change Sun Electric retracts NIB 75.00 jzuniga Aircraft - Electric - Jets (FS/W) 2 Sep 03, 2010 09:36 AM