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Scale Model RC Helicopters > Approach Engineering eCobra / Swift 16 Build
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

Muddle away...I like to see photos and settings on other machines.

I am still awaiting some flybar parts for my 620SE. So the project is still in standby mode. Not going flybarless until the Apache project early in 2009.

I agree with oldfart, never had a problem turning 1900-2100 on any Swift and never saw the need to upgrade to the metal parts. However, that being said, I do have a NEW Swift 16 and....well, I'll just say that I am only going to use the 620Se mechs from now on.

The 620 has the triple ball bearing tail hub and grips, push/pull on the elevator as well as ball bearings everywhere. It also has a better flybar and head as well as metal swash, solid main shaft, triple bb main shaft support, etc. I do not like the metal grips though.

I am particularly interested in the SK360 settings because I have a 4-blade 620SE (10S) slated for the Apache project (still don't know what head and what blades though). Also, please post some eLogger data if you have it.

I'll hopefully resume building this week. Until them I'm working on the honey do list.

Patrick
O|||||||O H2 Recovery Team
11-30-2008 01:51 PM
HOMEPAGE  
 
 
patsyw26
New Heliman
Location: Norman, Oklahoma

AE eCobra

Does anyone know the scale size of the eCobra from AE that is about 52 inches in length?

And has anyone made a cockpit to fit it or know where we can get one?



patsy elders
11-30-2008 11:12 PM
 
 
Dr.Tim
Key Veteran
Location: Mojave Desert

The scale is aprox 1/12th, Cockpit pictures that you can print and apply to wood are to size on the included CD, as well as many photo's of fullsize Cobras. Basically a wood floor with the instrument panels (On the CD) some construction paper for the Instrument panel shields and 2 - 6" pilots (Have to cutt thier legs off though!) will make a nice cockpit. Keep it simple and fun!!

Dr.Tim

From Simple minds come simple ideas! Starwood Models, Approach Engineering
11-30-2008 11:22 PM
HOMEPAGE  
 
 
Heli 770
Elite Veteran
Location: Lemon Grove, Ca. USA.

patsyw26
Welcome to Run Ryder. I know you're not getting all of this info. only for your self, but also helping someone else in the process. I think that is very admirable, Good Luck in your Quest.
11-30-2008 11:37 PM
 
 
WrenFlyer
Heliman
Location: Aberdeen, MS USA

Since there are good many people watching this thread, I thought I would share some power system results for the Swift. I've dialed it down to 1470 HS and the results are good. This in theory should allow a 14 minute flight time on a 6S 5000 pack. Also the video of the flight that we have the data on. http://www.vimeo.com/2388917

11-30-2008 11:48 PM
 
 
WrenFlyer
Heliman
Location: Aberdeen, MS USA

Quote 
The scale is aprox 1/12th, Cockpit pictures that you can print and apply to wood are to size on the included CD, as well as many photo's of fullsize Cobras. Basically a wood floor with the instrument panels (On the CD) some construction paper for the Instrument panel shields and 2 - 6" pilots (Have to cutt thier legs off though!) will make a nice cockpit. Keep it simple and fun!!

Dr.Tim

I haven't looked at my CD...so I didn't know that info was on there!

Thanks Dr. Tim!

BTW, I have a build thread over on RCGroups some more Swift 16 build and set up information. http://www.rcgroups.com/forums/showthread.php?t=960524
11-30-2008 11:52 PM
 
 
Hoverup
Elite Veteran
Location: Gulf Coast

Alan - Great flight video. What was all the switch flipping on the sound track about?

Cheers - Boyd
AMA80393
IRCHA 3355
Major USAF
Retired
11-30-2008 11:59 PM
 
 
WrenFlyer
Heliman
Location: Aberdeen, MS USA

Quote 
Alan - Great flight video. What was all the switch flipping on the sound track about?

That was my son using a cheap tripod that was creaking as he moved it. After I asked him not to use the tripod.

Did you check my other vimeo vids? I like Vimeo 10 times better than you tube.
12-01-2008 12:09 AM
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

Awsome video Allen

Patrick
O|||||||O H2 Recovery Team
12-01-2008 01:16 AM
HOMEPAGE  
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

Helicopter parts arrived today, so it's back to work on the Snake!

Got some semi-scale openings done today with brass wire mesh installed.





If all goes well this week, first flight should be Mon or Tues.

Patrick
O|||||||O H2 Recovery Team
12-04-2008 12:42 AM
HOMEPAGE  
 
 
oldfart
Elite Veteran
Location: Vancouver, Canada

Looking forwrd to it Seaviper
12-04-2008 01:15 AM
 
 
marked23
Key Veteran
Location: Lynnwood, WA

WrenFlyer,
For the slow head speed, are you using a smaller pinion or just dialing down the throttle curve?

I ask because I wonder if anyone has done an efficiency comparison (flight time) between lowering the throttle vs. lowering the gearing for the same setup.

From stuff I've read about the efficiency of brushless controllers, I suspect that the lower gearing might be the more efficient route. I haven't seen it specifically discussed, so I don't know for sure.
12-04-2008 01:31 AM
 
 
WrenFlyer
Heliman
Location: Aberdeen, MS USA

I've found that for a motor/ESC combination to be most efficient, you need to run at least 75-80% power. In most cases you'll want to run a low kv motor with a small pinion. I run in governor mode with all of mine. After you dial in your HS pretty close, it's a matter of moving it up and down while checking amp draw so you can find that "sweet spot". A data logger is worth it's weight in gold for this.
12-04-2008 01:50 AM
 
 
Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

FWIW...regarding the plastic head on the swift "exploding"

These stories were under either extreme cold conditions and or extreme 3d ringer type guys. Otherwise I would not worry about it.

Also, using 6 cells to run less than 1600rpm head speed sound like one cell too many. You can achieve same head speeds with only 5S.

Still enjoying this build...keep'em coming!

<><>...the lunatic is in my head...<><>
12-04-2008 01:11 PM
HOMEPAGE  
 
 
WrenFlyer
Heliman
Location: Aberdeen, MS USA

Quote 
Also, using 6 cells to run less than 1600rpm head speed sound like one cell too many. You can achieve same head speeds with only 5S.

Yes, you could do it with 5 cells. I have 4 6 cell batteries to use though. And for the same ma pack, you'll still get longer flight times on 6S. I managed a 14 minute flight a couple of days ago!

12-04-2008 01:25 PM
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

I'll post some data for the Swift 620SE this week hopefully.

Got the head built today. Swift 620SE mechs, plastic grips.



Here is some data from another stock Swift 16, Flight Power 5S 5350, Electron 80 ESC, Century 600 A+ 1100kv motor, 9 tooth pinion turning Funkey 550's. Flat 90% throttle curve.

Outside air temp was about 77F

Temp A = motor
Temp B = ESC
Temp C = battery



Although this graph does not show it clearly, the rotor blade RPM was around 1740 RPM for most of the flight. The GY401 never lagged with only low to moderate gain settings. I'm sorry but I have forgotten the exact gain settings. More info when I get my current ships in the air.

The Cobra will use a Flight Power 5S1P 5000 since I have two of these already. The Apache will use a 10S config.

Patrick
O|||||||O H2 Recovery Team
12-04-2008 03:01 PM
HOMEPAGE  
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

Didn't like the vent openings I made, so I am re-skinning that area.



Full on into mech construction. Got the head, flybar, and mast components done.



Looks like I am going to have to dremel out a couple slots on the elevator servo mount in order to clear the mounting post.



Patrick
O|||||||O H2 Recovery Team
12-05-2008 02:45 PM
HOMEPAGE  
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

Test fit the mechs into the Cobra and all looks well. Plenty of room for the 5S1P 5000. (sorry for the blurry photo) The 620Se frames fit quite nicely. Haven't yet looked at hooking up the TR pushrod.



Mechs should be finished tomorrow. I will fly the mechs separately from the fuselage for several test flights before mating the two.I plan on flying the mechs on Monday. eLogger V3 data will be posted then too.



The 620Se kit was missing the bearings for the two ccpm bellcranks. Luckily I have a few spares around. Overall, I like the 620SE so far. I can't believe I almost sold it

Patrick
O|||||||O H2 Recovery Team
12-07-2008 03:42 AM
HOMEPAGE  
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

Little more work on the mechanics. Had a couple other small parts issues. Luckily I scavenged up some replacements from another kit.
I have another 620Se on order ( yes I hit the 20% Monday sale ), so I hope the new one doesn't have the same parts issues. Nothing major, just delays the build.



If time permits, photos of the completed mechanics should be available later today.

I think the 620SE is what the Swift should have been all along. Century just has to get a handle on some small QC issues.

Patrick
O|||||||O H2 Recovery Team
12-08-2008 01:17 PM
HOMEPAGE  
 
 
Seaviper
Senior Heliman
Location: Ft Lauderdale

Pretty much finished mechanics building today. Had another small parts issue, but luckily I had a spare.

Talked to Century today about my 620Se on order and they said the kits were being inspected. That's good.



I use Neu 4mm gold connectors on all power cables. I also use them on the RX batt charge leads so I don't have to go fishing for adapters in the field. I use Flight Power batts and only use 80% max on any given flight, but I like a separate power system on the flight controls none the less. Call it personal preference.

Still have to setup my linkages, programming, etc. Probably another day or so before I get air under the skids.

As far as the fuselage goes, I did round the nose some more. That's about it. Right now I'm all wrapped up trying to get the mechs airborne.

Patrick
O|||||||O H2 Recovery Team
12-09-2008 11:12 PM
HOMEPAGE  
 
 
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Scale Model RC Helicopters > Approach Engineering eCobra / Swift 16 Build
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