Composite ARF 2.1M conversion

Composite ARF 2.1M conversion
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Composite ARF 2.1M conversion - 11/21/2007 3:59:40 PM

BaldEagel

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Anyone done an electric conversion of the 2.1M? I have one sitting on the bench and am thinking of an AXI 5345/14 or 16 on 10S LiPo's would give over 200watts/lb taking the finnished weight at 15Lb, but I think this would come out closer to 13.5Lb with all the gubbins for the gas engine not being installed and micro metal geared servos for the elevator at the rear to compensate for the lack of weight up front.

Mike

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RE: Composite ARF 2.1M conversion - 11/27/2007 6:18:17 AM

tIANci

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Not seen the Extra 300 on EP yet, they have the 2M in EP and from what people say it flies nicer than the gasser version as its only about 13.5 lbs. I will probably start on my 2M early next year, will want to try the NEU motor as the 1521 on a gearbox can give about 28 lbs thrust on a 10S set up.

The 5345 sounds good too. I think I will look for a power system that can turn a 22x10 at about 6,500 RPM.

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RE: Composite ARF 2.1M conversion - 11/27/2007 10:58:43 AM

BaldEagel

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Thanks for the reply tIANci

The Axi5345/14 is rated for a 22x10 at 225rpm/v @ lets say 35volts that would give 7875rpm so 10S LiPo's sound about right, its rated for a model of 7.5Kg's thats 16.5Lb in Inperial, max efficiency range is in the 36-85amp range with a capacity to take 110amps for 20s, this all sounds too good to be true, the main reason for going the Axi route is that I have about 10 of there motors already in small stuff and one 4130/16 in a 63" Edge already on a 15x10 and it preforms superbly, I have a few Mega Motors and they just seem too heavy for the preformance.

Going on too speed controllers, I have used Jeti in the past and like the way they give an indication of low battery by bliping the thottle for you, and leave enough power for a circuit and landing, also at the expence of the battery if you go to low throttle and back up to WOT it will allow full power for a short period, I know the Hacker controllers don't do this they just go to low power and thats it, no chance if you are out of position when that happens, do you know if there are any other controllers that give a warning like the Jeti?

Mike

< Message edited by BaldEagel -- 11/27/2007 10:59:11 AM >

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RE: Composite ARF 2.1M conversion - 11/27/2007 6:04:55 PM

tIANci

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Mike - well the best warning I have for controllers is using my sense. Its always obvious that your batt is already about to cut off. There is a very obvious loss of power. I have hardly ever flown till the LVC kicks in. At the moment I am messing with cheap motors and ESCs to see how they perform, I am not trying out the branded ones because I know they really will work. I hope to read about your build. Looking forward to it.

The DualSky 90A ESC has a problem, at higher amps it cuts off, something like the LVC crossed with cogging. Hence, I am using it for 10S set up for planes of no more than 12-13 lbs. On my MidWest CAP it only can handle a 20x10E prop ... nothing more, at 2,000W its not sufficient for pulling big big loops. I am waiting for a HiModel 100A ESC to test ... I hope it works! I want to get about 2,500W for my CAP.

I got a few AXIs too ... the 2826/12, 4120/18 and 4130/16, they are great but it will rust in Asia, I always cover them with a coat of Singer oil and then I don't touch them at all. Once in a while I will oil the can. They perform well and I must say I have no complains. Why not try an APC 16x10E on your 4130/16, its good with that prop.

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RE: Composite ARF 2.1M conversion - 11/28/2007 12:08:17 PM

BaldEagel

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tIANci

I get your meaning in the fist instance re the controller cut outs, but the Hacker one I have been using just seems to go from supplying full power to can't keep it in the air power when the battery gets low, on the smaller Jeti ones I am using on most of my foam stuff the power loss is obvious before the blipping cuts in and you have plenty of time to come around for a decent landing, I don't konw if the high end stuff does the same I will have to investigate that. On most of my I.C. stuff I get so carried away that I fly around until I dead stick most of the time, I usually get a warning with the engine sagging in a verticle manouvre just before it cuts out, I am the club expert at landing on the patch dead stick. LOL We also have a Dyke just in front of the pits, and I am the club dunking champion as well, we have a trophy of a small diver sitting on top of a tumble dryer that has my name engraved on it.

Thanks for the heads up on the DualSky that is worth knowing.

Don't get much rusting in the UK as the humidity is quite low, but a coat of WD 40 would not hurt and is a good idea, thanks for the tip, Funny you should say about the 16x10 APC when I bought the 15x10 APC I also bought a 16x10 but the 15 has performed so well I have not tried the 16, I will the next time out.

Mike

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RE: Composite ARF 2.1M conversion - 12/4/2007 2:48:43 PM

BaldEagel

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I am going ahead with this conversion, the electric formers for the Composite ARF 2x2 look as though they will fit, so they are on order, I am thinking of the Pletenburg Xtra 30 motor as it fits in the spinner and would go a long way to compensate for the lack of weight by not putting a petrol engine in, my main concern is a heavy tail.

Anyone know of a light strong 7Kg servo to use dual on the elevators?

Mike

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< Message edited by BaldEagel -- 12/4/2007 2:49:17 PM >

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RE: Composite ARF 2.1M conversion - 12/4/2007 5:06:37 PM

tIANci

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Mike - lovely Plettengerg you got there, I only have the Orbit 25/18. They are lovely motors, balanced too! On a lower budget, I find the 5645s to be good. I do like the Futaba 9402s but they are hard to come by nowadays. I have not tried JR digitals but seen too many get the 'jitters' that I rather not try them.

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RE: Composite ARF 2.1M conversion - 12/4/2007 5:44:41 PM

BaldEagel

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Ian

I havn't got the Pletenberg yet, its on order awaiting delivery, there are some very strange figures on the Pletenberg site that just don't make sence, the Newton force given for thrust does not correspond to the Onz given, I don't know what to belive, but they have good reports so I don't think I will worry too much.

I think I am going to have trouble finding a servo better than the Hitec 5955's I usually use, I am just trying to lighten up the rear end, unless I can find something suitable I will have to go with closed loop on the elevators as well as the rudder and put the servo's under the canopy. I have Hitec 5645's on rudder in a few planes also the 5625's on elevators and ailerons, the 5645's seem to be bulit proof, mind you I have never had trouble with the 5955's either.

Perhaps I should wait untill the motor arrives so that I can estimate how much of a problem there will be with tail weight.

Mike

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RE: Composite ARF 2.1M conversion - 12/5/2007 1:27:24 PM

Glacier Girl

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Mike, NOT IGNORING YOU

, on your esc's hard cut off problem. Is it programmable?
Maybe switch to a soft cut off, would give you a little more time to get her down vs the bang it's dead now.

As for servos, let me check when I get home, I'll let you know what Hitecs I'm running.
If memory serves me they are 42oz at 4.8 volts. Size wize, they are between the Hitec 81's and a regular full size servo.

Not enough torque? I do have those Blue Bird versions, 300+ oz of torque.

< Message edited by Glacier Girl -- 12/5/2007 1:29:18 PM >

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RE: Composite ARF 2.1M conversion - 12/5/2007 1:44:58 PM

BaldEagel

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GG

Unfortunatly the Hacker ESC is not programmable for a soft cut off, I have learned to live with this on the SebArt and just fly it around the field boundary so always within landing distance, but with a 2.1M plane I rearly don't want that to just cut out or get so low on power suddenly that I can not sustain flight, I will just have to use a timmer and come in early, I am not used to that I usually fly my IC's untill the engine stops and then dead stick land, but don't wish to risk the 2.1.

Its the overal weight thats the issue with the torque available, there is nothing in the Hitec catalouge that I can find suitable.

Plettenberg are ignoring me, who's been talking?

if they do not respond within the next 24hrs I will re-think my motor options, GG knows I do not like being ignored.

Must check my card to see if its been debited by them.

Mie

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RE: Composite ARF 2.1M conversion - 12/5/2007 3:16:07 PM

Glacier Girl

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How much you need??????

I'm using the Hitec 225bb, aileron servo, .95oz weight. 54.15 @ 4.8V, 66.65 oz @ 6V

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RE: Composite ARF 2.1M conversion - 12/5/2007 3:50:56 PM

BaldEagel

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GG

About 200 to 250onz on each elevator half a bit more than the 225 can supply I think?

Up to now I have been using 5955's which give 333onz when cold, so as you can see I am up a gum tree persuing this I think and am just going to have to close loop the two elevator halves and put the servo's under the cockpit.

Mike

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RE: Composite ARF 2.1M conversion - 12/5/2007 9:20:14 PM

Glacier Girl

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quote:

ORIGINAL: BaldEagel

GG

About 200 to 250onz on each elevator half a bit more than the 225 can supply I think? Up to now I have been using 5955's which give 333onz when cold, so as you can see I am up a gum tree persuing this I think and am just going to have to close loop the two elevator halves and put the servo's under the cockpit.

Mike

Dang Mike, Maybe hydraulics might be a better answer. Oh well I know it's GT time over there.

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