BaldEagel

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

tIANci

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.

BaldEagel

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

tIANci

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.

BaldEagel

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

BaldEagel

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

tIANci

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.

BaldEagel

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

Glacier Girl

My Feedback: (4)

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.

BaldEagel

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

Glacier Girl

My Feedback: (4)

How much you need??????

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

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

Glacier Girl

My Feedback: (4)

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

BaldEagel

Anyone know where I can get one of these, looks like the only true ballance charger out there that will handle 10 cells.

Mike

BaldEagel

The formers have arrived from Composite ARF, and will now have to wait until I get the motor, this also stops me finally positioning the elevator servos's, until I know the nose weight I do not know if I have the capacity in the tail to take the servo's, will not be a unsermountable problem if needed I will close loop link the tail servo's and put them either side of the rudder servo in the cockpit. Just have to wait for the motor now, patience is a virtu I am told.

MIke

BaldEagel

Photo's of the formers:
First photo shows the formers for the installation of the old style Plettenberg
Second photo shows the formers for a Hacker installation with gearbox (horrid)
Third photo shows the formers I will be using to install the new in spinner Plettenberg

Until I get the motor I don't know how much room I have behind the spinner to install the front former, so I do have to wait untill the motor arrives before I can install these.

Mike

BaldEagel

Further photo's which may help to understand how the different formers go together for the different installtions in the 2x2.

Mike

BaldEagel

I have now received the Bantam charger and the two PB6 ballancers to enable up too 12S LiPo charging, a very neat idea is being able to check the voltage of each individual cell on the charger LCD after hook up, you can also do this on the PC interface, but its more convenient on the charger panel. The PC interface gives lots of information, including a capacity check.

Mike

BaldEagel

Looking at the Schulze Future 32.80KA or the Jeti Spin 90 anyone any experience with either of these, I have read of some problems with the Schulze, but no news on the Jeti.

Mike

TampaRCGuy

My Feedback: (282)

Has anyone compared the Jeti Opto 90 to the CC HV110?

Evan

didiwatt

My Feedback: (38)

I have been flying a 2x2 on electric now for about a year. I am using a Hacker A60-18M with an APCE 24x12 and 10 cell 5000mah lipo's. Speed controller is a CC 85. Max amp draw is 75 and I am producing 2600 watts.

I painted the basic plane with base coat clear coat with color change trim, so it is about a pound heavier than normal. With the 5000mah lipo's, it weights 16lbs. Tha calculates to 162 watts per pound. I have a DA-50 version that weights 15lbs.

The power to weight ratio is good for IMAC and light 3D. It will hover but the pull out is ever so slow. 12 cell would cure this but I am satisfied so far and like flying it. If I want staight up crazy power, I fly the DA version.

I placed the stock firewall where it needed to be for a DA-50 in case I decided to go back to gas. The Hacker adjustable motor mount worked great.

Don't worry about tail weight. I have two 8411's in the back for elevator. To get the recommended cg, I actually had to move the lipo's back as far as I could under the cowl and still be able to reach the rear hold down strap. I have the 6 cell radio battery just behind the firewall and should move it back under the canopy but I have not got around to it yet. The front of each 5 cell lipo is about 1/4" in front of the firewall.

Paul

BaldEagel

Paul

The 2.1 is a replacement for the 2x2 its lighter all around so I am told by Comp ARF, but I am using the Pletenberg in spinner motor which puts the weight of it in front of the cowl, this would help with tail weight, but I rearly want to wait until I have everything in temporary place before I dedied on the placement of the elevator servos., but thanks for the input.

The Pletenberg has now arrived and I will start to install this shortly.

Mike

tIANci

Mike - lovely looking motor you got there. I just realised I should not be wasting time with the cheap China motors for big set ups. Even the AXI will give easily 500W more output than the China ones. Hmmmm ... time for me to pull out the motor and put in a branded motor.

TampaRCGuy

My Feedback: (282)

Can anyone recommend carbon fiber props in the 17" diameter? This will be used in a Showtime 902 electric conversion, 2000 watts approx. I have the APC 17x10e props to test.

BaldEagel

tIANci

Your right on there, I have a AXI 4130/16 in a SebArt Angel and its as good as the Hacker version, the only reason mine is an AXI is because I had it already.

The Plettenberg is an awfully nicely built motor, it will be interesting to see how it performs, I will have to get it on the test rig and do a complete analysis on it.

Mike