ARS

Hello sdembowy, I am interested in how you got a TP 3S2P 4200mAh to fit in the mini SS, A TP 3S2100 is pretty tight. Also where do have to put that so it balances?

sdembowy

Actually I have a Super Sportster. I noticed the thread started as Mini but then I saw some configs for Super. That's why I listed my setup. Super Sportster has ample room for 3S2P TP 4200 (I use two 3S 2100 zip-tied together and connected using Great Planes parallel board).

Szymon

ARS

That makes sense sdembowy. I was thinking you did major surgery. Here is video of mine. http://www.rcpics.net/img/60120

gwright

I'm sort of a "motocalc junkie",.. however, I've realized over time that it's not very accurate on a lot of setups. What I find it invaluable for is getting the first 8 or 10 props/gears to try, and for comparison purposes. It can be way off in a prediction but still very usefull to compare. If I have a setup i like but want a bit more or less speed or thrust and/or want to increase or reduce current a bit,.. I can plug the flying setup in and compare it to others to see which numbers go up and which numbers go down and get a very usefull indication of what I should change. With the outrunners and no gears it's much less usefull, as there is only a small selection of props that will work and stay within the motor's capabilities,.. but when you add gears to the mix it helps a lot. I've been playing a bit with very low gear ratios on a couple outrunners and some of the results are very eye opening. Not the little A20 on the sportster that this thread is about, but the A30's at 300 to 500 watts. Most people jump on the outrunner bandwagon to eliminate gearboxes, thinking they'll gain efficiency by eliminating the gearbox...and as I expected, it's not really that way. Strange that I can bolt on a low ratio to a large motor,..1.15/1.25/1.4 and use the same prop and battery,.. lower current by a noticable percentage, and barely change the prop rpms,..i.e. efficiency increases dramatically when you add a bit of gearing. Motocalc predicted this change, so I had to try it out

NV

Do you think that an AXI 2212/34 is a good option for a Super Sportster EP ?

Thanks,

NV

GWR

My Feedback: (31)

I fly my MiniSS with an MPJet 25-35/20 geared bl on a 3 cell 2100 TP pack. Flies nice.

JRSflyer

My Feedback: (8)

I am buying a mini sportster and find the above very helpful. I plan to add a tail wheel for ground control as I did on my Husky 400. I know little to nothing about the engines for these electrics. I am gathereing that a 400-480 size would give it plenty of power. What outrunner size and manufacturer would you recommend? I like a direct drive instead of the geared motor.

Thanks for the help. I am a weekend flyer and just enjoy flying around no show boater.

Rick

spicedcrab

rick, i think that the e-flite park 480 outrunner is really overkill, but the park 450 would be a perfect match. the way i look at it, they both will fit, and both are almost the same weight, and if you go with the 480, then in case you want to put it in another plane down the road that is bigger, you will already have a motor that will handle it. as far as the esc, i chose the castle creations phoenix 35, again its almost the same weight as the phoenix 25 but will just handle a lot more for what ever you may want to do in the future. as far as battery go with 3cell lipo 2100, its about the biggest that you will be able to fit in the plane, check the width of different brands (1 1/2" wide is the MOST you will get inside the plane) i used apogee, its a very high quality pack, and it just fits. my combo will give you 25 to 35 mins flight times just fun flying. im not sure of the times if your really pushing it the whole time.
any more questions just let me know, because ive tried many diff combos in this plane, also if anyone needs amp specs on diff props with these motors just ask and i will put the prop on and get a reading for you.
john

JRSflyer

My Feedback: (8)

Thanks

Rick

JRSflyer

My Feedback: (8)

spicedcrab:

Thanks for the prop size offer. I am running a parks 400 (920) with an E-flite 20 amp brushless ESC. The prop is a 9x4.7. any suggestions on a better prop size?

If I use the 450 on the sportster, which version do you recommend and which prop size?

Thanks again.

Rick

JRSflyer

My Feedback: (8)

Sorry, I am an idiot at times. The prop is a 9x6 on this plane.

Have you flown the Goldberg Chipmunk anyone? I was wondering how it handles.

Rick

spicedcrab

jrs;
the 9x6 prop will pull about 11.4amps at full throttle and push the mini ss about 42 mph, (thats with a 3 cell lipo) on the park 400 920. if you use a 2100 3cell you will get about 18 min flight times at full throttle, 45 min flight times flying at the optimum flight speed of 24 mph. i did some other calcs on different props but none were better than the 9x6 you already suggested, looks like its a perfect match for that motor, dont go any bigger because it will push the amps beyond the limits of the motor, you are safe with the 9x6 though. this setup is showing 83% efficiency

mnrcaerobat

My Feedback: (197)

The stock motor mount that comes on this plane has some offset. Do the mods for a outrunner need this built in? I have been thinking of putting the Ultrafly B/12/08 on mine. It sounds like the hacker gives good performance also. I could save a couple of bucks there also.

spicedcrab

hi, leave the stock offset in your mount setup. what i did on my mount pictured in the beginning of this thread, was make the motor plate 90 degrees up from the stock motor rails. i personally really prefer the e-flite outrunners, (450 or 480). the reason is they are easier to mount since they have the mount plate behind the motor, which also makes them run much cooler because the incoming air is not obstructed, it goes directly into the motor. they are very efficient mine get 82%. they have a great alum. prop adapter and built-in nose cone that comes with the motor. ok thats my 2 cents, you can also use one of the motors you mentioned and they are good also you would just have to come up with a slightly diff mount than mine to get them mounted, either way keep that stock offset in whatever you choose.

Hey let us all know how it goes! we love to hear about it, also if you need more specs on anything for this kind of swap, ive had 3 different combos in this plane so far so ive been through a lot of the trial and error part, lol.

John

spicedcrab

a pic of the alum nose cone that comes with the e-flite outrunners; (this one has the park 480 in it)

spicedcrab

opps, sry clicked the wrong pic, here it is;

mnrcaerobat

My Feedback: (197)

Did you modify the battery tray on this plane? I noticed that the space is limited as it is. What pack do you run with that 480? How much run time do you get?

mnrcaerobat

My Feedback: (197)

I noticed the 480 has a wide range specified for the esc. What are you using? I have a phoenix 25 I would like to use.

spicedcrab

hi, i use the apogee 2100 20c 3cell, i usually fly timed for 30 mins then i bring it in, my pack usually shows about 10.5 to 10.8 volts at that point. i only ran it one time till the esc cutoff kicked in as a curiosity thing, i flew my normal 30 mins, then instead of landing i just took it easy and kept making slow passes keeping it real close to me to see how long it would keep going, it didnt kick in until 48mins flying time, keep in mind i was only pushing it for 30 mins, after that real easy. no i didnt cut anything in the plane for the lipo, i just made sure that the pack i bought was no more than 1 1/2 inches wide x .8 inches thick, as it turns out the apogee pack that i chose seems to be the max size that will work, and EXACTLY the right lengh for it to center in the right spot. i had a problem getting the CG right because the brushless is so much lighter than the stock setup, so i moved the esc as far forward as pos (its right behind the motor) and the receiver as far forward as pos, and i push the battery up as far as it will go, until it hits the rib inside the fus. with everything placed like this th CG is right on the money.

i will go get you a pic of the battery, give me a couple mins to get the plane and take the pic

John

spicedcrab

here are the pics showing the esc location, the battery fit, and the receiver location.

spicedcrab

and to answer about your speed controller, your 25 phoenix will be great,. i have a phoenix 35 in this one but the 25 is WELL within specs for the job. i love phoenix controllers too, and all my e-flite outrunners run PERFECT on them.

keep us informed how it going.

John

mnrcaerobat

My Feedback: (197)

Thanks for all of the great pictures. I picked up this one from a friend for some used lipos. I may look at that 480 motor. I imagine it is not challenged vertically. What prop do you use with that combo?

spicedcrab

hi, i had about 30 extra mins before work this morning and took the MSS out for a quick flight, i misjudged my turn and flew into the sun, i lost sight of it until it was below tree level, and it was heading straight down, i pulled back but it was too late. i was lucky enough to almost pull out of it before it hit, so at least it was a glancing blow. i broke the motor mount, cowl, prop, landing gear came off but did not break, just bent. very lucky one, i will be able to glue the motor mount back since it only broke at the plate, new cowl, straighten and re-insert the landing gear. i should have it ready again after maybe 30 - 45 mins of repairs.

spicedcrab

opps, looks like i broke a piece inside the wing too, it be be a little longer repair now, here is the damage;

spicedcrab

mnrc; to answer your prop question, i currently am running a 10x7E APC. It pulls about 14 AMPS and yes it has unlimited vertical, i could go bigger with the prop and pull up to 20 AMPS safely with the motor, but there is no need. it already has tons of power, and i only run it at half throttle with this prop as it is. Well that is until i smacked the ground this morning, lol

John

there was a saying i seen on here once that i liked, i think it went like;

IF IT AINT BROKE...............BREAK IT!