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Latest blog entry: Extreme RC AUSTRALIA
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At last recieved my two stock fans.
Was looking for a low watts aplication for my newly build rbc ta 183. Had in hand only two motors a het 2w that for sure is not for this fan, and a kontronic fun 480-33 After balancing with stock adapter (was not easy) measured the fallowing with trumpet lip: Battery: haiyin 3s 40c 3300 mah Freshly charged Amps:75 (too much but only for a short period as voltage drops) Watts: 700 This is out of spec for motor but at 3/4 of throtle can manage Amps 55 Watts 550 This is very similar to the het 2w amp draw and watts,so as voltage drops there is no danger of having the extreme amps. Think this configuration should work The sound is better as with wemotec fan, but waiting the results in the air. Lets see if the eficiency penalty is worth. Was pulling 450 max amps with freshly charged same lipo. |
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It has been said, that short can 28mm motors cannot be used for this fan. But, I have to differ. It's all in how much power you intend the little motor to use.
https://www.rcgroups.com/forums/show...postcount=4776 The best thing with this set=up, is the light weight for the system. Only a 2200 4s pack is needed. Before I opted for a different fan, in the intended model, I ran (6) pack cycles though it. The motor got reasonably quite warm. But no more than a HET 3W in a minifan on 4s. But with 100+W and about the same amp draw. Fuzz |
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My current motor is the L2855-2300 on 4s. 97grams and only runs warm. Good for 2.5lb ~650watts. |
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5S L2855-2300kv..... lasts long term.
900w to 1050W sort of ranges. 52A to 55A ranges. 800W in my Vampire at 43Amps. Due to airflow restriction. Dynam Meteor 160kph. 1.3Kg thrust in-plane Dynam twin CS10 Me-262 140kph 2.7/2.8Kg thrust in-plane (mediocore efflux speed but very strong thrust). They are not a 'high' power combo, just 'good'/above-average combo. A very nice and cheap 5S solution, to match/beat 4S - for less cost and same weight etc. |
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In the ME-262, 1.7kg 58amps using nanotech 4400may 65c for both motors. |
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I'm also running a L2855-2300 on 5S in a Hobbyking/ProEDF composite F-16. It's really disappointing! It weighs 1350g ready to fly but it certainly doesn't produce anywhere near that thrust - I would say more like 1100g or so as doing a vertical test (holding it vertical and letting go) results in it dropping. It flies nicely but is "not-fast" From memory, I'm getting about 620 - 650W on these. I haven't checked the battery voltage so maybe that's the issue. I'm using 2200mah 5S nanotech 45C in each. Or it could be the ducting, especially on the F-16 - the EDF us located right in the middle - probably a good 12 inches from the in-take. |
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Last edited by Slaanesh; Oct 02, 2012 at 01:47 AM.
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Seeing I use the same exact same combo (motor, fan, esc, battery) across a number of planes, I see the quite notable differences are due to "airflow restriction", whether inlet, exhaust, shapes etc.
To get 1100g thrust you need approx 800W or a bit more. 1100W will give you 1500Kg approx. That F-16 sounds close to my Meteor, and is even quite similar 'typical jet fighter' form of ducting and slick aerodynamic profile. I have never tried a Nano for these. $70+ for a bit more power over a $20 battery? Not worth it... and not required. Mine cover that 800W to 1100W range, for more than adequate speed in each plane. But if you want SPEEEEEED.... you have to pay for it. (Also in motor life). (There is now way that F-16 is 600W..... it will be 800 - 900W. It would not even fly at 600... not very well anyway! My guess....... 950W... test it again.). |
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Just for info to Burdo and others:
You mention 50Amps from a 4S 2650mAH 35C, they cost $30 It weighs 291g 50A x 14.0V (??) = 700W You will need a 60A ESC or higher. It would last 3.1minutes at WOT. If you used a L2855-2300kv on a 5S Zippy 3000mAH 20C battery, which is $20 ($19.80), and weighs 379g, you get 1100W at 55A and would last 3.3mins at WOT. Same ESC needed. But you also have the option that you could fly at 70% throttle, for the same thrust as the 4S combo, and get over 4mins easily. So the total combo was $10 less for 5S and you got 45secs more flight time. The 80g heavier weight is a nothing really, plus foamies are too light anyway, and the huge amount more power will exceed that difference by miles too. It would be about 900g thrust for the 4S and 1.30Kg for the 5S (on that battery). For that $10 less...... Nothing compares to that 5S combo, it just slaughters all others for the cost and with 'good' output (equal or better than 4S). Nano Schmano, LOL.... all that matters is the end result - and what it cost You can't even justify 4S on "I dont need as much power".... as it is CHEAPER to have MORE. Or, throttle limit it to get more flight time anyway. You can even restrict airflow ON PURPOSE, to get a better jet sound, whilst using the less power amount that will cause, and have the lower thrust you only 'needed' if you really wanted to. There is just no other combo of use at all, for this 1100W and under situation. Then above it (1100W upwards) you do start to have a FEW options/choices you could make. But even then, that next level is almost only HET (with a narrow window for cyclone power), unless you can get a cheap Turnigy XK (which none are around anymore). So really, the useful effective/cost choices in the CS10 are quite small. |
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Last edited by PeterVRC; Oct 02, 2012 at 03:11 AM.
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That's for a twin. I also use cheaper banks as well. I found that others don't hold voltage well resulting in lower rpm and thrust.
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+1 on this combo. It's the cheapest effective for airframes up to 1.2kv. |
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