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Old Aug 23, 2010, 08:33 PM
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Originally Posted by Da FrOg View Post
hey microfly does the that deal you got on nitroplanes for 59.99 include the charger for the lipo?
Hiya Da Frog.........No the plane does not come with the charger. But nowadays you can pick up a good quality Lipo charger on the internet for under $50.00. In fact this is the one I'm using now.
http://www.okhobby.com/product.php?id_product=1040
It works great and came to around $37.00 with shipping.
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Old Aug 24, 2010, 01:39 AM
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Joined Apr 2007
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Quote:
Hiya Da Frog.........No the plane does not come with the charger. But nowadays you can pick up a good quality Lipo charger on the internet for under $50.00. In fact this is the one I'm using now.
http://www.okhobby.com/product.php?id_product=1040
It works great and came to around $37.00 with shipping
haha thanks i now have a charger ....any of you guys know where a guy can get some 2mm carbon rods? any major retailers? Im not really fond of buying online....Just ordered one off of Nitroplanes.com. They have great customer service. I'm expecting it to arrive in about err 3 days?
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Old Aug 24, 2010, 02:24 AM
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United Kingdom, England, Saffron Walden
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Originally Posted by Micro Fly View Post
.... 850mah 25-45C batteries .... They can be charged at up to 5C charge rates and the extra discharge rate should provide the punch needed for the electronics on this plane. I'm just wondering how well it will fly with the added weight of the larger battery pack? ....

I've got a feeling that the ESC is limited to 10A (approx). The 450mah was a 20C so was being pushed to deliver 10.19A. For the 20C, 800maH battery the battery was well within the C rating and there was very little voltage drop but even so, WOT only drew 11.31A.

I time the flights and then see what the charger puts back in. This gives me the maH used per second of flying time. With the stock 8x4 the 450maH gives about 4.5 mins agressive flying burning about 1.5 maH per sec. The best "gentle" flying is 0.95 maH per sec. I haven't calibrated the 800mah batteries yet.

I try to keep the charge rate down to 1C (for longer battery life) and use parallel charging to get low charge currents with short charge times. It connects up to 8 batteries, of different capacties in parallel (with the balance connectors also connected in parallel). This means eight batteries are charged in about 1 hour (1C rating). The only stipulation is that I check the dischaged voltage of all batteries and only connect them in parallel if they are within 0.1V of each other.

The idea came from http://www.rcgroups.com/forums/showthread.php?t=1139916. Start at thread 1. The article has 2 ways of doing things, charging through the balance connector or charging through the battery lead with the balance connectors seperate. Post 10 of the article shows this latter arrangement for four 3S batteries that use Deans plugs.

I made mine, the pics show the two parts, charging leads and balancing leads. I also made one for charging six 1S helicotor 100maH batteries at the same time.

I'm not an expert and only copied the article. Please use only the data in the article and decide for yourself if you want to use this method.


retiredbri
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Last edited by retiredbri; Aug 24, 2010 at 02:35 AM. Reason: To emphasize the warning.
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Old Aug 25, 2010, 01:47 PM
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United Kingdom, England, Saffron Walden
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Originally Posted by Micro Fly View Post
I'm just wondering how well it will fly with the added weight of the larger battery pack? .....

Hi Micro Fly
Mine flys fine with the 800mah battery, good for windier days. Here are the results of the tests with the 8x6SF and 8x4.3SF props.

First thing I noticed was that the hub was a lot smaller and the prop adaptor had to be turned round (compared with using the 8x4E prop) so that the small "shoulder" was used. Also, the shoulder was not a snug fit in the rear "nut moulding" on the hub.

The test used a freshly charged Loong Max Tipple 2S, 800maH battery rated at 20C (16amps). The attached graph shows 3 parts.

1 I did a no prop test to see if the motor was 2050KV - with the battery at 8.4V and drawing 1.5 amps, the speed was 15400 rpm. This gives about 1830KV.

2 Next the 8x6SF was used but I only went to half throttle because the thrust caused the "O" ring to stretch and not hold the prop onto the shoulder of the prop saver. I need to get one with more tension and a prop saver that has a "shoulder" that is a better fit. The speed was 6500rpm and the current (at half throttle) was 10Amp.

3 Finally, using the 8x4.3SF, the thrust was not enough to stretch the O ring so full throttle was used. First thing I noticed was that after a total of 1 min of tests, the battery JST connector was warm. The graph shows 8800rpm but with a current of 12.25 amps. This is outside of the ESC limit and although within the 20C rating of the battery, would not be if using a 500maH battery.

I'm away now but will try to get some thrust figures when back.

retiredbri
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Old Aug 25, 2010, 07:56 PM
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Retiredbri...Thanks so much for sharing your knowledge with all of us who are not quite as smart when it comes to the jist of the electrical aspect of these RC airplanes. There is definitely no doubt I will be upgrading my batteries to the 850 mah Hyperions. I fly the hyperions in my ultra micro planes and they seem to perform pretty well. At the risk of sounding somewhat ignorant. My question to you is? Do you think that the current draw when using these 8060 slow fly prop is going to damage the esc or motor on my airplane? If at half throttle the 8060 is already drawing 10amps. Then at higher throttles would I be overloading the esc and possibly burning it out? Also would upgrading to say maybe an 18amp speed control ( I have one laying around ) deviate the problem? I don't mean to keep picking your brain. I'm just a little vague when it comes to the technical aspects of prop/motor/battery combos. I am learning though. Thanks to people like you. I am learning.

Also: What brand prop did you test with? GWS?...My 8060 slow fly props are GWS and the prop adapter that came with my plane seem to fit nice and snug.
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Old Aug 26, 2010, 04:36 AM
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United Kingdom, England, Saffron Walden
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Originally Posted by Micro Fly View Post
.... My question to you is? Do you think that the current draw when using these 8060 slow fly prop is going to damage the esc or motor on my airplane? .....
I couldn't got to WOT because the O ring wasn't tight enough. I've read that flyers using 8x6SF use 2 O rings because the thrust is large.

My interest in using the SF props is to get more thrust at lower revs (= lower air speed) so as to fly slower.

In a week when I'm back, I will try to equate current with thrust with throttle position for the different props. Then I can see if there are any restrictions of throttle position when I fly slower.

Quote:
If at half throttle the 8060 is already drawing 10amps. Then at higher throttles would I be overloading the esc and possibly burning it out? Also would upgrading to say maybe an 18amp speed control ( I have one laying around ) deviate the problem?
At 12 amps the battery connector was warming up after just a minute. All the components need to match. I've not looked at how hot the motor gets yet. When I do the next tests, I'll see what parts get warm/hot.
Also, the thrust at half throttle might be enough to do all that I want and still be within the motor/battery/connector/ESC limits (and maybe to avoid ripping the motor mounting out of the plane).

Quote:
Also: What brand prop did you test with? GWS?...My 8060 slow fly props are GWS and the prop adapter that came with my plane seem to fit nice and snug.
I'm getting better a prop saver and the props are GWS

Back in a week, retiredbri
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Old Sep 05, 2010, 03:40 AM
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Oman, Masqat
Joined Apr 2010
321 Posts
HI guys,

I just finished building my Hawk, unfortunaly my motor burnt out while i was testing the thrust of the plan eon the 8040 Props becuase the prop that came with the plane didnt seem to have enough thrust.

After reading through the thread i noticed that a better motor replacment for this plane is the TURNIGY 2204-14T 19g Outrunner can anyone who is using this motor give me feedback on the powere of the thrust using the 8040 props.
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Old Sep 05, 2010, 09:10 AM
More computers = More fun
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Pennsylvania, USA
Joined Aug 2010
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My 3D hawk is on its way from NitroPlanes.com

Same thing as the Hobbyking one, just includes the servos...
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Old Sep 08, 2010, 03:06 AM
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Originally Posted by Micro Fly View Post
Retiredbri...Thanks so much for sharing your knowledge
Hi Microfly

Got the 8x4.3SF and 8x6SF and compared them with the stock 8x4E. I haven't had a chance to fly with them yet - either wet or windy.

Here are the results (sorry about the table- can't get the headings and values to align)

All tests with 2S 800maH batteries
Weight of model with 800maH batteries = 245grams
Throttle position 3 = midway on the Spektrum di6E
Thrust in grams (28grms = 1oz)

Prop: 8 x 4E
Throttle amps volts watts rpm thrust
1 1.20 8.25 10 3250 37
2 3.20 8.10 26 6000 155
3 6.50 8.00 52 8000 260
4 9.60 7.30 70 9200 335
5 11.50 7.22 83 9600 395
After 80 secs, MOTOR 38deg C, ESC 29deg C

Prop: 8 x 4.3 SF
Throttle amps volts watts rpm thrust
1 1.20 8.25 10 3000 55
2 3.20 8.00 26 5500 165
3 7.00 7.50 53 7400 280
4 9.50 7.20 68 8000 375
5 11.50 7.00 81 8500 430
After 2 minutes, MOTOR 55deg C, ESC 42deg C
Prop: 8 x 6 SF
Throttle amps volts watts rpm thrust
1 1.20 8.25 10 1250 37
2 4.00 8.00 32 4800 272
3 7.80 7.50 59 6200 332
4 13.00 7.20 94 7300 402
5 14.50 7.00 102 7500 402
After 2.5mins, MOTOR 79deg C, ESC 65deg C

NOTE: With the 8x6SF, there is very little difference in prop speed between postion 4 and 5(max) except more current. I think the motor was taking more current and producing heat but only the same thrust.

The 8x4.3SF seems to give the same thrust as the 8x4E but I don't know if the slightly slower prop speed means significanly slower flying speed.

The 8x6SF would be good but I would need to severly limit the throttle end stop to position 3.5 on the Tx. Don't know how to do this with this ESC.

When it gets good enough to fly, I'll let you know how it goes.


retiredbri
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Old Sep 09, 2010, 09:07 PM
More computers = More fun
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Pennsylvania, USA
Joined Aug 2010
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Just got my 3D-Hawk, and it SEEMS all construction went good.

Please tell me what you think!

http://www.rcgroups.com/forums/showthread.php?t=1305512

(Boxhead I hope you dont mind me putting this here )
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Old Sep 10, 2010, 03:33 AM
Look outside the Square
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Gosford, Australia
Joined Jan 2006
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Not a problem Dell, you have done a great Job on yours

Bx
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Old Sep 10, 2010, 08:13 PM
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United States, CA, Modesto
Joined Oct 2009
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I am thinking about getting one of these. I really wanted a juka from dw foamies but this plane looks cool and I wanted to order some other stuff from nitroplanes. so... I wanted to keep shipping limited to one company. So what do you guys think? pull the trigger and get it?
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Old Sep 11, 2010, 03:26 AM
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Totally! Its a great deal too. Mine is shipping out right now!
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Old Sep 11, 2010, 09:33 AM
More computers = More fun
Dellagd's Avatar
Pennsylvania, USA
Joined Aug 2010
75 Posts
I used hot glue to get the 2 fuselages together, so make a nice hot-glue weld along the seam and it is like a unbreakable bond

Works great!

The only real tricky part is getting the z-bends onto the carbon pushrods, and I must say, I am still a bit resentful of them...

EDIT!!!:

Tutorial is up:

http://www.rcgroups.com/forums/showthread.php?t=1306278
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Last edited by Dellagd; Sep 11, 2010 at 02:50 PM. Reason: How To done
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Old Sep 11, 2010, 07:39 PM
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Quote:
Originally Posted by retiredbri View Post
Hi Microfly

Got the 8x4.3SF and 8x6SF and compared them with the stock 8x4E. I haven't had a chance to fly with them yet - either wet or windy.

Here are the results (sorry about the table- can't get the headings and values to align)

All tests with 2S 800maH batteries
Weight of model with 800maH batteries = 245grams
Throttle position 3 = midway on the Spektrum di6E
Thrust in grams (28grms = 1oz)

Prop: 8 x 4E
Throttle amps volts watts rpm thrust
1 1.20 8.25 10 3250 37
2 3.20 8.10 26 6000 155
3 6.50 8.00 52 8000 260
4 9.60 7.30 70 9200 335
5 11.50 7.22 83 9600 395
After 80 secs, MOTOR 38deg C, ESC 29deg C

Prop: 8 x 4.3 SF
Throttle amps volts watts rpm thrust
1 1.20 8.25 10 3000 55
2 3.20 8.00 26 5500 165
3 7.00 7.50 53 7400 280
4 9.50 7.20 68 8000 375
5 11.50 7.00 81 8500 430
After 2 minutes, MOTOR 55deg C, ESC 42deg C
Prop: 8 x 6 SF
Throttle amps volts watts rpm thrust
1 1.20 8.25 10 1250 37
2 4.00 8.00 32 4800 272
3 7.80 7.50 59 6200 332
4 13.00 7.20 94 7300 402
5 14.50 7.00 102 7500 402
After 2.5mins, MOTOR 79deg C, ESC 65deg C

NOTE: With the 8x6SF, there is very little difference in prop speed between postion 4 and 5(max) except more current. I think the motor was taking more current and producing heat but only the same thrust.

The 8x4.3SF seems to give the same thrust as the 8x4E but I don't know if the slightly slower prop speed means significanly slower flying speed.

The 8x6SF would be good but I would need to severly limit the throttle end stop to position 3.5 on the Tx. Don't know how to do this with this ESC.

When it gets good enough to fly, I'll let you know how it goes.


retiredbri
Thanks for the info retiredbri . I hope you had a nice trip as well. I've been flying the 8x6SF for a while now and have had nothing but great results with it. And although I never actually measured the temperature of the motor or esc. After approximately seven minutes flight time they seem to be cool to the touch. I very rarely hit full throttle as there is not much need for it considering with this prop I can hand launch at three quarter throttle and fly around at half throttle without loosing altitude. What I like about the 8x6SF is the ability to fly so slow and still pull off most 3D maneuvers without a glitch. I did order some 8x4.3SF props though. I'm very curious to see how well they handle in the air compared to the 8x6SF. Keep me posted as to your evaluation of the performance of these two props. I'm curious to see if we come up with the same results. I wish you better weather so you can enjoy flying this great plane. Being from Rhode Island... I to am always battling the elements when it comes to Mother Nature. They call us the Ocean State...They should call us the Windy State...LOL

Thanks again..... Micro
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