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But I thought any EDF using above 70mm should go at least 4 cells? Moreover that web provide the statement that. 'the plane will fly well if run with a 5S or 6S pack. A 3S pack will not power the EDf sufficiently.'
In another words, Am I wrong to say 3 cells for 90mm EDF = underpowered?
But I thought any EDF using above 70mm should go at least 4 cells? Moreover that web provide the statement that. 'the plane will fly well if run with a 5S or 6S pack. A 3S pack will not power the EDf sufficiently.'
In another words, Am I wrong to say 3 cells for 90mm EDF = underpowered?
You are right , the kit says it ,It is underpowered with 3 S with the stock fan that comes with the kit.
I used the experimental 90mm EDF that can produce more than enough thrust on 3S Lipo on the hawk. The result is it keeps the plane lighter.If I had proceed to use another stock fan with 4S or 5S set up, the Plane would be heavy.
The ROG of the plane when set up properly with the 3S setup is less than 30metres. I posted this clip before you may have miss it .
See video clip of the B.Hawk take off and landing.
960mm wing span EDF on 90mm EDF with special 3 bladed modified impeller install.Good power plant. very short take off. It runs on 3 cells lipo and use a 28-x...
You are right , the kit says it ,It is underpowered with 3 S with the stock fan that comes with the kit.
I used the experimental 90mm EDF that can produce more than enough thrust on 3S Lipo on the hawk. The result is it keeps the plane lighter.If I had proceed to use another stock fan with 4S or 5S set up, the Plane would be heavy.
The ROG of the plane when set up properly with the 3S setup is less than 30metres. I posted this clip before you may have miss it .
See video clip of the B.Hawk take off and landing.
960mm wing span EDF on 90mm EDF with special 3 bladed modified impeller install.Good power plant. very short take off. It runs on 3 cells lipo and use a 28-x...
You are right , the kit says it ,It is underpowered with 3 S with the stock fan that comes with the kit.
I used the experimental 90mm EDF that can produce more than enough thrust on 3S Lipo on the hawk. The result is it keeps the plane lighter.If I had proceed to use another stock fan with 4S or 5S set up, the Plane would be heavy.
The ROG of the plane when set up properly with the 3S setup is less than 30metres. I posted this clip before you may have miss it .
See video clip of the B.Hawk take off and landing.
960mm wing span EDF on 90mm EDF with special 3 bladed modified impeller install.Good power plant. very short take off. It runs on 3 cells lipo and use a 28-x...
Cheers
Bro, just a reply to your number of s setup.
Normally, higher S goes lower in mah capacity. Lower S goes higher in Mah capacity. In most of my plane and heli applications, the weight differences between the 2 is actually negligible.
It is the same for planes, I am running 4s 4000mah on my EDF. If I can do it all over again to achieve the same 1 kw. I will go for 6s 2650mah config (both 450ish gram). There are no weight differences, I still can get the same power at even lower current draw of 45 amp vs 67 amp. And if I need to, I can still command a higher peak of more than 1kw because I have a lot of room to do so. I am sure I will go cooler and have longer lasting battery with better flight time.
I am thinking in the case of your application, the stock is not heavy, you wanted to go even lighter for a short ROG. I am not sure about the gain you made, what is the watt per pound difference between your stock and 3s setup? I am guessing you are also more than likely to have experienced a loss in performance even though you got lighter.
Stop looking for a gyro in my plane, they are all in the head.
Normally, higher S goes lower in mah capacity. Lower S goes higher in Mah capacity. In most of my plane and heli applications, the weight differences between the 2 is actually negligible.
It is the same for planes, I am running 4s 4000mah on my EDF. If I can do it all over again to achieve the same 1 kw. I will go for 6s 2650mah config (both 450ish gram). There are no weight differences, I still can get the same power at even lower current draw of 45 amp vs 67 amp. And if I need to, I can still command a higher peak of more than 1kw because I have a lot of room to do so. I am sure I will go cooler and have longer lasting battery with better flight time.
I am thinking in the case of your application, the stock is not heavy, you wanted to go even lighter for a short ROG. I am not sure about the gain you made, what is the watt per pound difference between your stock and 3s setup? I am guessing you are also more than likely to have experienced a loss in performance even though you got lighter.
Edmond,
Is me again.. I finally managed to launch my F-14 with the twin set-up, 2x3900kv EDF motor with 70mm fan, 2x40A ESC, y-cable it to a 4S 4400mah, produce close to 950W+ in total, I measured about 30A+ per motor. However, the plane go off nicely and fly very scale, I am only happy for less than a minute, the plane down with smoke , after flight check, both ESC burnt badly and one motor is gone as well... m I using too high maH or the ESC rating is far below expectation?
Is me again.. I finally managed to launch my F-14 with the twin set-up, 2x3900kv EDF motor with 70mm fan, 2x40A ESC, y-cable it to a 4S 4400mah, produce close to 950W+ in total, I measured about 30A+ per motor. However, the plane go off nicely and fly very scale, I am only happy for less than a minute, the plane down with smoke , after flight check, both ESC burnt badly and one motor is gone as well... m I using too high maH or the ESC rating is far below expectation?
Rgds
David
Hey David,
Your setup check on amp draw seems to check out fine. On hearing one of your motor is gone? Is that motor rated to take that power? From what I am seeing, I am guessing that the motor burnt and as a result clanked up the current which also took out the ESCs?
What is the make of your motor and esc?
Stop looking for a gyro in my plane, they are all in the head.
Your setup check on amp draw seems to check out fine. On hearing one of your motor is gone? Is that motor rated to take that power? From what I am seeing, I am guessing that the motor burnt and as a result clanked up the current which also took out the ESCs?
What is the make of your motor and esc?
Motor : C20pro 3800kv... from H.C., product description as EDF70 with 3800kv Motor Assembled
ESC : Hobby Wing Pentium-40A
I just tried to run the set up again with a 4S 3000maH, the current draw is confirmed at around 30~32A which I think the ESC should be able to take it, but one thing I found out is, all power line are relatively hot which I have no confident on longer run. From the forum, looks like I should use only 3S but I believe current draw will relatively increase to achieve such expected power (or wattage) and that's need higher current ESC, am I right? I am still unable to figure out the root cause except I wonder am I using to high C on the batt.; 30C ok?
Motor : C20pro 3800kv... from H.C., product description as EDF70 with 3800kv Motor Assembled
ESC : Hobby Wing Pentium-40A
I just tried to run the set up again with a 4S 3000maH, the current draw is confirmed at around 30~32A which I think the ESC should be able to take it, but one thing I found out is, all power line are relatively hot which I have no confident on longer run. From the forum, looks like I should use only 3S but I believe current draw will relatively increase to achieve such expected power (or wattage) and that's need higher current ESC, am I right? I am still unable to figure out the root cause except I wonder am I using to high C on the batt.; 30C ok?
Rgds
David
hey bro,
did not sound quite right. the published test data is as follows
Test data;
@ 10v
Current: 29.6A
Thrust: 24.8oz
Power: 296W
@ 11.1v
Current: 34A
Thrust: 28.9oz
Power: 377.4W
@ 12.6v
Current: 39A
Thrust: 33.3oz
Power: 491.4W
3s already 34 amp, something is not right. You want to start a thread specifically about that? So more people can see it visibly to answer. I have no experience with that power setup. If the wires are getting hot, that means the cable could not take the kind of power you are putting through it. Need something bigger, what Awg cable?
Start a thread, we discuss from there.
Stop looking for a gyro in my plane, they are all in the head.
did not sound quite right. the published test data is as follows
Test data;
@ 10v
Current: 29.6A
Thrust: 24.8oz
Power: 296W
@ 11.1v
Current: 34A
Thrust: 28.9oz
Power: 377.4W
@ 12.6v
Current: 39A
Thrust: 33.3oz
Power: 491.4W
3s already 34 amp, something is not right. You want to start a thread specifically about that? So more people can see it visibly to answer. I have no experience with that power setup. If the wires are getting hot, that means the cable could not take the kind of power you are putting through it. Need something bigger, what Awg cable?
Start a thread, we discuss from there.
Done.. the subject is "3S or 4S on a 70mm fan ...".
Normally, higher S goes lower in mah capacity. Lower S goes higher in Mah capacity. In most of my plane and heli applications, the weight differences between the 2 is actually negligible.
It is the same for planes, I am running 4s 4000mah on my EDF. If I can do it all over again to achieve the same 1 kw. I will go for 6s 2650mah config (both 450ish gram). There are no weight differences, I still can get the same power at even lower current draw of 45 amp vs 67 amp. And if I need to, I can still command a higher peak of more than 1kw because I have a lot of room to do so. I am sure I will go cooler and have longer lasting battery with better flight time.
I am thinking in the case of your application, the stock is not heavy, you wanted to go even lighter for a short ROG. I am not sure about the gain you made, what is the watt per pound difference between your stock and 3s setup? I am guessing you are also more than likely to have experienced a loss in performance even though you got lighter.
Hi Edmund, you are quite right. I can maintain the same weight by going 4S
lipo of a suitable capacity and weight, I have plans to change to a lower KV motor and try a 4S . Unfortunately I have to shelve the plan as this plane need a suitable pave runway.
The place I use to R.O.G. this plane is being shut down by the authority.
Meanwhile the B Hawk is hanging on my shelf collecting dust and spider webs.
Hi Edmund, you are quite right. I can maintain the same weight by going 4S
lipo of a suitable capacity and weight, I have plans to change to a lower KV motor and try a 4S . Unfortunately I have to shelve the plan as this plane need a suitable pave runway.
The place I use to R.O.G. this plane is being shut down by the authority.
Meanwhile the B Hawk is hanging on my shelf collecting dust and spider webs.
Cheers and thank you for your contribution.
Bro, come visit us at PFW. F22 will be more than happy to orientate you for takeoff as he (I think) is flying the BAE Hawk too over there.
Stop looking for a gyro in my plane, they are all in the head.
960mm wing span EDF on 90mm EDF with special 3 bladed modified impeller install.Good power plant. very short take off. It runs on 3 cells lipo and use a 28-x...
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