I know we all walk around with a few heli formulas in our heads.

But have you seen this?

heliCalc

IntegrityHndywrk,

I bought a HobbyWing 20A ESC from helidirect today. The same one you use.

When I came across this:

VIPER VSH2556 Brushless Motor - TREX250

Price: $39.99
KV: 5600
Max Current: 18/22 burst
Outside Diameter: 28mm
Shaft Diameter: 2.5mm
Max. LiPo Cells: 2 cells
Cooling fan design for the air flow that keeps the motor cool.

It's the only one I came across that is closest to stock 6000kv. I measured the outside diameter. It can be made to fit just barely.

I was slightly tempted...

Originally Posted by IntegrityHndywrk

Do you think the 4f200 stock motor suffers more from lack or torque or lack of head speed?

The reason i ask, is when i get the new motor. It seems from everything I've been researching. The motor I'm getting will come with a 17T pinion. The 4f200 uses a 18T pinion. So the stock motor being reported 3900kv and this new motor being reported at 5000kv. What should be happening here with the 17T pinion on this motor is comparable head speed with more torque and less amperage draw on the battery and ESC resulting in longer flights and a cooler motor.

Now if we were to say that the 4f200's main pitch change draw back would be lack of head speed. Which does not seem to be the case honestly. I could install the 18t stock pinion on the new motor and get more head speed out of the rotor while loosing some torque. But it seems that the thrust of the rotor and head speed in general are more then sufficient. It seems like to me the problem, if any, is that when quickly changing pitch or using pitch to it's extreme in a punch out. The motor will bog some. If I'm not mistaken, thats a lack of torque issue? So the 17t pinion or maybe even a 16t pinion would probably be preferable for a all around more efficient flight .

Any thoughts on this?

I should say the 4F200 stock motor require more torque, seems speed is more then adequate for the lift.
I strongly feels that 16t pinon would be good & reduce some heat generated by the motor, as I had the same experience on 450 size motor.
But I'm doubt there is any 16t pinon for the stock motor is available.

Since I had mod changes to the original frames to fit in EMAX servo.
I'm all out to make the complete change for my 4F200 do make it flies better than stock electronics.
I'm still hunting around whats available with best results.
The 4F200 prove to be my most difficult I ever encountered with very limited electronics & mechanical parts available for the modification.

The Turbo Ace 352 motor is pretty cool! I like it. It's quiet and runs very smooth and cool. It was 98 degrees here before adding the heat index and tanning index. With my Hobbywing 20A ESC. Everything was running within reasonable temperatures.



More info:
http://www.rcgroups.com/forums/showt...1#post22104539

I went ahead and started a build log to try to start getting some info and pictures together. Right now it just has some repair info on replacing the frame and fixing the boom, replacing the belt. Nothing special or too detailed. The info on the TA 352 motor as well. Plus a new post about the hobbywing Skywalker 20A esc. Along with a video of how i manage to get it into programming mode.

http://www.rcgroups.com/forums/showt...1#post22104328

After some trimming adjustment for the new install Emax servo, the flight characteristic is much improve from original 766 servo.
The Emax servo apparently having more throw and travel, which needs to trim down to correct pitch movement.
Flying is much smoother & very strong cyclic control I'm very please with it.
The stock receiver RX2612 is so bad for the tail.
Now I will get a new RX2618 to replace the stock receiver hopefully will have better full control for the tail.

I strongly advise the change from the stock servo with metal one, if haven't done so.

Originally Posted by Tovin

After some trimming adjustment for the new install Emax servo, the flight characteristic is much improve from original 766 servo.
The Emax servo apparently having more throw and travel, which needs to trim down to correct pitch movement.
Flying is much smoother & very strong cyclic control I'm very please with it.
The stock receiver RX2612 is so bad for the tail.
Now I will get a new RX2618 to replace the stock receiver hopefully will have better full control for the tail.

I strongly advise the change from the stock servo with metal one, if haven't done so.

Yes it absolutely will!!! Your tail will be much better with the 2618! It is a must have upgrade!! The heli will be more stable. The tail will hold tighter. Take off and landings will be smoother and safer from tip over.

Originally Posted by IntegrityHndywrk

Yes it absolutely will!!! Your tail will be much better with the 2618! It is a must have upgrade!! The heli will be more stable. The tail will hold tighter. Take off and landings will be smoother and safer from tip over.

I can second that based on my V200 experience. The 2618 holds the tail rock solid.

I recently installed my stock motor again to compare to the turbo ace motor. I shot another video with some pitch pumps and things. The stock motor does have a higher head speed while using the same pinion as the Turbo Ace motor. But the turbo ace motor is the more efficient for heat management.


Here is the link to the Motor Comparison with video from both motors::
http://www.rcgroups.com/forums/showt...1#post22104539

I got a notification from Futaba Hobby Services that they are replacing my S3154 servo under warranty. They inspected the servo and found the amp board is shorting and the motor has a twitch.

To high-lite the level of service to expect from Futaba, I attached a screen shot of the work order below.

That web site, ooh ooh model dot com, they are far too frustrating to do business with. Apparently they have become experts at listing stock on their website for which they do not carry.

So I canceled my order from ooh ooh model dot com. I placed the order on July 3rd. The order was originally for three EMAX ES08MD servos, a UBEC, a 40A ESC, a V200D03 canopy. Order has not shipped. Been playing the email game with them regarding parts not being in stock and me replying with "okay what about these parts then?" and them replying "sorry sir those are out of stock" and me saying "but your web site says they are in stock." At one point they even suggested this:

Thank you for your cooperation, but i'm terribly sorry that the 4F200-z-27 is also out of stock, to be honest, we don't have enough 4F200 parts in stock now, we have enough this part in stock: HM-4F200-Z-08, would you like to this one instead?

I'm really sorry for the trouble and thank you very much!

And the next day even those were out of stock. My final email, last evening, I asked them to cancel my order and refund my money. They say my money will be refunded to my PayPal account in 2 days.

I really tried to be patient with them. Apparently too patient!

So now I have an order for EMAX ES08MD with hobby-wing.com $12.00 each... have to see how this goes.

Originally Posted by razorblade

I got a notification from Futaba Hobby Services that they are replacing my S3154 servo under warranty. They inspected the servo and found the amp board is shorting and the motor has a twitch.

To high-lite the level of service to expect from Futaba, I attached a screen shot of the work order below.

Nice. No nonsense fixed.

Originally Posted by razorblade

That web site, ooh ooh model dot com, they are far too frustrating to do business with. Apparently they have become experts at listing stock on their website for which they do not carry.

So I canceled my order from ooh ooh model dot com. I placed the order on July 3rd. The order was originally for three EMAX ES08MD servos, a UBEC, a 40A ESC, a V200D03 canopy. Order has not shipped. Been playing the email game with them regarding parts not being in stock and me replying with "okay what about these parts then?" and them replying "sorry sir those are out of stock" and me saying "but your web site says they are in stock." At one point they even suggested this:


And the next day even those were out of stock. My final email, last evening, I asked them to cancel my order and refund my money. They say my money will be refunded to my PayPal account in 2 days.

I really tried to be patient with them. Apparently too patient!

So now I have an order for EMAX ES08MD with hobby-wing.com $12.00 each... have to see how this goes.

They offered you ball linkages in place of a tail belt. Thats classic. Yeah, i never would have ordered from them if they weren't the only place i know of to get V120 sized servo gears from for this price.

Thats really cool about your servos. Futaba is top notch. I just wish they had a servos this small that looked like this:


It looks like i'm going to end up getting a set of these. They should work out fine. I just am anticipating having to get a 2702V RX to go with them. Otherwise i don't know about their viability with the 2618V. But they look like sweet servos for only $12. Thats what i pay for my stock servos.

In a related story! I ordered a set of Savox 0257MG servos from Savoxusa.com on 06/28 and they still have not arrived. So it's looking more and more like i have a spare 2702V RX from my v450 anyway. I ordered a set of replacement gears for all 4 servos on the 3rd and they have already arrived. If you want to talk about BS shipping practices. This is the damn MFG! I could have ordered from china quicker. In fact! You know what! I ordered from Terance the day before or something like that. His package had a tracking number and will probably arrive tomorrow. Unlike my Savox order. No tracking, no definite web site description stating the mailing date. Nothing. Just "you can no longer change or edit your order because it is in the final stages of processing or has shipped already"

Thats it, nothing else.. Plus they charged me sales tax (see screen shot below) and my 7 days ground is going to take the full 7 days to ship to me from, what i can only assume is shipping from the SAME STATE (since they charged sales tax). That!, right there is BS if I've ever seen it. Especially since their address given on the web site is in Utah.

4f200 - Flips and rolls in the wind (4 min 17 sec)

Hey Razorblade, whats the word on those Emax servos? I found them on ebay for like $7 each. Thinking about putting in an order and waiting a month from china.

I suppose it wouldn't matter if they work for you or not. I still need to order them to determine their status with the 2618V and 2612V RX I suppose.

EDIT:
Never mind, the ebay servos are ES08A not MD.