700 E5

[lae88]

Hello from England UK, I have had a E5 for a while , I like 700 size Heli flying at low RPM sport and Mild 3D , is it possible and good option to stretch my E5 to 700 size heli and fly low RPM happy to go 12S or stay with 6S , if so what do I need for stretch and recommendation for motor and pinion will be appreciated.

Regards

[Chuck Bole]

 That's how i fly my E5 super stretch. Use a Scorpion HKIV 4035-560 motor with a 14T pinion and a Tribunnes 200A esc. Not that it needs 200A. It's just what i had and fits nicely. I fly on both 7s and 12s depending on my mood. 

 As far as the parts needed to stretch i installed a 54T /11T tail drive combo from a E7SE or N7. Both use the same gears. The tail is just the boom, torque tube, boom supports and tail control pushrod from a E7se/N7. You could fit a E7/N7 rotor head but flying low head speeds like i do the E5 rotor head works fine. I run 696 mains and 106 tails.
 
320-111H
320-154
315-120 boom
320-500 torque tube
315-117 boom support
315-111 tail push rod

You will also need TT bearings and ends for the TT. Ends for the boom supports, and pushrod.
 
 I fitted a E7 canopy to mine, just to see what it looked like.

chuck

[lae88]

Thank you Chuck, I suppose I also need 5mm adapter for rotor head to use 690 blades ( 310-540 ) , could you please advice what RPM you flying at or what is a nice low RPM without causing issues

[lae88]

I understand that the headspeed would be the function of battery cells say we go 12S , the main gear to pinion ratio I want to keep the 119 main gear and the motor KV so may be get gear ratio of around 10 for low rpm flying so use a 12 pinion and get motor with suitable KV to suit the low RPM ( around 1500 ) flying, also speed up the tail as adviced, just need to come up with suitable motor KV for 119/12 and 12S ?

Regards

[lae88]

Despite the fact that is very difficult to get Synergy part in UK I got my E5 stretched to 700 got a HK 4035-450 motor  for it flow it yesterday at 1500 RPM I think can do at least 8 minutes with two 6S 5000mah batteries the heli weight is 7.35 Lbs without batteries but I think I can get is a bit lighter using different ESC , flies a bit different to high RPM 700 but with bit of adjustment will get use to it , so it can be done and it works.

[Chuck Bole]

 Nice!
Sorry i didn't get back to you sooner.  I was going to suggest something in thew 400 Kv range.
Sounds like a success.

[lae88]

Thank you I was looking for 400KV motor but could not found anything here which is around 50mm outside diameter to ensure it fit in the frame, I have flown again today the collective reaction is different to normal RPM I have increased the pitch to 14 degrees just need to get use to it , I got 10 minutes today flying sport mild 3D with 30% left in 5000mah batteries , it is amazing that by having a light heli and lowering the RPM to 1500 how much this reduces the battery consumption ,  anyway good modification at it works which is positive point for Synergy helicopters. 

[Chuck Bole]

 Good to hear you are happy with it. I "cheat" as Gary says and just use the same setup, motor and gearing wise. And just reduce the number of cells to get the lower head speed. Speaking of which look up Gary Wright. He's been doing the low head speed flying for a lot of years . He is a wealth of info on the subject. I believe he is flying a E5 super stretch as well.

https://www.helifreak.com/member.php?u=7001

chuck

[lae88]

After playing with various servos, ESC and blades I got the ready to flight weight without batteries of heli to 3100 gram ( 6.84 pounds ) I now get nearly 14 minutes flying at 1500 RPM as my brain goes to neutral after 6 minutes flying I get two 6 minutes flights easily with more than 20% left in the same batteries, thanks to Matt I now have some more spares so can fly the heli a bit more , happy days