Synergy N5C Flybarless Belt Drive Kit for a first nitro?

[rimaarts]

so guys.. 2 questions...

while spinning head by hand i noticed  that tail belt goes to far right side, half way under support pulley... but when i spin the head other way, it returns to normal...


what could cause tail belt riding in very far right side of tail pinion? half way under support bearing (pulley?)? im guilty of tightening set screws with green loctite until they strip (after horror stories about pulley slipping and something) so i would like NOT to disassemble tail shaft/pulley/hub.... any other options to try to check before jumping on TT conversion kit? i wanted to put it after first crash, not before first flight lol...

and i know and would want hatori sab-55... but what you guys think about 90$ NIB os powerboost 2?

[Darren Lee]

while spinning head by hand i noticed  that tail belt goes to far right side, half way under support pulley... but when i spin the head other way, it returns to normal...

If the belt is riding down the center when you spin it the correct direction, it's all good.  I seem to remember mine doing the same thing, but only when the head was spinning backwards.

[Rodney Kirstine]

One thing to check is to make sure that the lock nut for the belt idler pulley is not over-tightened.  I had seen my belt do that when I had the idler too tight.

That's a good price for that pipe.  I don't have any first-hand experience with it but have read positive reviews.  I have read that it's a re-badged Funtech B320.  I'm running a Funtech B323 on mine and really like it.

[rimaarts]

One thing to check is to make sure that the lock nut for the belt idler pulley is not over-tightened.  I had seen my belt do that when I had the idler too tight.

That's a good price for that pipe.  I don't have any first-hand experience with it but have read positive reviews.  I have read that it's a re-badged Funtech B320.  I'm running a Funtech B323 on mine and really like it.

thanks! i would prefer hatori,but since ralph gave me STELLAR deal for synergy e7se, and i want to get engine and pipe for my n5c... rest of december ill have to live from quick noodles... i was planning on bigger heli after i finish my n5c, but i just couldnt resist synergy e7se for under 700$

[rimaarts]

so... got myself a set  of rails.. 606 and 96mm... and got a headscratcher... my belted tail is spinning like a tt tail (rail lettering goes to inside, not outside...) i think i just twisted the belt other way, no? it is not NESSECARY to correct it, no? especially if after finishing 7se or after first crash i might put tt upgrade...

so i guess now its official! i need 4 more things to finish my n5c! pipe (hopfefully sab-55), fbl (most likely brain), fuel pump (dubro?) and couple galons of nitro (i think byron) !

oh.. p.s.  i had some metal shims which came in kit with tail blade screws... they fit perfect for 96mm blade spacing in tail grips, but seem kinda... small-ish (a tad smaller than grip area) is it ok to use them?

[flyalan]

Yes you twisted the belt the wrong way.  You can leave it as is but I would go head and fix that...

Yes the blades washers you have are fine...

Cheers

Alan

[rimaarts]

apart from possibly having to swap out/reverse some settings in fbl, why would you fix that?

[flyalan]

Why not???  All you need to do is rotate the tail box in the correct direction. Change your servo direction. 

Personal preference.  I would rather build the heli as designed... And yes the tail blades do rotate the other direction on the TT version.  So what ever floats your boat..

Cheers

Alan

[rimaarts]

guys.. i have been thinking... os 55hz-h has maximum practical rpm range of 17000  that gives max headspeed of 2000 (17000/8.5)... many posts here is that you guys run up to 1950 (or around 2000) headspeed... that makes me think... what is the point of governor in here if it does not have any overhead? i know castle governor needs around 300-400rpm headspeed...

[Darren Lee]

1950 is my idle1 headspeed and is rather low.  2150 is where she really comes alive.

Nitro governors don't need headroom in the same way electrics do.  17000rpm is where the engine makes max torque I believe.   Setting a headspeed for slightly higher puts it in the power band when loaded heavily.

[Rodney Kirstine]

O.S. actually states a max practical RPM of 20,000 which translates to around 2,350 RPM head speed.  I have mine governed at 2,150 RPM head speed (17,850 engine RPM) in IU2.  The engine will actually turn quite a bit more than 20,000 RPM if you just open it to WOT and let it run.  I had entered the gear ratio incorrectly in my governor once and that thing was flat screaming.  I tach'd the head speed and, if I remember correctly, it was turning at around 2,600 RPM (22,100 engine RPM). 

[Rctintin]

Thank god you were not lean!!

[rimaarts]

O.S. actually states a max practical RPM of 20,000 which translates to around 2,350 RPM head speed.  I have mine governed at 2,150 RPM head speed (17,850 engine RPM) in IU2.  The engine will actually turn quite a bit more than 20,000 RPM if you just open it to WOT and let it run.  I had entered the gear ratio incorrectly in my governor once and that thing was flat screaming.  I tach'd the head speed and, if I remember correctly, it was turning at around 2,600 RPM (22,100 engine RPM).

20000 for os 55-hzr... 17000 for hz-h... (Unregulated...)

[Rodney Kirstine]

They show almost identical specs, including rpm ranges.

http://www.osengines.com/engines-heli/osmg1957/index.html

http://www.osengines.com/engines-heli/osmg1955/index.html



Sent from my MotoX via Tapatalk2

[rimaarts]

strange... fast lad shows different rpm ranges... but ok... thanks!