7HV gearing question

[scoio]

Being flying my 7HV V2 with Align 510Kv and 13T slant on 12S.
Wondering if would be more efficient to gear up to 14T
At the moment flying @ 1800 -1900-2000

Thanks

Chris

[Rob43]

I actually think 14 would be going the wrong way. You might already be a touch overgeared for 1800. I run the 12 for the same range, and its about right. I could even drop to 11 and still pull the 2000 when wanted and be most efficient for the 1800 end. I am running the K Jive which likes a good bit of head room.

[scoio]

Thanks Rob, I am reviewing it, getting the Chronos upgrade and finally installing an ikon on it, running internal gov. Planning to go 710 mains too, now running stock 700.
I ll be getting new packs, and no more swapping between 10 and 12S....is bit a mess with gain settings...
I have a 12T somewhere, once the packs will be here will give a try with the 12T.

[Rob43]

Maybe check with Jmackey on running 710's. He's done it alot. Specifically, I know the 716's. I don't recall what the limit on tail blade size is with 710's, but there is a limit.

[jmackey]

Here you go:
https://www.helifreak.com/showpost.p...6&postcount=16

Not sure what your flight style is like, but if you push it hard, bigger main blades will extract huge amps from your power system. I logged over 350amp spikes when I was running Rail 716's (719mm actual length) at 2200 HS with 14T pinion. TP70C G8's came down hottt (>65C) every hard flight.

I'm running Zeal 700/115's now with 13T at 1950. Nice balance of collective response and flight time. Packs love me again

[crickr1]

Wondering if Chronos head is slightly different in size from the 7hv?
Measured bolt head to bolt head and came up with 32 7/8" (835mm)
The head is 118mm bolt to bolt C/L With 835mm can you run 710s with 115s?
At 835, that is dead on, should there be some extra clearance?

I have set of Radix710 and Edge 713, as well as Rail 106 and a set of stock 115 tail blades so wondering about the combinations?

Thanks

[jmackey]

710+115=825

That should be just fine.

[Rob43]

I am finally going to try the Compass 700's this spring. I will run their carbon 115's out back. Had been running Edge SE693 and SE115 and liked the pairing. Before that, is was Rail 696 and Rail 116 for a very long time.

[quinn]

I recently put my edge 713's on for a few flights. I've been pushing it harder than the last time I flew those blades. I was doing a high speed funnel and heard a nasty noise. The tails and mains were missing a bit off the corner. Looks like 713 and 115 are right at the limit and will touch if you push it hard in certain maneuvers. If I remember correctly, the edge 713 were actually more like 716mm when I measured. I would say 710 and 115 is definitely safe.

[Rob43]

Originally Posted by jmackey

Here you go:
https://www.helifreak.com/showpost.p...6&postcount=16

Not sure what your flight style is like, but if you push it hard, bigger main blades will extract huge amps from your power system. I logged over 350amp spikes when I was running Rail 716's (719mm actual length) at 2200 HS with 14T pinion. TP70C G8's came down hottt (>65C) every hard flight.

I'm running Zeal 700/115's now with 13T at 1950. Nice balance of collective response and flight time. Packs love me again

I could be wrong, but I theorize that maybe the Koz pulls more amps holding headspeed than a comparable setup with a Jive. I think maybe the Jive allows some lag that the Koz doesn't. Not sure, but it might explain also the short lived one-way phenomenon...???

[simplechamp]

Shoot, after reading this thread I'm questioning my purchase of Rail 716s today.

Are these going to be unsafe to fly with 115mm tails?

EDIT: Just looked at jmackeys link, looks like this isn't going to fly. And this was at the Toledo show today, Experience didn't have a receipt printer going. He said he could write one up by hand and I stupidly said naw don't need it.

Well if anyone has a set of Rail 696 they want to trade for a brand new set of 716s to try on something else or run with 105/106 tails send me a PM.

[Rob43]

I tried out the Compass 700's with Compass 115's. I had been flying Edge SE693 and SE115. The tail wasn't at all happy with the 700's. I believe they are enough different in many regards that I would have needed some Vbar tuning, and they'd be fine. But, overall, I didn't care for them. Edge back on, and all is good now.