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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › What Engine RPM Are You Running?
09-18-2018 02:37 AM  83 days agoPost 1
wjvail

rrKey Veteran

Meridian, Mississippi

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Please post what gearing, head speed and engine you are currently using. Or just post what engine RPM you're at.

Lately I've begun to wonder if OS's recommended RPM for their 1.05 is optimal. Recently I've let the headspeed on some of my models creep up where the engine might be running closer of 17,000 or 17,200. Frankly, the engine seems very happy.

Any thoughts? I was just wondering where other folks are...

700XN - 2,050 head speed. 8.23 gearing. OS 1.05 @ 16,871.
TSA 700- 2,000 head speed. 8.4 gearing. OS 1.05 @ 16,800.

"Well, nothing bad can happen now."

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09-18-2018 06:07 PM  82 days agoPost 2
datidun

rrElite Veteran

N Ireland

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Trex 600/Hyper.50/2050 hs
Trex 600 Hyper.55hz/2050 hs
Gear ratio 8.5

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09-18-2018 08:43 PM  82 days agoPost 3
PaulBowen

rrKey Veteran

Victoria, Australia.

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Optimal for what exactly?......

Hirobo Freya 7.92 ratio with OS105HZ-R

11088 on the engine gives an optimal for me 1400rpm

Quite, manoeuvrable and low fuel consumption.

Futaba T18SZ, Hirobo fanatic!

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09-18-2018 11:15 PM  82 days agoPost 4
wjvail

rrKey Veteran

Meridian, Mississippi

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PaulBowen
Optimal for what exactly?......
PaulBowen
Quite, manoeuvrable and low fuel consumption.
That is something of the point of this thread. I'm curious what others are doing. I too have helicopters set up to run similar to your Freya. As we talked about in another thread, my X-Cell SE is 7.75 and I fly it at 1,400.

I've only recently started running my 1.05 at above what is published as its peak power. My newest models are my TSA and 700XN and their construction is far more robust than my older Tempests. They seem to easily handle head speeds above 2,000. The 1.05 seems to be just as happy above 16,500 as it is below 13K and I wondered what others are doing.

"Well, nothing bad can happen now."

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09-21-2018 11:33 AM  80 days agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Those are quite high gear ratios so the motor can rev higher and more easily.

Some mufflers will also be happier at higher rpm than others.

I personally shoot right for the engines max power output as stated by the manufacturer as I cannot dyno the engines myself. I find that if I rev the engine too hard it's great for fast popping type moves but anything more and there is too much variation in head speed (unless the gear ratio is on the high side). Helicopter engines are designed for torque at lower rpm's and leaving more head room makes the head speed more consistent.

It is also much more important to make sure everything is balanced if you plan on running higher rpm's.

60% of the time, it works every time!

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12-01-2018 04:42 PM  8 days agoPost 6
Ken Filloon

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Highland, Michigan

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I wouldn't run them over 16,000
Save yourself some money on engine and heli maintenance

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