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Logo 690 › Stock 690sx speed runs with Mikado GPS
03-14-2015 02:21 AM  3 years agoPost 1
KevinB

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Saskatoon, Saskatchewan, Canada

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Not bad On 3 year old batteries too.....

KevinB

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03-14-2015 04:36 AM  3 years agoPost 2
Raptorz499

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NJ

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What is your setup in the heli...also what pitch and headspeed?

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03-15-2015 07:02 PM  3 years agoPost 3
Freeskiken

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Edmonton, Alberta, Canada

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Wow ! What motor are you using ?

Logo 600SE, 500SE. Synergy E7SE, E5S, 516, VControl, Neo

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03-15-2015 08:30 PM  3 years agoPost 4
KevinB

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Saskatoon, Saskatchewan, Canada

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Stock Scorpion 370kv with 15t pinion. Helix 695 mains. 2000rpm and 14° pitch +/-
KevinB

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03-16-2015 11:26 PM  3 years agoPost 5
Andy from Sandy

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Bedfordshire, UK

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It looks like you have it set on kph so that is around 93 mph.

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03-17-2015 12:44 AM  3 years agoPost 6
Flying Brian

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St. Clairsville, Ohio

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Was this speed taking in a pure dive, or with a flat run across the course?

"I just don't Listen" "

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03-17-2015 03:15 AM  3 years agoPost 7
KevinB

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Saskatoon, Saskatchewan, Canada

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Yes.....Canada is metric so it's 150 km/h.

The flight path was an arc starting from a stall turn and hitting max speed on the level parallel to the ground. The average was about a 45 degree descent. It was not straight down or straight level. It would hit the level as it came across in front of me and it sounded like a little race car going by .

The 150 km/h was the best pass of the day. It was easy to get in the 137-147 km/h range. Although, I want to try it again with my newest lipo packs. ( I didn't have them with me on this day ). The ones I used you could hear the rpm loading up at the bottom of the arc because of the voltage sagging under the load. I actually had to back the pitch off at the bottom of the arc with the old lipos.

I'm hoping with my newest lipos to be able to hit 100 mph (161 km/h) at the level and not have to back off on the collective. We'll see once the weather is behaving again.

KevinB

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03-17-2015 03:50 AM  3 years agoPost 8
EEngineer

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TX

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The flight path was an arc starting from a stall turn
Try performing a "1/2 reverse Cuban-8", heading upwind.

I'll wager your speed will majorly increase....

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03-19-2015 07:59 PM  3 years agoPost 9
KevinB

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Saskatoon, Saskatchewan, Canada

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I was able to try my newest batteries today.(got them late summer last year)

Waaaaaaaaahoooooooooooooo !

Got up to 177 kph / 110 mph ! Even keeping it well away from the ground, it still goes by real quick This was more or less level flight. I found anything over about 140 kph, if you pulled the cyclic back at all, head speed started bogging.... so my arcing approach of the previous time out wasn't optimal.

That's good enough. Not going to push the poor 690 any harder. Get back to some normal flying again. I mainly wanted to see what it was capable of........and it didn't disappoint.

KevinB

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03-19-2015 08:09 PM  3 years agoPost 10
Andy from Sandy

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Bedfordshire, UK

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You've got to be pleased with that?

I would think anything over 100mph has got to be good in level flight.

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03-19-2015 08:52 PM  3 years agoPost 11
KevinB

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Saskatoon, Saskatchewan, Canada

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Yes.....I am more than pleased

I was hoping just to break the 161kph/100mph threshold and wasn't sure if the extra jam of the newer batteries would help much. ( they are only 35C packs, so nothing fancy )

With the newer batteries, my first pass was 143kph, second was 170kph, and the third was 177kph. 4th and 5th passes couldn't beat that. Much easier that I thought it would be. I was using the feature on my VControl where it calls out the speed whenever you break the current max speed for the flight.

KevinB

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03-19-2015 09:46 PM  3 years agoPost 12
Freeskiken

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Edmonton, Alberta, Canada

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That is really impressive for a stock machine !! Well designed helicopter.

Congratulations

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03-20-2015 03:02 AM  3 years agoPost 13
Charlie R

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Lafayette Ca

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131 mph ?
Not sure how accurate the gps is .
14 degrees of pitch ,1930 head speed ,tail gain set to 5% (makes a big dereference) 45 degree dive from 750'with a little wind ,12cells.

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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03-20-2015 04:23 AM  3 years agoPost 14
EEngineer

rrProfessor

TX

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Nice improvement on the speed.....did you try the 1/2 reverse Cuban 8(or a split S from a higher altitude?
Not sure how accurate the gps is .
The bit-rate at which the GPS satellites transmit data to the GPS RX's is a 50 bits/second.

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03-20-2015 05:47 AM  3 years agoPost 15
KevinB

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Saskatoon, Saskatchewan, Canada

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No. It was a combination of fresher batteries and flying straight instead of the diving arc I used last time. It was near freezing today (colder than last time). I don't know if that made any difference.

KevinB

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03-20-2015 05:37 PM  3 years agoPost 16
KevinB

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Saskatoon, Saskatchewan, Canada

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Hey Charlie.......Good speed. I don't think throwing a $600 US speed/FAI fuselage on counts as a 'stock' 690 any more though

What does changing the tail gain to 5% do for you? I'm not getting any tail oscillations at speed. Or is it more about allowing the tail to track more like an old rate tail gyro....to reduce yaw drag?

In the spirit of full disclosure, I guess my 690 isn't stock either as I have a KDE tail control and QuickUK tail grip upgrades on mine that takes out all the slop the stock control has. I was never a fan of the single ball in cup tail control. I much prefer the two point fork arrangement that KDE, JR, and Hirobo use.
I'm running a tail gain of 100 and even at the 110mph, I didn't have any tail oscillations that I could hear. I may have to try a few more speed runs to see if reducing the tail gain does anything for my speeds.

On the topic of 'speed', I tried the tail overdrive added in the last firmware update on the 690 yesterday as well. I had the tail at 120 before and it was ok. After enabling the overdrive, I turned the tail rate up to 140 in all banks and gave it a try. That really woke the tail up! I don't want blur piros, but the increase makes it much more lively, while still keeping an 'in control' feel.

KevinB

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03-20-2015 06:14 PM  3 years agoPost 17
Charlie R

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Lafayette Ca

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Kevin
You are right 5% makes it like rate gyro . Tail tracks straight and gives more power to the mail blades as the tail is doing less work .
The way the heli mounts in the body also tilts the main shaft a little more forward and that also helps

Helicopters are a mass of rotating metal fatigue surrounding an oil leak !

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03-22-2015 05:22 AM  3 years agoPost 18
EEngineer

rrProfessor

TX

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I don't know if that made any difference.
Good luck with your quest....keep with your updates.

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07-19-2015 05:09 PM  3 years agoPost 19
KevinB

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Saskatoon, Saskatchewan, Canada

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Well.... with the help of a little wind, Cyclone 695s and some new GenAce 60C lipos, I tried a few more speed runs yesterday to see if I could finally break the elusive 200 mark.

Done!

KevinB

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07-20-2015 04:13 AM  3 years agoPost 20
Freeskiken

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Edmonton, Alberta, Canada

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Wow !!! Congratulations. Incredible

Logo 600SE, 500SE. Synergy E7SE, E5S, 516, VControl, Neo

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