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HelicopterMain Discussion › Bench Testing
01-18-2017 07:18 PM  5 months agoPost 1
CostaRicaHeli

Senior Heliman

Costa Rica, Central America

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I have read a lot about people testing their helis on the bench with the blades off in order to see if governors, etc. are working as intended. Aside from being VERY careful when doing this because of the high RPMs, doesn't this present problems for the motors or ESCs as they are run without any load? Is it ok to test everything on the bench? I would prefer just to take off the motor belt IMO.

I'm almost ready with my Black Thunder 700 but want to make sure everything is working as it should before the maiden.

Thanks!

Franz

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01-18-2017 07:39 PM  5 months agoPost 2
Pistol_Pete

rrProfessor

Seffner, FL

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doesn't this present problems for the motors or ESCs as they are run without any load?
Absolutely no problems unlike wet fuel engines.
However, your AMP readings in a DATA LOG will be very misleading.
I would prefer just to take off the motor belt IMO.
If it makes you feel safer by all means but again, absolutely no problems unless you did a bad build and or did not wait for loctite to dry.

The downside is you will not be able to get a feel for excesive vibrations in the boom if there is a tail issue.

The upside is if there is any unusual vibrations, removing the belt isolates if its coming from tail or main drive.

Either way, just don't be in line with the spinning grips, just as you would not be inline with a spinning airplane propeller like some guys at my club do.

Enjoy your new bird.

~~Enjoying the hobby one flight at a time~~

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01-18-2017 07:46 PM  5 months agoPost 3
ICUR1-2

Elite Veteran

Ottawa, Ontario

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I would not spool up a heli on the bench regardless of the circumstances.

I think something could happen if you spun it up to full throttle as I have seen for myself in the past. It can over speed the drive train and the governor just ends up pulsing or does weird stuff.

spending time, paying attention

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01-18-2017 08:00 PM  5 months agoPost 4
Andy from Sandy

Elite Veteran

Bedfordshire, UK

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One other thing to do if the fbl controller is running and set for HH is to remove the tail control rod.

The tail will self centre. If it doesn't then it is a good indication that you have something wrong. It usually manifests itself as very high vibration.

I've never had over speeding as the governor has worked perfectly without the main blades on the bench.

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01-18-2017 10:16 PM  5 months agoPost 5
Dan Minick

Key Veteran

Columbus, WI

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If you feel confident as a builder there is no need for bench testing. Check and recheck. Fly

Team Synergy, Team FBL Rotors---Formerly Dyecocker1-------if its not broke...it will be!

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01-18-2017 10:29 PM  5 months agoPost 6
mike123

Heliman

Brandon MS

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Not the best idea, I sold one of my Min Air 90s to a guy he couldn't figure out the gov so he ran on the bench and about killed himself. I'm fairly sure he still has the scars from that mistake. If unsure of your build take it to the field and have someone take a look i'm sure someone will help.

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01-19-2017 04:41 PM  5 months agoPost 7
CostaRicaHeli

Senior Heliman

Costa Rica, Central America

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Thanks!

Thanks for the replies and advice. I have no concerns about the quality of the build. However, the governor settings in the Brain and ESC, etc. sort of give me the need to try it out on the bench to see if everything is working properly before I fly it (soft start, TH, governor, etc, etc.)

I tend to agree that maybe its better on the field than having a 2000 RPM beast revving in front of you.

Thanks again!

Franz

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01-19-2017 04:55 PM  5 months agoPost 8
Pistol_Pete

rrProfessor

Seffner, FL

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For those that might have missread his post, it's electric and he will remove the blades.
doesn't this present problems for the motors or ESCs as they are run without any load?
NO it does NOT present ANY problems. Technically they will be a small load once motor is in place with pinion driving all those gears and belts, etc..

Extra questions not asked.
Can you run the motor without a pinion at full speed as in no governor? YES Just like we do on planes with no governor and no propeller.

Does it overspeed? NO

Will it damage anything? NO

Can the motor pulse with governor? YES if you have a bad ESC, incorrect setting or a bad sensor. Otherwise, NO

Best to find out if there is a manufacturing issue on the bench than in the air.

For those stating otherwise, please share where this information can be found.

@Mike123
I sold one of my Min Air 90s to a guy he couldn't figure out the gov so he ran on the bench and about killed himself.
Was this electric with blades removed?

EDITED
You can do it on the floor versus on the bench...sort of speaking.

~~Enjoying the hobby one flight at a time~~

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01-19-2017 05:08 PM  5 months agoPost 9
Heli_Splatter

Elite Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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I will run up my builds in the shop, but never full rpm. I would guess that I do around 25%. I feel that lower speed will indicate most problems.

I do full speed testing at the field and am very gentle with a new build. Hovering for a while, then slow forward flight adding more as my confidence builds. It is pretty much the same after every modification.

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01-21-2017 04:17 PM  5 months agoPost 10
wc_wickedclown

rrProfessor

long beach calif

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I've been bench testing for years.

tho it is not recommended.

it can be dangerous to those who dont know what they are doing.

most important tip i could give you if your doing it with blades on
make sure you keep zero pitch threw out your range for - to +

Insha Allah made in america

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01-21-2017 11:54 PM  5 months agoPost 11
Dan Minick

Key Veteran

Columbus, WI

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most important tip i could give you if your doing it with blades on
make sure you keep zero pitch threw out your range for - to +
Or, ya know, just NEVER!!!!! bench test with blades on. Like EVER

Team Synergy, Team FBL Rotors---Formerly Dyecocker1-------if its not broke...it will be!

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01-22-2017 12:17 AM  5 months agoPost 12
JuanRodriguez

Elite Veteran

The Villages, Florida

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Yup....

Telling someone that it's "ok" to bench test a heli with blades on is simply irresponsible !!!

Been there, done that and old enough to know better.....

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01-22-2017 12:24 AM  5 months agoPost 13
CostaRicaHeli

Senior Heliman

Costa Rica, Central America

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Dont intend to

Been bench testing today without blades, no problems. Being very careful. Been flying nitro for 18 years. I would never bench test with blades on. I'm relatively new to electrics, hence the original post.

Thanks for all the advice.

Franz

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01-22-2017 03:55 AM  5 months agoPost 14
iyoy

Veteran

Bacolod City, Philippines

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Bench testing NO Blades

I'm just a newbie with electric but I would certainly NOT have anything to do with doing any sort of bench motor testing with the blades on. I do test the motor on the bench or floor WITHOUT blades. It's rather satisfying and to a certain extent checks some aspects, to safely identify and rectify some build errors prior to actual flight.

iyoy

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01-22-2017 03:59 PM  5 months agoPost 15
Andy from Sandy

Elite Veteran

Bedfordshire, UK

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There is a CD or book showing a guy wearing a crash helmet holding a model above his head.

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01-22-2017 04:54 PM  5 months agoPost 16
JuanRodriguez

Elite Veteran

The Villages, Florida

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Yup, I think it was in Ray Hostetler's book ! Not sure on spelling....

Been there, done that and old enough to know better.....

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01-22-2017 06:21 PM  5 months agoPost 17
KJH

Senior Heliman

Interlochen, MI

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If you're going to hang on to a heli with spinning blades, it's much "safer" outside....

The above picture is in Dieter Schluter's book, "Radio Controlled Helicopter Manual"

Kids, don't try this at home or anywhere else.

-Kevin

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01-23-2017 12:10 AM  5 months agoPost 18
wc_wickedclown

rrProfessor

long beach calif

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Kids, don't try this at home or anywhere else.
kids adults either smfh .

what wrong with some people he could have seriously got hurt

Insha Allah made in america

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01-23-2017 10:24 PM  5 months agoPost 19
rcflyerheli

Key Veteran

Granbury, TX USA

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I've told this story before, but it is still as valid today as it was 7 years ago when this happened.

I was just getting started in Helis, and had built my first one, a Trex 500. I have been flying planks over 45 years, and as a kid, watched my Dad crank up an .049 motor holding it in his hand, so I suppose I had never learned how to respect these things. After all, how much power can a 500 sized motor generate? Well, I learned first hand.

Got everything installed and assembled, and decided to do a test run on the bench. The thing ran fine, and I was even smart enough to keep just a tad of negative collective on the main blades. I had cleared everything off the bench that might get blown around, but I didn't take into consideration a set of full sized plans for a Pica Duellist that I had pinned to the wall.

Those puny 425mm blades sucked the plans right off the wall and made confetti all over my shop in the space of one nanosecond. Seven years later, I am still finding fingernail sized pieces of those plans in some of the most unlikely places.

Since that time, number one rule is no battery EVER/NEVER gets plugged into an ESC with blades on the heli.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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01-24-2017 12:17 AM  5 months agoPost 20
JuanRodriguez

Elite Veteran

The Villages, Florida

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kids adults either smfh .
what wrong with some people he could have seriously got hurt
"Those people" have the same mentality as those that would suggest that "if you're experienced", it's OK to "test run a helicopter on the bench" while the blades are still on the heli !!!

Been there, done that and old enough to know better.....

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