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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › Do I have enough motor to upgrade 830mm to 1000mm Main Blades
05-31-2015 03:05 AM  3 years agoPost 1
Aerial Pros

rrNovice

Delhi, New York, USA

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I am running an Airstar Mongoose with a 290 motor that Hanson tweaked up with a heavy duty clutch. I located a longer tail boom and belt. My A/P Heli weighs in at 33lbs. Any info would be appreciated. I am also running DJI Ace Waypoint.

Delhi, New York 13753

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05-31-2015 03:08 AM  3 years agoPost 2
turboomni

rrProfessor

East of the Equator

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What is your gear ratio and do you have any other gear ratio options??

Setup is everything, All my heli's can fly far better than I can pilot them

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05-31-2015 03:09 AM  3 years agoPost 3
Aerial Pros

rrNovice

Delhi, New York, USA

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9:1

Delhi, New York 13753

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05-31-2015 03:16 AM  3 years agoPost 4
Aerial Pros

rrNovice

Delhi, New York, USA

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I don't know if I have any other gear options. Airstar International communication line is not an option.

Delhi, New York 13753

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05-31-2015 03:31 AM  3 years agoPost 5
turboomni

rrProfessor

East of the Equator

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9:1 ,,Ok with the 830mm blades what head speed or engine rpms were you running? And was there a problem with this setup pulling this much weight ? Also how much pitch were you running?

Setup is everything, All my heli's can fly far better than I can pilot them

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05-31-2015 01:23 PM  3 years agoPost 6
Aerial Pros

rrNovice

Delhi, New York, USA

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Head Speed is approx. 1330-1400rpm. My Heli weighed in at 28 lbs. Never had a problem with 830mm Blades or Heavy Duty Clutch. I just added a bigger battery & electrical box and I am also in the process of adding aux. gas tanks which will bring my total weight over 38lbs. I test flew heli with current increased weight at 33 lbs. It flew ok. Just wondering what to expect at 38lbs? I don't know what pitch I am running. I also would like the 1000mm blades in case of an auto rotation.

Delhi, New York 13753

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05-31-2015 01:48 PM  3 years agoPost 7
geomecc

rrKey Veteran

Long Island ,NY

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what u have to figure out how much is the recommended head speed for those blades then make sure your engine speed is in the recommended speed.

R I P Roman Jr. Team SKOOKUM SRW EFC

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05-31-2015 01:51 PM  3 years agoPost 8
geomecc

rrKey Veteran

Long Island ,NY

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so if ur normal hs now is 1400 at 9:1 that puts u at 12.6k engine rpm. 1000mm head speed is about 1200 max I think

R I P Roman Jr. Team SKOOKUM SRW EFC

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05-31-2015 01:51 PM  3 years agoPost 9
geomecc

rrKey Veteran

Long Island ,NY

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u would need a gear ratio around10.5:1

R I P Roman Jr. Team SKOOKUM SRW EFC

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05-31-2015 02:09 PM  3 years agoPost 10
Aerial Pros

rrNovice

Delhi, New York, USA

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What is the correct process for changing the gear ratio? I am currently running a 40tooth pully on my transverse shaft which is belt driven by my motor. Do I look to change that gear?

Delhi, New York 13753

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06-01-2015 12:19 AM  3 years agoPost 11
RajSingh

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Fresno, ca usa

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Gear ratio
Try east coast vario scale helis for a pulley other than 40 T

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06-01-2015 02:38 AM  3 years agoPost 12
Aerial Pros

rrNovice

Delhi, New York, USA

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Ok-I will give Joe a call tomorrow. Appreciate all the help. 10.5:1 is the ratio I will use. Any advice on the 290 motor- is it going to be enough to handle the 1000mm Blades? Has anyone started out with 830mm and moved up to 1000mm. Is there going to be a noticeable change in the way the heli will fly?

Delhi, New York 13753

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06-01-2015 03:07 PM  3 years agoPost 13
turboomni

rrProfessor

East of the Equator

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I would think you should find out what head speed the new blades requires for your load . Maybe Joe can fill you in. Then see if there is a gear ratio available to keep your 290 smack in its power band.
My guess that would be depending on mufflers between high 11000's to 13,000 rpm's which is the area you have been running it at if I remember correctly.
You could also run this question in the scale forum too and see what the guys head speeds with 1000mm blades are.

Setup is everything, All my heli's can fly far better than I can pilot them

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06-01-2015 08:09 PM  3 years agoPost 14
RM3

rrElite Veteran

Killeen, Texas - USA

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I think engine wise you getting close to the limit if you are running a stock engine and high capacity stock muffler especially pushing 33lbs total. If it were modded for more power at the operating RPM for your setup of 11,500 and your were running a performance exhaust you would be safer IMO.

remember just cause it can lift that much weight does not mean the heli is safe, it has to be able to provide enough power to get out of trouble if that ever happens.

Now as for the blades I assume you are using asymmetrical industrial blades? so my guess is that you really need to check with the manufacturer and see what their max is and work you way to no more than 75% of that to stay safe. industrial blades do not have the same performance standards as do 3D quality blades.

also keep in mind that you are now loading the frame more so your going to need more tail power to keep it in line as well.

have you considered trying to go with lighter camera gear?

showing a preference will only get you into trouble, 90% of everything is crap...

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06-01-2015 09:11 PM  3 years agoPost 15
Margaritaman

rrApprentice

San Dimas, CA. USA

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Just replace the pulley under the main shaft with a larger pulley.
http://sdp-si.com/eStore/Catalog# , and order a matching belt. The only thing you'll need to do is enlarge the hole on the pulley to 8mm. I use my lathe to ensure the hole remains centered.

I have an electric Airstar that I've tweaked the headspeed a bunch. And two Mongoose gassers too. Please give me all of your pulley/gear (four of them) counts and I'd be happy to calculate some options for you. You'll just need to tell me your desired headspead. Leave the motor rpm alone so its operating in its powerband.

And yes, you're motor can spin 1000's.

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06-01-2015 09:55 PM  3 years agoPost 16
Luis104

rrApprentice

Caracas / Venezuela

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go for it no problem with that engine and gear ratio.

I made a 800 conversion to a XL 1005 with an old Zenoah 231 and 6.4 gear ratio, now the heli can fly a llot better than it did with 700 blades

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06-01-2015 10:54 PM  3 years agoPost 17
Aerial ProsrrNovice - Delhi, New York, USA - My Posts: All  Forum  Topic

Appreciate all the help. This is a photo of the heli before I installed my new battery box and added my Aux. Fuel Tanks. I am happy to hear that my motor will handle the 1000mm blades, and yes I do understand that if something goes wrong I will be correcting with additional weight load factors etc. I know this all to well being a full size twin engine pilot. I have relocated my new battery box that I fabricated in between my black landing skids removing it from the top of my tail boom. My friend Raja warned me many times about a possible tail boom strike. Did I listen-Nooooo! It is moved now, after second tail boom strike! It is now on a movable Carbon Fiber Tube Slider so when I change camera gear I can relocate battery box by sliding it forward or backward to maintain a perfect CG. I am test flying everything with my 830mm blade setup currently. Once I get everything completed on my build I will send my motor to Al Chinelli from Hansen Motors for him to upgrade my 290 to a 300. Then my buddy Raja will break it in for me! Once motor is broken in I am switching to the 1000mm Blade and longer tail setup. I am taking notes on all of the comments and really appreciate all the help. Everyone has contributed answers to questions that were very important and also to questions I didn't think of. I should be done with my build next week. Any additional comments will also be appreciated!

Delhi, New York 13753

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06-02-2015 04:19 AM  3 years agoPost 18
Margaritaman

rrApprentice

San Dimas, CA. USA

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Wow, that's a whole lot o' gear!

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06-02-2015 11:59 AM  3 years agoPost 19
Aerial Pros

rrNovice

Delhi, New York, USA

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Yeah! Too much Gear! My new rebuild has the Aux. Fuel Tanks and is about 33lbs. I estimate with full fuel I will be at 38lbs. 2.5hours of flight time. I am also upgrading from DJI Ace One to DJI Ace Way Point.

Delhi, New York 13753

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06-02-2015 05:21 PM  3 years agoPost 20
RM3

rrElite Veteran

Killeen, Texas - USA

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yeah your definitely gonna need that high performance 30 to deal with the 38lbs and still have enough power to get her out of trouble if that happens.

I will add that at 38lbs with 1000mm blades... it still aint gonna auto very well.

showing a preference will only get you into trouble, 90% of everything is crap...

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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › Do I have enough motor to upgrade 830mm to 1000mm Main Blades
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