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05-30-2012 11:28 PM  6 years agoPost 1
ebonicrobot

rrApprentice

East Bay, CA

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Ok guys I've been combing through this site gathering information on gassers. I want one so bad so i decided to use one of the helis I already own. Its going to be either my Stratus or my TZ90. Now I have read about the Spark conversion from Helibug, it all seems great but it looks like the only down fall is the gear ratio. The lowest possible ratio I've seen is 7.75. The site even says in order for me to do some type of 3D ill have to get the RC23 engine since its so smooth. Now the TZ90 has a 6:5 gear ratio. The only problem is I never seen anyone flying one or even see a video on youtube. They're a couple of gasser TZ90 videos but all seem to be a custom build kit. What do you guys think?

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05-31-2012 12:57 AM  6 years agoPost 2
rbort

rrProfessor

Franklin, MA - USA

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In a couple of weeks
I'll be with you there in Newport News at the funfly listed under events here. You can check out my Spectra-g with the spark conversion and RC motor. I'm running 7.08 gear ratio on it, can also be 7.15 with the stock gearing.

Carey from Florida has a stratus converted to a gasser and may be able to tell you how to change the gear ratio in yours to suit.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3288 flts
Whiplash V1-2 Hanson 300, 1570 flts
Whiplash V2 Hanson 300, 402 flts

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05-31-2012 01:19 AM  6 years agoPost 3
ebonicrobot

rrApprentice

East Bay, CA

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Cool thanks for the info.. Looking forward to seeing you their.

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05-31-2012 04:05 AM  6 years agoPost 4
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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HB also has a TZ conversion kit. I'm sure the quality of the conversion itself is very good. As to the quality of the TZ model, I can't speak to that.

As for your Stratus, it depends on which version you have as to how flexible it is. The older version had slots for the clutch block positioning and used ratio plates to set the mesh. It would support a 7.75 ratio which is too short but its better than the 8.x options. The newer one just had holes drilled in the frame so the only way to use the taller ratio is to grind the holes. I don't think you can get either of them to 7.15 or 7.08, there isn't enough frame material around the lower clutch bearing to bolt onto.

Proprietor - Gas Powered Helicopters

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05-31-2012 08:59 AM  6 years agoPost 5
ebonicrobot

rrApprentice

East Bay, CA

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Carey,

I have the older version with the plates. So i can get to 7.75 but thats the best I could do. With that ratio I would need the motor spinning between 13500 -15000 rpm to get a decent head speed. Can a stock RC23 handle that? My goal is to use it for sport flying with very mild 3d not smack.

The TZ90 is actually made with pretty good material. I never had a problem with bad bearings or poorly machined parts. JS Models part quality is at par with Align... actually slightly better. Still doesnt compare to the MA stratus

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05-31-2012 11:16 AM  6 years agoPost 6
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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you're not gonna have any attractive power with an unmodified motor at those RPMs

but if you're insistent upon using a stock motor, use the 22.5 (230/240), its the best balanced of the stock configs.

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05-31-2012 12:59 PM  6 years agoPost 7
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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IMHO, don't compromise on gear ratio, it can make a big difference.
If you can't get the right gear ratio, consider alternative heli's.
It is not fun to invest lots of time and $$$ and end up with something you are not happy with. It comes down to what your expectation are for the flight characteristics.

1800-1900 is fine for cruising around. They really wake up at 2100 or higher head speed. I enjoy flying a variety of HS, depending on the day.

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05-31-2012 01:46 PM  6 years agoPost 8
ebonicrobot

rrApprentice

East Bay, CA

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Good point fastflyer. Might just go with the TZ, less hastle.

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06-23-2012 01:22 AM  6 years agoPost 9
Mike545

rrVeteran

gettysburg, pa

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I just bought a TZ gasser, let u all know how it is

"always feel thankful..... never entitled"

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08-13-2012 11:36 PM  5 years agoPost 10
Mike545

rrVeteran

gettysburg, pa

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I have the TZ 90 with helibug. I flew mine today. It flys great!! no muss or fuss. flown around 15 min on tank. plenty of power. I had MinAir stuff, loved them way to expensive. this is a dream. Id stick with this for a long time. extremely affordable

"always feel thankful..... never entitled"

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08-13-2012 11:47 PM  5 years agoPost 11
ebonicrobot

rrApprentice

East Bay, CA

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That is freaking awesome.... ordering mine soon. Is it pretty straight forward build?

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08-14-2012 01:11 PM  5 years agoPost 12
Mike545

rrVeteran

gettysburg, pa

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To be honest I got mine rtf. But you can see its very easy and laid out nice. The use of the Rc engine is nice, really moves air and stays cool.

"always feel thankful..... never entitled"

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