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01-04-2009 02:49 PM  9 years agoPost 1
Pinecone

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Maryalnd

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Along with the heli, any info, comments or opinions between Txic or Hansen modded motors?

Terry
Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

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01-04-2009 04:25 PM  9 years agoPost 2
mcfast

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Quebec Quebec Canada

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There are both very good!

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01-04-2009 05:21 PM  9 years agoPost 3
Christopher J

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Kansas City, MO Californian lost in land of Oz

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I'd lean toward the Toxic and thier warranty doesn't mandate what fuel you use.

Nothing against Hanson, he has a good product as well but since I run white gas instead of regular unleaded my next motor will be sent to Toxic for some modding.

Christopher J
same as I ever was
"Still all set & Flying the original"

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01-04-2009 09:11 PM  9 years agoPost 4
Justin Stuart (RIP)

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Plano, Texas

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There is a new motor coming out to compete with Hanson and TRM, a modified Zenoah G270. Look at the thread entitled "Oh My" to follow the progress. The Zenoah G270 is the same size as the Zenoah G26, but is has some upgrades (such as a 4 bolt head instead of 2 bolt).

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01-05-2009 12:56 PM  9 years agoPost 5
Zman

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Florida

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+ 1

This new motor is getting very close. Besides more power than the modified 260's, a LOT of time and research has been invested in making it vibration free among other things.

Z

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01-05-2009 01:23 PM  9 years agoPost 6
Justin Stuart (RIP)

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Plano, Texas

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I talked with the guy who is developing this motor in December, and he told me that he plans to offer an "all out performance" version with ceramic bearings and other high-end modifications. He told me that he only uses a few parts off the stock G270, so I assume he manufactures the rest himself. I am going to hold off on buying a TRM or Hanson G26 for the Spectra-G I am building because I would rather go with this new technology as soon as it is ready.

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01-06-2009 01:10 PM  9 years agoPost 7
Zman

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Florida

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I should be able to report on this motor soon, it is on its way to me . Talking with him, there is no doubt that he knows how to build an engine! Despite the incredible power, he and Bill has dedicated a ton of time in getting a vibration free engine one step at a time. He ran mine before shipping it out and at 14K, the engine was still smooth. This is very promising to say the least. Will report as soon as I have it in my gasser.

Z

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01-06-2009 04:05 PM  9 years agoPost 8
Justin Stuart (RIP)

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Plano, Texas

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Zman, I look forward with great anticipation to learning of your results. I do not have sufficient experience with heli gasser engines to do the necessary beta testing, so I am relying on others to notify me when all the fine tuning has been completed and it is time to place my order.

I am concerned that with the 710mm main rotor blades I plan to use on my Spectra-G, I may underload and consequently overspeed the engine. The designer (when he emailed me in late December) said he was using (if I remember right) 800mm blades on his Predator. I'm not sure I can fit anything longer than 710mm blades on the Spectra-G without having interference with the tail rotor.

Zman, what machine will you put this modified G270PUH in, and what rotor blades will you be running (along with what gear ratio)? Is 14,000rpm really the expected idle up RPM, or will it be closer to 12,500 like the Hanson G26 3DMax?

I'm discovering that transitioning to a gasser heli has a real steep learning curve to it, but I hope it will be a very satisfying experience when I finally get to see it fly.

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01-06-2009 05:05 PM  9 years agoPost 9
Zman

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Florida

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I am pretty much following Billme's advice from his original testing. It will be on my predator with 720 RT's (same blades bill used on test). I will be running a 6.92 gear ratio and shooting for around 1900-1950 on head speed. With this, Bill was able to pull 13 degrees pitch with no problem on hard climbouts. I know Bill told me that when he went from 710 to 720, it helped a lot (engine wanted to be loaded more). I would think the Spectra could handle 720's but I am no expert on Spectras.
Bill may chime in here if I am off anywhere.

Z

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01-06-2009 09:01 PM  9 years agoPost 10
Billme

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MS

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You will pretty well have to run 720's at 6.9....If you don't want to run so much pitch, then 6.7 at 10 or 11 degs...

The 6.9 is more suited for 3D with 720's.....710s are out of the question for this engine imo....If the Spectra could do 6.7, then you might do 710 at higher pitch setting such as 13 +-

Bill

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01-06-2009 09:19 PM  9 years agoPost 11
rbort

rrProfessor

Franklin, MA - USA

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Do you need to thorttle up all the way?
If you have too small of a prop (710 lets say), then you can add more pitch for more load, or just throttle back some.

More HP will give you less bog and climb at the same rpms at full collective as flight collective with even more pitch. But if you have all the pitch you can and the rotor is already getting too fast, you can just throttle back some.

I use a gv-1 on my Spectra and it does exactly this with my Hanson G26. At full power climbouts if I turn off the gv-1 the rotor actually speeds up on the way up. I can put more pitch in sure, but I feel I have enough and this way with less pitch it will be harder to bog during heavy 3D.

Just a thought anyways!

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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01-06-2009 10:40 PM  9 years agoPost 12
Billme

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MS

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A lot of the scale guys do this also, but we are talking about full performance... Yes it can be done, as with the gov, but you want get the benefit of whats under the hood...

Before, with other engines, over speeding more than the blades needed caused vibration, due to timing.. With this engine, it doesn't seem to be a factor, hence, the reason I give in a little on this subject.....

When you get your engine Raja, you need to try the 720's

Bill

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01-06-2009 11:44 PM  9 years agoPost 13
Justin Stuart (RIP)

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Plano, Texas

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I have a few questions for ya'll.

#1. With 105mm or 110mm tail rotor blades, will 720mm main rotor blades fit on the Spectra-G (with a Tempest head) without interference?

#2. Lots of manufacturers sell 710mm blades, but who sells 720mm blades? I would prefer a set of blades with a lot of white on them, at least near the tips. Any suggestions?

#3. To get a 6.92 gear ratio, the Spectra-G will need both a new main gear and a new pinion gear, right? What will the numbers be for these new gears need to be? Do you think MA will have them available?

#4. Will changing the gear ratio like this necessitate new mounting hardware for the Jewel generator?

#5. I assume this new engine uses a magneto (and not electronic ignition)?

#6. What kind of results do you predict I would get if I use this new engine and 720mm blades with the stock (7.35) Spectra-G gear ratio?

Thanks for your suggestions.

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01-07-2009 12:17 AM  9 years agoPost 14
helicenter

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Winter Haven Fl.

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Spectra G
Thats a good question, I have the 720 Scott Gray blades,the Spectra G and one of the engines on the way, I will build it up and post the details and videos for all to see.

I also have a Hanson pro that we can run.

Zman will have his predator up and running soon.

Doug

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01-07-2009 12:18 AM  9 years agoPost 15
Carey Shurley

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Orlando, FL - USA

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#1. With 105mm or 110mm tail rotor blades, will 720mm main rotor blades fit on the Spectra-G (with a Tempest head) without interference?
with 105mm yes. with 110mm don't think so. I believe there is a 1mm overlap. The Tempest head is 15mm wider on each side than the extreme head. Now, one option is to convert to the Ultimate 3D head (stratus) and you can easily run 720mm.
#2. Lots of manufacturers sell 710mm blades, but who sells 720mm blades? I would prefer a set of blades with a lot of white on them, at least near the tips. Any suggestions?
rotor tech sells 720mms
#3. To get a 6.92 gear ratio, the Spectra-G will need both a new main gear and a new pinion gear, right? What will the numbers be for these new gears need to be? Do you think MA will have them available?
The stock pinion is 13 tooth. You need only change the main gear to 90 tooth to get to 6.92. At worst you'll either need a set of slotted gear plates (talk to Bob) or dremel out the holes to reset the mesh.
#4. Will changing the gear ratio like this necessitate new mounting hardware for the Jewel generator?
Raja answer.
#5. I assume this new engine uses a magneto (and not electronic ignition)?
unknown
#6. What kind of results do you predict I would get if I use this new engine and 720mm blades with the stock (7.35) Spectra-G gear ratio?
Since AFAIK, there is only one of these engines in the world, you may have a hard time getting this answer. BTW, the stock gear ratio is 7.15:1.

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01-07-2009 12:43 AM  9 years agoPost 16
Justin Stuart (RIP)

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Plano, Texas

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Thanks. I can't wait to see what these other reviewers think of the engine when they finally get it in their hands.

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01-07-2009 01:53 AM  9 years agoPost 17
bosshoss

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Chicago, IL

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subscribed.

Why Hover a Yak, when a Heli does it better?

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01-07-2009 02:53 AM  9 years agoPost 18
Excalibur

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Destination: Earth

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#3. To get a 6.92 gear ratio, the Spectra-G will need both a new main gear and a new pinion gear, right? What will the numbers be for these new gears need to be? Do you think MA will have them available?
The lowest gear ratio I was able to get on the Spectra-G was a 6.69 by using an 87 tooth main with the stock 13 tooth pinion (Minair didn't have any other pinions available). As Carey said, you will need to slot out the two clutch block mounting frames with a dremel, but it's really not that hard. Use washers when securing them to the frames:

#4. Will changing the gear ratio like this necessitate new mounting hardware for the Jewel generator?
This is where things get tricky. When I changed out the main gear to the smaller 87-tooth, it also changed the mounting position of the Jewel generator. To get everything to fit, I had to modify the Jewel mount, sand down the back side of the anti-rotation bracket, and shorten the swashplate anti-rotation screw that fits into the bracket. I also slotted the frame holes on the anti-rotation bracket and moved it back about 1/8". One picture says it all:

You can see how the Jewel is moved back from it's normal position, and how close it is to the anti-rotation bracket, but it all works without any trouble. I didn't have to buy any new mounting brackets for the Jewel, but did have to modify them. I don't know if you'll have to go to these extremes for a 90-tooth main, but you will if you go with an 87-tooth.

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore

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01-07-2009 03:19 AM  9 years agoPost 19
rbort

rrProfessor

Franklin, MA - USA

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Thanks Excaliber for the answer!
Yes if you shift the gear ratio you will cause the AXI motor to move closer to the swash and then you'll need to do what excaliber did to regain the clearance between the jewel motor and the swash anti-rotation guide and screw.

You can change the GR to 7.08 from 7.15 by dropping in a 92 tooth main gear and won't have to move anything. I did that with mine and the Hanson motor is quite happy with my head speeds (1540 to 1780) with that GR.

Carey answered the rest of the questions, thanks!

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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