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Boca Bearings . Modefo's RC Helicopters . XHELI.COM

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Gasser Model RC Helicopters > My Spectra arrived - Cracked canopy and all!
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Like I said, I wouldn't dump a Pred for a Spectra, but it is a better design, IMHO. I decided to sell my Pred because I don't see it getting much flight time with the Spectra around.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
06-30-2008 04:51 AM
 
 
Toadster25
Veteran
Location: Iowa

I will be interested in hearing about how much difference TRM engine makes. I have a pre Al, hanson modified G26 that has too much vibration for the Spectra that I would like to send back to Al and try someday but then I want a generator too so maybe I better just fly it like it is. Once you start you just can't stop and it already flies just fine.
06-30-2008 05:03 AM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Thanks for the awesome flight review/comparison!

I enjoyed reading every word of your post!

As you say, its not lacking for power at all with a 231, and that's a stock one. Wait until you try a more powerful modified motor, it will tractor pull faster and be harder to bog giving you more freedom with the collective.

Really what I love about gassers is their absolute convenience factor. You get home, the weather looks nice. You weren't thinking to go fly, but now you're feeling the urge. You run down to the basement, grab the heli and TX, pass by the garage to grab the gas can and you're on your way. Upon arrival to the field, you can be literally in the air within 2 minutes. With a Jewel on board as long as the TX is not beeping low battery you're flying -- How can you beat that?! All that and for a bonus there is no field equipment, no glow plugs, no expensive nitro fuel, and no cleanup efforts afterwards. So what you leave the quick stops of the nitro birds behind, its a win win situation all around sans that!

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-30-2008 05:09 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

90% of the people who looked at the Spectra yesterday asked about the generator on it. After the first few, I started telling people it was a hybrid, that the electric motor flew the heli and the gas one charged the battery. I think I would have gotten a few to believe me if they didn't know that I like to mess with them.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
06-30-2008 01:39 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

The AXI motor

Everyone always asks me if its a starter...I tell them its my power plant that runs the whole heli!

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-30-2008 04:07 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Hybrids are in style.

BTW, I found that Grainger carries those counters, $13, I'm going to pick it up in an hour or so.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
06-30-2008 04:25 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Post a picture

Of the Grainger counter when you get it. Will be curious to see how it looks.

Edit: Oh wait...is it this one:

http://www.grainger.com/Grainger/items/6X164

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-30-2008 07:51 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Yup. Question, I know that Minair uses the side plates to set the mesh for different gear ratios. The generator came with plates that replaced the 7.15, if I change ratios, do I need different plates?


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
06-30-2008 09:19 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Put flight 5 on it today, would have done more, but I lost a thumbscrew on the canopy. I really beat on it today, it'll do continuous tic tocs just fine, although they take collective management, backwards inverted is nice, big autos, lots of flips and things. Great heli, but I want my TRM 231 to come back, now I'm really curious what the power difference is.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
07-01-2008 01:25 AM
 
 
Eleven_Bravo
Senior Heliman
Location: Modesto,CA

 YEAHHHHHH Continuous tic-tocs. Even though I have all of these people telling me all a gasser is good for is to just fly around. That just makes it harder for me to wait

I am sure they are slower than nitro tic-tocs??? Do you think a four point tic-toc is possible??? All with the stock 231 ain't it great

What head speed are you running??

Its not a maneuver until your looking down on it. ~Jason Krause~ Phoenix FF 08
07-01-2008 03:28 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Oh yeah, no where near the speed of a nitro, and it took me a few before I got the collective timing down (I had just flown my flybarless 600n with the TT53 in it, that has STUPID power). But it does it just fine, and by opening them up a bit I could climb doing it. I'm sure a 4 point is possible, my thumbs aren't up to it, but I'm sure it'll do it, I did side to side and tail down without any real problem, although my sideways ones are messy, but that's me, not the heli. You can't fly it just like a nitro, you have to plan for direction changes and collective timing, but the Spectra is a lot closer in feel to a nitro heli than any other gasser I've flown.

I haven't tached it, but it should be in the 1850 range, and I'm pulling 11deg positive and negative. It sounds about there, and according to my calculator for the RevMax, it should be holding it there. I'll tell you, it sucks down fuel beating on it like that, I've got a 14oz tank and have the timer set for 12 minutes, and after flying it like I stole it then doing a few autos, I'd bet I had less than 2oz left in the bottom of the tank. I'm changing to a 16oz tank to give myself some headroom.

This was also the first flight since changing my throttle servo. I was running a JR DS8301 (.21 sec) on throttle, and it wasn't able to keep up with the 8717s on cyclic. Swapped it today to a Hitec HS 6965HB (.10 sec), and the headspeed stays much more consistent.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
07-01-2008 03:44 AM
 
 
patriot21
Key Veteran
Location: Eagle Lake,MN

Nick... you need to post a youtube video of this machine!!!!

My Sponsor:VISA
07-01-2008 04:22 AM
 
 
Eleven_Bravo
Senior Heliman
Location: Modesto,CA

11 positive and negative huh on a stock 231 what is the max range with the Spectra or did you just settle with 11 because thats what it will pull ??

Yes please post a video?? You tube any tube I don't care but please post a vid

I was planning on running 4 8717's how much cheaper is the 6965HB compared to the 8717. There was a guy on here that had a hitec servo go bad on his throttle I would double check hitecs web site and make sure that servo is suitable for your application. I would hate to see your new Spectra lose its throttle servo and go full throttle and burn itself up or something.

Its not a maneuver until your looking down on it. ~Jason Krause~ Phoenix FF 08
07-01-2008 04:33 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

11 is just what I set it up with while building and it works, 10 would be a better number since I can bog it pretty easily when I get sloppy, but I figure it's making me a better pilot with it at 11. Dunno what the max is, but I'm not at it, I've got the Tempest head and just guessing by looking at how much more the washout block could move I'd say it'll do something in the 15 deg neighborhood.

A video of me flying isn't that exciting, go Dl the video of Raja flying his, it's got way more power than mine, his headspeed never wavers. It certainly shows the grunt of the Hanson 26, and he's a better pilot than me. Go check the Qww forum, there's a video of me breaking their 600mm electric, if you want to see more of that dull stuff, I'll see what I can do.

I used that servo because I had it. It's got about 6 hours in the air on the tail of my Pred gasser and has been great, so I'm sure it'll be fine on my throttle. It's not a low end Hitec, it's about as good a servo as money can buy. I'd use an 8717 or 8900, but I'd have to buy those, this one was paid for a long time ago.

Btw, 1 hour of flight time now and I still haven't touched the battery. Damn is that cool.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
07-01-2008 04:55 AM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Sounds like you're having alot of fun!

I'd say go with the 16oz like you say, that is what I use and if I beat on mine hard I could end up with about 2oz left but I'm not turning up rotors as fast as you. This way you'll be able to get closer to 15 minute flights so 4 will be an hours worth of airtime.

The generator frames are not slotted to allow for GR change. In reality I think the stock frames aren't either. You'll have to slot things to get stuff to move around and readjust the cap. But as it is the AXI motor is close enough to the swash antirotation link screw I personally wouldn't want to get any closer. If you want to change GR but not fiddle with spacing or slotting the mount, you can go to a 92 tooth main (I did this on mine) as its the same size as the 93 tooth and a direct fit with no moving of anything to get the right mesh. This way you can go from 7.15gr to 7.08gr with very little effort. The Spectra was optimized for a G231 running 1800 head speed from what I understand, so for me with a G26 I decided to slow the motor down just a bit with the easy GR change.

Only 1 hr worth of flying so far? I thought you were up to 45 minutes the other day. You just flew only 15 minutes today?

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
07-01-2008 05:30 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Yes, only 1 flight today, the 5th on the heli. Lost a canopy thumbscrew, so I packed up and went home after only 1.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
07-01-2008 05:52 AM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Locktite

Your stock motor could be shaking a little more than necessary. In the meantime try a little locktite on the screws it will definately help to keep them on.

So you're up to 4 flights now if your counting them as 15 minutes each. I'd be interested to know if you can indeed fly 15 minutes with the 16oz tank at the higher head speeds.

Tip: If you are using the stock aircleaner box, get a plastic washer and install it under the screw where the choke pivots on. If you don't over time the choke will become looser and will close in flight making the motor lose power and force a landing.

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
07-01-2008 02:41 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

I'll keep the timer at 12 until next week. I decided to go with a Raptor 90 3d canopy for the heli, it's a bit wider and easier to see nose in for me than the stock one. That should come from Canopy FX some time next week and I'll swap the fuel tank then.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
07-01-2008 04:54 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Selling the Predator

Man you were serious! I just came across your post in the classifieds with the Predator and all the spare parts you had for it. Looks like she's gone already, wow that was quick!

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
07-01-2008 08:44 PM
 
 
Carey Shurley
Senior Heliman
Location: Orlando, FL

The primary purpose of the spectra was to move gas helicopters more into the 3D flying arena. To get this required head speeds in the 1800ish range with 700-710mm blades.

Originally the model was intended to only be used with the G231 motor and a lot of the testing was done with a 7.25 gear ratio which lets a stock motor turn up high enough to work pretty well for 3D but produced more vibration than was desireable. This ratio was reduced a little to 7.15 to take the edge off.

Later, TRM began custom porting motors specifically for the gear ratio and application.

A stock G260 is not at all happy with this ratio, and vibrates badly. The "tuned" motors seem to help with this but they still pound the airframe pretty good. Raja's had pretty good luck by lowering the ratio a bit more.

May be some more options in the future we'll see.
07-01-2008 09:40 PM
 
 
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Gasser Model RC Helicopters > My Spectra arrived - Cracked canopy and all!
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