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Scorpion Power Scorpion Power
08-12-2007 07:07 AM  10 years agoPost 221
Burnt Offering

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Winter Wonder Land,​Wasilla Alaska

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Well Fix, what happened with me was this. I had an OS .91 SZ hyper pumped in my bird. And before I cooked that I had everything balanced perfectly. I mean it was smooth as silk. So it worked out really cool cuz it was all still balanced after I put my g26 in it. I mean it was a thing of beauty to watch it. All the fear of vibration was put to rest the first time I started it. But since I wrecked I'll have to start all over again getting the blades and everything else balanced. I'm not sure what to expect. I'm running red dampers right now.
But back to the gear thing. I'm only guessing here and correct me if I'm wrong. As I've said before, I'm not a machinist. The reason we want to change gears is because the current ones will not let the engine turn at a high enough RPM? SO by putting lower gears in, it will increase the RPM of the engine therefore increasing the head speed correct? And if I'm understanding correctly, TT does not make the proper gears for the Raptor?
Keep me posted on your flights. I want to know before hand if there is anything I need to watch for.

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08-12-2007 05:04 PM  10 years agoPost 222
AceBird

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Utica, NY USA

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The reason we want to change gears is because the current ones will not let the engine turn at a high enough RPM? SO by putting lower gears in, it will increase the RPM of the engine therefore increasing the head speed correct?
Nope you are a little twisted here. It is an inverse function. If the gearing increases the engine RPM that decreases the head speed and of course vice versa.

Ace
What could be more fun?

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08-12-2007 05:29 PM  10 years agoPost 223
Burnt Offering

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OK Ace, Its obvious you have some knowledge in this area. School me dude. I am pretty sure I don't have many options here. When I flew my Rappy with my G26 and stock gears, It flew fine. I'm sure that I didn't have the head speed that everyone seems to be looking for BUT It still flew like a home sick angel.Is changing the gears really Neccesary? If so, what ones made by TT can I use, as I'm not going to spend tons of money to have one machined. If you've folowed this thread you know that I what I would REALLY like to do is stretch my ship and run some 800 high lift blades. If all is well I will be putting a Airfoil Pro 1 mount and a SLR camera on board. WHat do you reccomend. IF all this is just to much to ask for well, then I'll just buy a JR. Gasser. WOuld like to make it work with my Raptor just because of the cheap parts and the sheer number of parts that I already have on hand.

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08-12-2007 08:50 PM  10 years agoPost 224
AceBird

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Utica, NY USA

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What do you reccomend.
I’ll tell you right off the bat, I don’t have any experience with a Rappy. But looking over the mods done here I can see this was a glow powered heli and it makes it tough to just throw a gasser in place of a glow engine. But wait, hold on, because you are progressing in the right direction. Putting on longer blades means you will need that higher gear ratio that is common for a glow powered heli. So you may well fall into the outhouse and come up covered in gold, as they say. Of course people are doing whatever they like but I feel a 260 should not go over 10 grand and maybe stretch it to 11 grand for the 231. Like I say others don’t stick to these numbers at all.

I myself just got a pair of 800’s that I slapped on one of my standard Predators. I know its not cool to do this without stretching the boom but I did it anyway to see the reaction of the longer blades. After talking with Paul (FCM) who has the mains stretching over the tail, I know how much I need to stretch the mast to do this safely. So that will be one of my winter projects.

Of course I have some off the wall ideas on how an AP craft should really be constructed but it is too early in the thinking stage to reveal them now.

I hope I helped and not hindered and good luck on your endeavor.

Ace
What could be more fun?

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08-12-2007 09:14 PM  10 years agoPost 225
Burnt Offering

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OK Ace, here what I have planned. I'm going to take all winter to do this too so there is no hurry. Winter starts here around the first of October and last for 8 months so I will have nothing but time on my hands to get this right.
What I HAD was this. I was running TT 710 CF's with a OS .91 SZ hyper pumped. What I have now is all that but with the G26 stuck in there. The plan is to do the broom handle stretch mod that I've seen many guys have great success with on this forum, and put 800 high lift blades on it. I would REALLY like to make this work as I said earlier because the Raptor is a reliable AFFORDABLE platform, and parts are dirt cheap and I have buttloads of them already. I don't want to start a JR parts inventory if I can keep from it even though I know that their gasser is a killer machine. If I can do this with mostly Raptor parts I will. If I have to do hundreds of dollars worth of mods to the gearing right I will bite the bullet and buy a JR Gasser and just use My Raptor as a snapshot ship. I figure no matter what gears I have in it it will at least lift a Point and Shoot camera. So anyway, theres the plan.

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08-12-2007 10:53 PM  10 years agoPost 226
AceBird

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Utica, NY USA

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and put 800 high lift blades on it.
Oh I forgot to mention, I wouldn’t use “high lift” blades on an RC designed heli if “high lift” implies non symmetrical blades. Now here again other people might do it but I wouldn’t. A non symmetrical blade will change the point where the lift occurs on the blade as the AOA is changed. This causes a moment on the blade grips that will have to be overcome by your servos and if nothing else could overstress something in the head. Adding longer blades and putting an unknown stress on the head is not something I would entertain. I will let others experiment at their cost.

I thought about the broom handle extension but soon gave it up because most AP applications don’t require fast forward flight. Raising the head up to gain clearance with the tail blades not only keeps the boom parts from being special it lowers the CG of the heli which is another improvement for AP applications. That’s a win, win in my book. Making an extension for the main shaft is a no brainer and then all I have to do is lengthen the links by the amount that I stretch the shaft. Is your mast 10mm? Maybe the extension I make for mine would work for you too.

Ace
What could be more fun?

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08-12-2007 11:13 PM  10 years agoPost 227
Burnt Offering

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Alright Ace, I follow ya but wouldn't the downward wash from the main blades affect the tail rotor response? I mean would it be a good idea to have the mains blades rotor wash hitting the tail rotor?

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08-13-2007 12:01 AM  10 years agoPost 228
AceBird

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I mean would it be a good idea to have the mains blades rotor wash hitting the tail rotor?
Oh it sure is. That's another win because it increases the efficiency of the tail blades. I forgot about that, so now it’s a win, win, win.

Ace
What could be more fun?

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08-13-2007 12:10 AM  10 years agoPost 229
Fixit

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Ace
I would like to see how you extend or stretch the main shaft, do you have any photos?

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08-13-2007 12:23 AM  10 years agoPost 230
AceBird

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Utica, NY USA

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I haven't done it yet. But it is a simple shaft extension. You make one end female like the head is and the other end male like the shaft that goes into the head. You can make it a permanent extension or make it an adaptor so you can take it off and go back to normal. I am not going to do this until the winter.

Ace
What could be more fun?

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08-13-2007 06:54 PM  10 years agoPost 231
Burnt Offering

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Well yeah Ace, everything is simple if you have the skills and equipment to do it! Well, like I say, this need to be simple and cost effective. I'm not going to spend hundreds to do this when I know that Airfoil has already done the R&D and has a reliable platform with the correct gearing not to mention everything else. I would rather spend 2k and be done than to spend 2k and have something I can't use effectivley when I get done.

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09-01-2007 09:48 AM  10 years agoPost 232
Fixit

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My Raptor Gasser is still going strong after 15 tanks and not one problem on the conversion side, any one completed there conversion yet?

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09-02-2007 06:04 PM  10 years agoPost 233
golfietis

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Kaunas, Lithuania

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I`m starting flying with mine.

Mine is ready to fly. Yesterday burned one tank, engine runs good. Changed gearing to 91/12, and is feels, like it helped to get better running machine...

Now I need to wait for better weather...

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09-02-2007 07:09 PM  10 years agoPost 234
Fixit

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golfietis
I’m running with 91main and 12 pinion (7.58:1), I did mention this to you I think earlier in this thread anyway so far I’ve had no problems at all and would be out flying it now if it wasn’t raining, good luck and keep us posted on your progress.

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10-17-2007 02:13 AM  10 years agoPost 235
Fixit

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golfietis
How you geting on with your Gasser?

I've completed 14hrs flying with my Raptor Gasser to date and still no problems have arisen, no glitching, overheating or clutch problems, just one bolt on the tail linkage worked lose so far and that was down to me not using thread lock.

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10-17-2007 02:28 AM  10 years agoPost 236
Burnt Offering

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Winter Wonder Land,​Wasilla Alaska

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Hey Peter,
Got all the stuff I need to start mine today. In fact, I just changed out my pinion gear. Going to take my time and try to do a really good job. I'll keep you poseted.

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10-17-2007 02:44 AM  10 years agoPost 237
Fixit

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Hi Kevo
Good man, I'm just playing around with ideas for the Raptor Gasser Mk2 but there top secret right now

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10-17-2007 03:04 AM  10 years agoPost 238
Burnt Offering

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Winter Wonder Land,​Wasilla Alaska

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Yeah Peter, I think I'll clutter up this thread instead of Zaptors with my build.

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10-17-2007 06:05 AM  10 years agoPost 239
golfietis

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Kaunas, Lithuania

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Fixit

I`m not flying mine very much - it`s getting dark early now, and I have time to fly mine only on weekends, if weather allows. Another reasons - I`m getting 180C temp readings. Either my temp probe is fitted wrongly (on the tappered hole near plug), o tuning is wrong. I`m running on 1 1/2H and 1 1/4L now. And another thing - I`m getting tail kicks

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10-17-2007 09:42 AM  10 years agoPost 240
Fixit

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golfietis
I’m no expert but if your running in a new engine you will get the tail kicking but from what I’ve been told you need to richen up on the low if it kicks, I don’t use a temp gauge because it was said by a gasser pro on this forum that you will get to many false readings, I feel the crank case on the air filter side with my finger. What oil mixture are you using? I know I have a safe mixture (33:1) and my needles arnt too lean so I just run it and don’t worry about the temp and after a full tank check the plug, your looking for a light brown.

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