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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › OF 4 blade head trial on Raptor 90
09-07-2006 07:37 PM  14 years ago
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DenisS

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england

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OF 4 blade head trial on Raptor 90
I decided to try my OF head, which is 12 mm and right hand rotation ready for my Baumann Puma, on my old Raptor 60, but using an OS 90. Doubled up on the collective servos and it flies brilliantly. Wind was very gusty today, not ideal for a test flight but i was pleasantly surprised. Got it all on video just in case but there were no problems at all, apart from tracking. I will post pics and the video later but in the meantime I will be putting some hours in while I build the Puma.
Very happy
Denis
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09-07-2006 08:32 PM  14 years ago
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rrApprentice

Chandler, AZ

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I've been looking at putting the OF head on my TT MD500 but the $700 to try it is a little steep. What size blades are you runing. I can't wait to see pics. I would like to see some detailed shots of your setup.
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09-07-2006 08:37 PM  14 years ago
Copter Doctor

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Enterprise/ft.rucker ,al- home of army aviation

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i have tried the same combo and it does work very well. i too was very surprised at the handling even in windy conditionsdrive a rotary, fly a rotorcraft
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09-07-2006 11:15 PM  14 years ago
seattle_helo

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Seattle, WA USA

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Denis, sounds good. Was that your first experience with a multiblade setup?

nick
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09-08-2006 03:57 AM  14 years ago
Dr.Tim

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Mojave Desert

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Love the Puma and the OF Head ... Good Combo indeed!


Dr.Tim
From Simple minds come simple ideas! Approach Engineering
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09-08-2006 08:08 AM  14 years ago
Bignose

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England

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Never mind about the Puma, get the Long Ranger finished yer lazy tyke.....
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09-08-2006 08:14 AM  14 years ago
Bignose

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England

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Never mind about the Puma, get the Long Ranger finished yer lazy tyke.....
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09-08-2006 02:27 PM  14 years ago
heliraptor

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Colchester, Essex, UK

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Hi Denis

Sounds good, are you going to run the Raptor mechanics inside the Puma ???

If so how are you addressing the tail drive?

About time we went flying!

Cheers

Lee
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09-08-2006 03:31 PM  14 years ago
DenisS

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england

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Hi seatlle
not my first 4 blader by a long shot, have flown a few flybarless models over the years.
A&P
I'm running the 670 blades, which do get close to the tail blades as i haven't put the long boom on.
Hi Lee
I'm not putting the Raptor in the Puma, a Vario gasser is ready for that. I will be using the flexible tail drive as per LM fuses. Still haven't even looked at starting the LM Lynx yet, not enough time.
Bignose
stop going on about the Longranger or I'll tell everybody about your roll over weekend ha ha


I fitted the NHP rear servo mount kit and put the second collective servo where that used to be, then mixed Aux2 with pitch using the 'link' feature which means that both servos follow pitch curves and trims equally (very handy feature on the ZHP) then used the built in swash rotation mode to get the phasing right with a nicer pushrod angle (another nice feature on the ZHP) I will zip the video of it's very first take off in the windy conditions but it all went swimmingly.

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09-09-2006 06:05 AM  14 years ago
seattle_helo

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Seattle, WA USA

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Denis, compared to the other flybarless heads you've flown, what were some of your specific impressions of the OF system?
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09-09-2006 07:42 AM  14 years ago
DenisS

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england

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Hi seattle
First, remember that I am NOT using eCCPM so I won't be using a mixer of any sort. Secondly, I could put a gyro directly on the elevator buy I will avoid that. My impression is that it hovers very similar to a flybar model. I will be taking it into circuits and forward flight today but it seems very stable.I did small figure 8's and hovered cross wind and didn't have any trouser wetting moments so overall it's good. I experimented with hovering autos and it floats down from 6 to 8 feet ( in the wind) but obviously the Raptor is lighter than the Puma is going to be. I will check the rpm today too as although I'm running the OS 90 I kept the 60 gearing to keep the revs on the head down.
A&P
If you decide to go ahead I'm sure you will be happy. I assume you will go with the 5 blade head, if so just make sure you keep track of any numbering that the blades and head have- i.e. the position relative the the blade holders is important. My blades are balanced in pairs and numbered so that 1 and 3 are opposite, then two and four are opposite. There is two grams difference between 1&3 and 2&4 but there are no vibrations in flight. And besides all that, Al Wert is a great guy to deal with.
Denis
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09-09-2006 08:00 AM  14 years ago
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rrApprentice

Chandler, AZ

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Thanks DenisS, There is only one problem left that I can think of, is there a way or a mixer to phase the head of a non ccpm heli. I fly a JR 9X and 8103 and they don't have any head timing. I think the rods will be too short to do it mech. Could it be done using 2 free mixers in the radio.
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09-09-2006 08:49 AM  14 years ago
DenisS

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england

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A&P
I have a JR 9XII so I will have a look through that. I would imagine it's possible. You may not need a second servo on collective either, just a good powerful one. I used small servo wheels to keep the loading low on the outputs, and remember that you don't need anywhere near the movement that you would with a flybar system as it is direct blade control.
Right I've just looked through and what you can do is use Mix 1 for elevator to aileron, Mix two for aileron to elevator, these are curve type mixes so you can play wth the point values to get the phasing right. I will take a picture of mine to show the postion that it's in when I give elevator with a blade over the boom. Then use Mix 6 to get the two pitch servos to work together. This is a more basic mixer and if you mix it to Aux 2 you will have to make sure that the three postion switch is in the center or you will fry the servos. I think you can disable the switch. Again I will check that out. It will take a bit of experimantation but the radio is capable of it, I'm sure.
Denis
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09-09-2006 08:52 AM  14 years ago
DenisS

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england

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Again I've just checked and if you go into device select, under the aux 2 switch you can inhibit the output and the mix will still work. You can get your heli set up fairly quickly. If you want me to give it a try for you with the JR receiver in my Raptor I can do, then I can give you all the settings.
Cheers
Denis
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09-09-2006 08:59 AM  14 years ago
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rrApprentice

Chandler, AZ

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Thats allright. I think it'll work. Do you think the OS 61WC with the stock raptor 60 gearing would have enough power to swing the head with 655 or 670 blades?
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09-09-2006 09:07 AM  14 years ago
DenisS

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england

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I suggest you try to get a pinion one tooth smaller. Use the 655 blades ( are you going with the 5-blade head?) There is a lot of torque with the 5 blade head. You MUST keep the headspeed below 1250 which may be difficult with the standard gearing. I bought a 9 tooth pinion or a Raptor 50 hoping it would fit but it doesn't. I think with the 90 though it is more than powerful enough. My very honest opinion is that unless you are going for scale competition then you may find it a waste of time fitting the head, and the MD500 is not really a competition model. You will enjoy flying it more with the standard head, but that is my opinion and it could be that you want to experiment with a multiblade anyway.
Good luck

Denis
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09-09-2006 09:18 AM  14 years ago
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rrApprentice

Chandler, AZ

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Very good points. I am thinking of the 5 blade head but you are right, I do tend to fly it like I stole it! I've had a Vario 2 bolt 4 blade on a benzine trainer, only hovered it a few times (I was still learning to fly at the time). I now have a BK-117 with a 4 blade head that I bought from R22pilot. Hovering it now I can tell I've learned allot in the last 6 years.
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09-09-2006 01:55 PM  14 years ago
sjferrozzo

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minnesota

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A/P
have you flowen in forward flight yet i have the same setup and it flys great just very scary when i am trying to slow down
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09-09-2006 10:50 PM  14 years ago
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rrApprentice

Chandler, AZ

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What does it do?
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09-10-2006 02:29 AM  14 years ago
sjferrozzo

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minnesota

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as i fly
it to my left and turn the tail to the left so the nose come around it flys by me and then when i start to slow it down it ballons up and when i bring it to a hover 30 to forty feet up the heli starts to ossalate before and drops about 10 feet before i can bring it under control but very scary i have the gyros on the head but i do not have them turned on when i fly it full speed she flys by me fine i have to keep it in forward flight at full speed and then it will act fine its just when i try and stop

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HomeScale✈️AircraftScale HeliScale Helicopter Main Discussion › OF 4 blade head trial on Raptor 90
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