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rbort

rrProfessor

Franklin, MA - USA

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Well, it all started in 1997 when I had been flying a 30 size nitro for 7 years and decided I wanted something bigger.

Miniature Aircraft was popular with the Xcell line and I wasn't too keen on burning so much more nitro with a 60 size machine so I opted for the 1005 gasser.

I picked her up from a hobby shop in Beverly MA (had to drive an hour to get there) and I was excited to start. That kit came with the engine so all you needed was your radio gear.

There were no forums back then, and nobody flying gassers. So I was on my own, figure it out Raja! I stuck with it and I clearly remember it took me 76 flights before I got things under control and I was no longer pounding my heart in my chest when flying it. Here she is today, my oldest teenager going to be 20 next September!!

So as I got more comfortable, I started going to funflys locally. I flew this machine solely with no other, as I sold my Concept 30 back in 1997 to help fund the cost of this machine, which, by the way, I figured would pay for itself in nitro fuel cost savings, and boy was I right about that!

Runryder came around in 2002, and by 2004 it had been 7 years and 7 months and I was up to 1200 flights on this machine. You can read about it here, that post still exists here, really! I started going to further and further away funflys, and my buddies started telling me I need a 2nd machine (and they were right). I mean drive 440 miles to go to MHA for those who remember it in Maryland and something goes wrong with your machine then you're grounded, not good!

So the Spectra-g came out in 2004 and MA advertised it as the Fury Gasser at first, designed to be a 3D machine. Some people got it but they were having trouble setting up a gasser and getting it to 3D and/or fly properly, but I was determined that I would succeed with it and back in September 2005 enter my 2nd companion to the 1005 to go to funflys, my Spectra-g. By 2004 I had installed a generator system on the 1005, and the Spectra flew only 1 test flight (because I was so excited and couldn't wait) without the generator and got it installed on flight #2. Here she is today now 11 years old:

So those pair served me well, and I attended more and more funflys with them. If I botched an auto and busted one, then I had to be super careful with the other one to get through the weekend. I recall that happening at least a couple of times, and in both cases either the Spectra or the 1005 pulled me through the rest of the weekend.

As the years past, MA created the Whiplash machine, simplifying the model even more, making servos direct to swash and alot less parts. It also sported the RC engine which is smoother than PUH engines in general though with my track record, I had proven that you could fly PUH engines for thousands of flights between the Spectra and the 1005.

Anyway I had to have the Whiplash to round out the group, and make it three's company. This way I had 1 extra spare heli, and going to events if something went wrong with one of them, I still had a pair to fly and wasn't on my "last straw" so to speak. Acquired September 2012, here it is today just over 4 years old:

The Whiplash flew the best of all three, with the 1005 being originally mechanical mix (since then I've personally modified it to ccpm), the Spectra being ccpm but with bellcranks, and the Whiplash being direct to swash felt the most locked in. These differences are subtle, but you can feel something between one machine and the next.

Happy with 3 and going everywhere with my Cmax plug in hybrid car, they sat on the top deck above the HV battery perfectly and travelled in style with me. One day I went to a funfly in Alabama, and this very nice guy there had a crashed Raptor 90 conversion to gas that he didn't want, and just decided to give it to me. I still say thank you! I brought it home and it sat crashed in the basement for several months, and then the 1005 had an airframe metal fatigue failure in flight (due to my lack of crashing to replace parts) and it broke in 2 pieces in the air and went in.

The 1005 looked harder to fix than the crashed Raptor, so I decided to move all my electronics from the 1005 into the Raptor, buy a Hanson 300 RC motor for it as well as a muffler, and about $100 worth of parts and I had the thing all together ready to maiden. It needed other parts as well, buy the fellow from Alabama gave me some spares as well which I was able to use to complete the repairs.

Now all of a sudden I had 4 gassers, and it went from three's company to 4 is a crowd! Now if I wanted to take all 4 helis with me on trips, I had to lay one down on top of the back seats, and my luggage had to go in the front passenger seat which used to be empty for guests.

The Raptor is a mechanical mix machine, but I made it flybarless and with the Bavarian Demon in it the thing flies on par with the 1005. I had to put the generator on the tail shaft in the gear box up front that drives the tail as there was no room for it to go on the start shaft with the aileron servo pushrods on both sides and the servo tray that moved up and down with the motion of the collective servo. It became a backup extra machine that I could fly as MA at the time was in the process of being sold and not making any more products. Here is the Raptor as it sits today, now about 15 months in service:

Miniature Aircraft got sold to a wonderful couple from Germany, Josef and Judith, and they bought the company for the love of the MA models, they didn't want to see them die off. The best part is that they are doing it with their passion for the helicopters, so they are not cutting corners to make money so to speak, and things are turning out even better than they used to be. They have been to a couple of events, most recently IRCHA 2016, and have listened to people's gripes with the Whiplash V1 drive train and are proceeding to manufacture the V2 model with all the improvements. Please see the separate post about this in the gasser helicopters section.

Tonight I just finished mine, one of the first V2 models to get out from their factory, and soon many more to follow. She just got added to my 4 is a crowd gang, and now its become the "Fleet!" Here they all are as they sit tonight in my workshop:

For the record, here are the Maiden days:

MA 1005, 9/22/1997, 4038 flights to date.
Spectra-g, 9/21/2005, 3104 flights
Whiplash V1, 9/20/2012, 1264 flights
Raptor 90 Helibug-g conversion, 8/21/2015, 267 flights
Whiplash V2, 11/21/2016??, 0 flights

** Note that each flight is practically an entire tank, so about 18 minutes on average.

Hope you enjoyed this historical thread of my involvement with gassers.

Best regards and keep those rotors turning, 100,000 times an outing at least! I usually range between 100k and a quarter millon revs.

-=>Raja.

MA 1005 H280, 4066 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3145 flts
Whiplash V1 27 3DMax, 1335 flts
Whiplash V2 H300, 51 flts

11-21-2016 06:29 AM
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whiskey29

Heliman

Samarinda

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Awesome !!!!
Seeing your flight numbers, I need to fly more

How light is Whiplash V2 without the generator and battery ?

11-21-2016 01:28 PM
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rbort

rrProfessor

Franklin, MA - USA

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Weight

I just checked it, looks like 13.22 to 13.27 lbs. Scale varies between those numbers with several tries.

I checked the original whiplash and its 13.09 lbs.

The original whiplash used to be 12 lbs 10oz with the century V2 muffler. I replaced those since with the Zimmerman as they are quieter but make more power. They also weigh about 4 to 5oz more. With the century V2 if you don't mind the added noise you would drop below 13 lbs.

The original whiplash also gained some weight with the new upgrade parts. The main gear is beefier, the torque tube is stronger, plug the metal vs the plastic gears. I can't remember what else I changed but over time it porked out a little bit more.

The new whiplash as a totally different center section for the main gear/transmission, one way bearing. The bell is now steel and actually rings like a bell when you tap on it..! Plus the extra support, bearings, etc makes a little bit more difference.

Remember that both these machines also have my generator on board, the mount for it, coupler, front and rear LEDs, voltmagic battery monitor, and tank light. Without all of that you could probably lose 1/2 a pound if you wanted to, but the Jewel generator is worth its weight in gold to me -- won't even fly without it any more.

-=>Raja.

MA 1005 H280, 4066 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3145 flts
Whiplash V1 27 3DMax, 1335 flts
Whiplash V2 H300, 51 flts

11-21-2016 06:33 PM
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whiskey29

Heliman

Samarinda

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Thanks for the explanation Raja, I have been eyeing on whiplash v2, goblin gasser, and some conversion for my third helicopter and I you made me lean to whiplash side now

By the way, does the generator works with 2S lipo battery?

11-22-2016 01:06 AM
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rbort

rrProfessor

Franklin, MA - USA

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Sure

4 options with the generator system:

5.5v works with 4 cell NiCD or NiMH packs
6.9v works with 5 cell NiCD or NiMH packs or 2s LiFE packs (what I use)
8.5v works with 2 cell Lipo or Li-ion packs

and for aerial photography/video downlink stuff

12.5v works with 3 cell Lipo or Li-ion packs.

I have Whiplash generator mounts in stock, Carey has Goblin generator mounts in stock.

-=>Raja.

MA 1005 H280, 4066 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3145 flts
Whiplash V1 27 3DMax, 1335 flts
Whiplash V2 H300, 51 flts

11-22-2016 02:31 AM
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whiskey29

Heliman

Samarinda

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So just plug the generator output from the regulator parallel to the lipo? Does the lipo needs to be balanced once in a while ?

I used Life before, but recently changed to futaba bls hv servo.

11-22-2016 03:03 PM
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rbort

rrProfessor

Franklin, MA - USA

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Servos

I use Futaba BLS servos in mine, HV as well but they run no problem on 6.9v.

Anyway in regards to your question, the lipo goes to the switch, and the switch goes to the receiver. The generator goes directly to the receiver on one lead, and to the flybarless unit on the other lead.

Your lipo won't go out of balance because the current draw on it is very little. In fact you can check it 6 months later and you will find that the cells are still well balanced.

-=>Raja.

MA 1005 H280, 4066 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3145 flts
Whiplash V1 27 3DMax, 1335 flts
Whiplash V2 H300, 51 flts

11-22-2016 03:05 PM
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whiskey29

Heliman

Samarinda

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I see, thanks for the explanation.

11-23-2016 01:27 AM
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jharkin

Senior Heliman

Holliston, MA - USA

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Whiskey-

+1 to Raja's comment about balance. In the early days of electric fling manufacturers never even put balance taps on 2S packs.... its just not an issue with 2S at the slow discharge rates used in RX applications.

One thing you can do if you are worried about the LiPo lifespan is to set the generator voltage a little lower - say 7.9 or 8v. This way you wont be storing it at full charge all the time and it will last a lot longer.

You could even just run it at storage (7.7v) all the time and really extend the life. All you give up is a little bit of servo power.

(Note that LiFe dont have these restrictions and can be stored full all the time with no degradation.)

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

11-23-2016 12:22 PM
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jharkin

Senior Heliman

Holliston, MA - USA

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BTW, what Raja leaves out of his story is the fact that he has been a great friend, teacher and mentor to many other gasser pilots through all those years.. I am an old time "planker" pilot that just happens to be in the same club as Raja and for years and years he tried to talk me into trying a heli..

Well, about 4 years ago I finally gave in, and after 6 months of practice on a little flybar TRex 450 Raja talked me into a Whip-G. I was hooked from there and now Ive got two gassers with about 250 flights between them and am working on my inverted and flipping auto's thanks to Raja's tutelage

Thank you sir.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

11-23-2016 12:27 PM
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whiskey29

Heliman

Samarinda

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Thanks jharkin.

I am pretty much lonely here, Heli flyer population in my town is not great, I can name them all I guess, and my fingers are enough to count them.

There is only one guy besides me that own a RJX gasser, he only hover, crashed all his electrics, and asked me to setup the gasser, however I couldn't get the engine to fire up.

Besides him, I am the only guy who own and fly gasser.

I really wish to have flying buddies or someone whom more experienced. The guy who got me into helicopter lives 1000km away, he thought me everything I need to know to setup and fly helicopter a few years ago.

Its quiet challenging and difficult to learn mostly online. I got the heli setup part ok, setting the needles are still difficult for me, setting the carb for boat is easier.

Right now I can hover upright all orientation. I can do FF just fine, I need to work on my inverted hover. I also need to work on my backward flying, inverted FF and backward. Then sideways ... so many to learn.

Btw, if the regulator is set to 8.4, wont the servo also receive 8.4v ?

11-23-2016 02:02 PM
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jharkin

Senior Heliman

Holliston, MA - USA

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Btw, if the regulator is set to 8.4, wont the servo also receive 8.4v ?
Correct. Raja's design basically works identical to the charging system in your car. The entire electrical system + the battery just floats at whatever voltage to regulator output is set to.

For this reason its important to select a voltage that is well matched to both the battery you want to use and the electronics you run. All the lithium chemistries (LiPo and LiFe) and lead acid are CC/CV charging so if you set this voltage somewhere between their nominal and full charge voltage they will just absorb as much amperage as the generator will put out until they get full and then the current will taper off to zero.

As long as the average draw of the servos is below the generator's max output the system runs perfectly. The occasional high amp spike is no problem and will just draw extra current from the battery which is acting as a buffer (and then recharges). Only If you have some continuous high draw loads on the heli that pull more constant amps than the generator can supply the battery can in theory run down. One guy on HF had this problem but its never happened to me.. On my whiplash I use the same servos as Raja and I run an 1100 LiFe pack, I checked it after 2 years and it only took ~ 100mAh which is just about right for being 90% charged at 6.9v.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

11-23-2016 02:38 PM
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whiskey29

Heliman

Samarinda

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May be running LIFE with my HV BLS will be healtier for the servos. at 6.9 its just a tad below the requirement rather than running 8.4.

11-24-2016 12:57 AM
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jackp332

Key Veteran

Claremont, Nh USA

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Nice write-up Raja, I enjoyed the read

12-03-2016 11:53 AM
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