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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Radikal Gear Ratio and Batteries
06-02-2010 08:48 PM  7 years agoPost 1
teekay18

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Northwestern Ontario, Canada

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I'm getting close to having my Radikal air worthy and now have a couple questions about my setup. Here's my specs:

Radikal HD Carbon
Stock g20ei engine
Torpedo slim V1
Futaba R6008HS receiver
JR 8717's on cyclic
Spartan DS760 gyro
JR 8900g on tail
Futaba 9252 on throttle
GV-1 governor with stator gator
CNC carb block w/ thick gaskets from wally
Century air filter
Pull Start
Stock plastic tail blades
Century Sport Aerotech 640mm woodies
Gear Ratio ??
Batteries ??

I've pretty much read through all of the different radikal threads at some point or time but couldn't come up with what I was looking for, well I did somewhat, but I wanted to get people's opinion on my setup. I was wondering what the best Gear Ratio would be for my setup, HD head swinging 640mm blades with stock engine ? My other question is what type of batteries should I use for receiver and ignition ? I was planning on using either 4.8V NiCd or 4.8V NiMH to keep it simple without having to worry about regulators. So my question is NiCd vs NiMH ? From what I understand NiCd can be fast charged with little to no damage but have smaller capacities, and NiMH should be charged slower but have higher capacities; correct me if I'm wrong. I was also going to go with Sub-C type cells, does this sound right. So if you guys/gals could recommend which gear ratio and what type of batteries would best suit my setup, that would be greatly appreciated.

PS - This is my very first ever rc helicopter!! I've been waiting 13 years for this day, so I'm getting pretty excited. So if flying style has anything to do with my decisions, I want the radikal to handle whatever I throw at it

Tyler

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06-02-2010 11:37 PM  7 years agoPost 2
James Kovach

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canton, oh - US

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The HD's originally came with a 16T pinion and 84 main gear. This would give you a 5.25:1 gear ratio. They did change this to a 14T pinion at some point to give you a 6.0:1. So depending on what "run" of kits your is from will determine which you have. You will need to count the teeth on the pinion to know for sure.

I am not sure if they did also start putting 90T main gears in the HDs like they did with the LTs. Easiest way to know if you have a 90T main gear is the main and tail gears are darn near the same diameter. The 84T main gear is noticeably smaller. Again, counting the teeth will tell you for sure.

The Stock engine runs best when it is around 12,000-12,500 rpm. So you are going to need to pick your gear ratio to get the engine revving at that rpm.

With wood blades you are going to want to keep the head speed under 1800 or sure. So in that case, I would be looking at using the 6.9:1 gear ratio. This will give you a practical head speed of 1700-1800 rpm and have the engine revving at 11730-12420rpm. To get this ratio, you need the 90T main gear and 13T pinion.

Batteries. YOu are on the right track. Either Nicad or NiMH will serve you well. Just make sure you do get the Sub-C NiMH as the stock CDI pulls 1-1.2 amps when up to RPM. Standard AA NiMH will not take that kind of amp draw very well.

Other than that, your setup looks good. Take your time with the tuning and learn the engine.

Welcome to the hobby!

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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06-03-2010 01:39 AM  7 years agoPost 3
teekay18

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Northwestern Ontario, Canada

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Thanks for the reply James!

I bought mine at Christmas time, it came with the 14t pinion and 84t main gear. I probably won't use the woodies for long, just thought I'd start out with cheapies since it's my first heli, after several flights and I get the hang of it I'll be slapping on some RotorTech CF 640mm. Some have said to use 6.9:1 ratio for 640mm blades while others have said 6.42:1 for 640mm blades, thats why I'm having a hard time deciding. I was hoping the 6.42 ratio would work, then I'd only have to swap out the main gear. I'm willing to get the 13t pinion and 90t main for 6.9 ratio if thats what my heli will prefer.

As for the batteries, I was also wondering if either the ignition batt or receiver batt draws more power then the other one per flight, meaning should one of the packs be larger than the other one or will I be okay just getting 2 of the same batteries ? As for now I think I'll stick with NiMH for the higher capacity, some day I'll be getting a generator for my heli and will scale back the size of my packs.

Tyler

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06-03-2010 02:25 AM  7 years agoPost 4
James Kovach

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canton, oh - US

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Just stick with the 6.4 ratio then. Just resist the urge to up the RPM. 1800 rpm @ 6.4 will get you 11,520. That will be fine for flying around and such. When you goto the 640 RT, then up the rpm to 1900-1950 and you should be all set. The stock engine might bog here and there with the longer blades, so you are going to have to be gentle on the collective is all.

*disclaimer: These are my opinions. Agree or disagree, Your Call :)
Let'r Rip Tator Chip

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06-03-2010 02:57 AM  7 years agoPost 5
teekay18

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Northwestern Ontario, Canada

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Sounds Good!!! Thanks again James.

Would my radikal perform better with the 620 RT's versus the 640's ?

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06-03-2010 04:14 AM  7 years agoPost 6
woody37

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McAllen, Texas

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Great advice Sparx.... I'm running 6.42 on mine and running 620's at 1900 currently. I'm going to set my governor at 1950 with a engine rpm at 12500. I just got in my Stator Gator.... Pretty cool

A great big welcome to the hobby from me as well teekay... Excellent choice in helicopter selection.

Woody

A bad day of flying or fishin is better than a good day at work!

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06-03-2010 06:13 AM  7 years agoPost 7
teekay18

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Northwestern Ontario, Canada

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Thanks for the welcome Woody!

I've liked century ever since I wanted a rc heli. I remember wanting the century hawk 10 years ago. Last spring I bought 160 acres of property and since then have wanted to get aerial photos of it. About six months ago around Christmas I got one of them small GoPro HD cameras when an idea struck me. I had the thought about mounting the camera on a rc heli and taking my own photos and video of my property. So the first place I went to was Century Heli to see what they had to offer these days, and to my surprise they just came out with a new gasser The Radikal of course! It just so happened that I had a decent chunk of change to spare, so I bought one! Then decided to also buy a Predator NX v2.0 instead of electronics and such for the radikal. Fast forward 5 months to now, finally almost have the radikal ready to fly. Predator is still sitting in the box waiting for me to have enough money to buy electronics for it. Yup, I like Century, and I'm still yet to fly a real rc heli, let alone one of theirs, so lets hope I still like them after I actually fly their heli Whenever I get the radikal broke in and ready to fly, I'll be mounting that GoPro on there and I'll be up shouting some video and photos of the property.

Tyler

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06-03-2010 01:00 PM  7 years agoPost 8
Zman

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Florida

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I think Sparx's advice on your questions are pretty accurate. Since this is your first heli, does that mean you are first stages of learning (hovering). If so, no need to jump to cf blades and high head speed, 1700-1800 with the woodies will be fine. Just make sure the woodies are balanced well

BTW: for your first heli and gear, I can tell you spent some time getting the right stuff, great job on researching!

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06-03-2010 02:03 PM  7 years agoPost 9
rotormonkey

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Ottawa, ON - Canada

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great job on researching
Let me second that. All I can say is WOW. I did my homework too before buying my first heli (a little anyway) and I didn't have a FRACTION of the knowledge that you clearly have. Kudos to you for researching and knowing what you're getting into. If you didn't say you'd never flown before I'd have never believed it reading your post. You're clearly light years beyond most newbies already. Good job.

I'm assuming since you've read quite a bit that you should probably pick up a sim yeah? Not to harp, but it'd probably be a good idea rather than trying your first time with a big expensive heli. Just throwing it out there.

Again, good luck to you. You picked a hell of a heli. You're gonna have fun!

If it can't hover, it ain't worth flying.

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06-03-2010 07:22 PM  7 years agoPost 10
teekay18

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Northwestern Ontario, Canada

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Hello Zman and Rotormonkey,

Thanks for the great compliments guys, I appreciate it!

Zman, Yes this is my first heli, that was the reasoning behind getting cheap woodies to start with in case of any mishaps at the beginning, once I get the feel and am confident enough I'll be switching to the RT CF blades. Century claims their Aerotech woodies are already weighted and balanced, but I'll still balance them to make sure of course.

Rotormonkey, No worries my man, I got that covered, I purchased Phoenix Flight Sim a couple days after purchasing the radikal, so I've been siming for the past 5 months. I'm pretty confident that I should have no problem with the real deal as long as I have it all setup correctly.

Again, thanks guys for the wonderful compliments. I do a tremendous amount of research on everything I get into and I am very meticulous with things and also like to take my time, all good traits to have for rc helis from what I can tell, the only important thing I'm missing for this hobby is Money

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06-03-2010 07:47 PM  7 years agoPost 11
rotormonkey

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I'd be willing to bet you'll find that's the one thing we're ALL missing here

Depending on how you enjoy the hobby though it doesn't have to be too expensive. Personally I tend to have one or two helis, and they keep me happy. Now I've got a Raven and a Radikal, and that's enough for the time being.

If you don't go nutty on many different helis, then really the initial investment is all that really gets you. After you've spent the $1500 on a nice heli, you just fly it and don't end up spending a ton (that is after the initial learning curve).

No more expensive than golf if you ask me. After the first investment (clubs/heli), it's just a few bucks here and there to keep things running.

Unless you're a guy that likes to buy heli after heli after heli. Then you're really in for it! :P

If it can't hover, it ain't worth flying.

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06-03-2010 08:07 PM  7 years agoPost 12
teekay18

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Northwestern Ontario, Canada

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Definitely agree with you there Rotormonkey.

Thats why I went with the Radikal, the upfront cost for gassers might be more, but after the initial purchase, all you have to do is fuel and fly.

I already have 2 gassers, radikal and predator Some way think I went overboard buying 2 gasser helis before ever flying a rc heli, but I have my reasons, one of them being my brother is also learning rc helis along with me, so now we'll each have a heli to fly

If money is tight, can't really go wrong with the gasser, gives you maximum flight time for minimum price!!

I could see myself being one those guys that likes to buy heli after heli Someday I'd like to get an electric as I do have an interest in 3D flying.

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06-03-2010 08:12 PM  7 years agoPost 13
Zman

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Florida

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You also picked two helis that have reasonable repair cost! so again good job on the research.

You and your brother should consider trying to make it to IRCHA in August. Besides the fun, it will be well worth your time, as there will be plenty of us gasser dudes there to help with any questions or problems you may have.

Z

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06-03-2010 08:24 PM  7 years agoPost 14
teekay18

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Northwestern Ontario, Canada

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Zman, I want to go to IRCHA so bad, I've always dreamed of going there and it's only a 15 hour drive from where I live too which isn't that bad. But sadly I don't think I will be able to this year, time and money just aren't on my side. It starts the day after my birthday too being at IRCHA for my birthday sure would've been nice birthday present.

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06-03-2010 08:33 PM  7 years agoPost 15
rotormonkey

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Ottawa, ON - Canada

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Someday I'd like to get an electric as I do have an interest in 3D flying.
No need to go electric to fly 3d. I'm a 3d guy myself (or at least I'd like to think so). The Raven and Radikal have been plenty capable of doing anything I've thrown at them.

The Radikal is a little slower than a nitro or electric ship, but still able to do it all. That includes flips, rolls, loops, tic tocs, funnels, pirofunnels, piroflips, backward flight upright and inverted, and a whole host of other stuff I can't do I'm sure.

You're going to love that heli I think.

And hey, if you're on phoenix, we should hook up some evening and fly together!

If it can't hover, it ain't worth flying.

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06-03-2010 08:34 PM  7 years agoPost 16
Zman

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Florida

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I here ya. I will be going and its about a 16 hour drive but sometimes you just have to bite the bullet .....anyway, understand the money thing but if find some hidden in a jar in backyard bring it on!

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06-03-2010 08:48 PM  7 years agoPost 17
teekay18

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Northwestern Ontario, Canada

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Someday I'd like to get an electric as I do have an interest in 3D flying.
I guess I should have worded that differently, I'd like a smaller electric that would be my plug and play heli to take and fly where the gassers can't Didn't mean to imply that gassers can't do 3d.

I'm down for flying on Phoenix, I use the same username, teekay18, what name do you fly under and about what time do you usually sim at ?

I'd love to find that miracle money jar Zman

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06-03-2010 08:59 PM  7 years agoPost 18
Zman

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Florida

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Well, either way, we are a post or pm away for helping in anyway we can. Just shout out!

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06-03-2010 09:21 PM  7 years agoPost 19
teekay18

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Northwestern Ontario, Canada

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Thanks Zman and everyone else!!

You heli guys are sure a group of nice people that are always willing to help out the new guy. I'm sure I'll have more questions in the near future

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06-03-2010 09:55 PM  7 years agoPost 20
rotormonkey

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Ottawa, ON - Canada

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I go by rotormonkey in phoenix too. I think I might hop on now. Shoot me a PM if you want me to make a room and meet you in there. I'll likely be on and off for the evening.

If it can't hover, it ain't worth flying.

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Radikal Gear Ratio and Batteries
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