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HomeAircraftHelicopterBeginners Corner › Headspeed???
10-15-2005 03:03 AM  12 years agoPost 1
csc

rrApprentice

Cave Creek, AZ

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I have a Hirobo Shuttle RG with an OS .32 sx-h engine. Ideally, what headspeed should I be at for hover? I tached it today and it was 1924 and I didn't even leave the ground Throttle stick didn't make it to 1/2 way point. I know this is too fast but what should I be aiming for? Suggested Pitch/Throttle curve?

Thanks,
Clark

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10-15-2005 04:07 AM  12 years agoPost 2
DSW

rrApprentice

Oviedo, Florida 32765

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CSC,

What kind of tach is that in your picture?

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10-15-2005 04:37 AM  12 years agoPost 3
csc

rrApprentice

Cave Creek, AZ

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DSW,

It is a Sigma Sport BC800 Bicycle Computer. I bought it yesterday at REI for $20. As per many threads here, it was an easy install and works great.

Clark

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10-15-2005 04:38 AM  12 years agoPost 4
csc

rrApprentice

Cave Creek, AZ

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T. Fiddler,

Thanks for the info, that is just what I was looking for.

Clark

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10-15-2005 04:12 PM  12 years agoPost 5
EMS1

rrNovice

Ft. Inn, SC - USA

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Sigma Sport BC800 Bicycle Computer??? where can you get that? I tried searching on here for the posts you were refering to, but had no luck.....


.

Hey! I can finally hover........crap!.......nevermind

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10-15-2005 04:24 PM  12 years agoPost 6
EMS1

rrNovice

Ft. Inn, SC - USA

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I found it and ordered it. Do you have the instructions on setting it up???

Hey! I can finally hover........crap!.......nevermind

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10-15-2005 05:05 PM  12 years agoPost 7
csc

rrApprentice

Cave Creek, AZ

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EMS1,

http://www.runryder.com/t52924p1/?h...t=bike+computer

http://www.runryder.com/t52924p1/?h...t=bike+computer
Enter site and click on "Upgrades" => "Headspeed Tach" for a write-up

Here is what I did:

For me, the tricky part was how to mount the sensor. There wasn't any easy way to mount the sensor to my Shuttle RG so that it would extend over the main gear. Actually, I could only mount it on one side of the frame because of obstructions on the other. So, I ended up making a small aluminum "L" bracket to which I epoxied the sensor. Notice where I dremeled the case of the sensor to clear linkage. Test to be sure the sensor does not obstruct any linkage before permanently mounting!

Once the sensor was mounted, I needed to position the magnet on the main gear. The magnet that comes with the Sigma Sport BC800 is long and supposed to attach to a wheel spoke. Instead, I purchased a package (2) of rare earth magnets (very tiny, but powerful) from Radio Shack and used one of them on the main gear (you can see it in the pic). For balance, I found a washer that was very close in weight to the magnet and epoxied it opposite (180*) from where I epoxied the magnet.

To shorten the length of wiring, I ended up just cutting the wire and soldering them together with some heat shrink tubing to cover and then zip tied it to the frame.

The computer mounts to the boom as shown very easily with the included bracket and peel n stick tape. It also has a rubber retaining ring that goes around the boom. The mount is very stable and firmly attached. The computer module detaches from the mount with a twist so you can view/manipulate it up close.

Here are some instructions I received from another RR member:
1. glue the sensor magnet (it can be any small magnet) on the main gear. ( you should also glue a lead pellet of the same weight on the opposite side of the main gear to balance the magnet. Like balancing a tire.)
2. mount the sensor on the frame with a 2-3mm clearance to the magnet when you spin the gear.
3. program the diameter as 1666 (check this number, I am not sure)
4. mount the Sigma somewhere on the tail boom.

BE VERY CAREFUL when you read the RPM because you have to hover the heli quite close. I used it to tune the engine initially. It is much easier and safer to have someone to tach the RPM for you with a optical tach.

If you are new to this, I would not suggest you to hover the heli 6-8 feet from you and trying to read a number. You should not hover anything less than 15 feet from you even for a 30 size heli!
Once everything is mounted and ready to go, you'll need to program the computer following the directions. Set the wheel diameter to 1667 and the speed to kilometers per hour. This will read out rpm on the speed screen. As shown in the original pic, my MAXSPD rpm was 192.4. Actually, this is 1924.0 rpm. When running, actual rpm will be displayed above this. Pretty cool!

Hope this helps, good luck!
Clark

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10-15-2005 07:53 PM  12 years agoPost 8
EMS1

rrNovice

Ft. Inn, SC - USA

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Great. Thanks csc. I really appreciate your response.

Hey! I can finally hover........crap!.......nevermind

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10-15-2005 11:13 PM  12 years agoPost 9
csc

rrApprentice

Cave Creek, AZ

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EMS1,

No problem. I flew it today and compared it to a handheld tach and it was right on. Now, we'll just have to see how it holds up.

Clark

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10-16-2005 01:04 AM  12 years agoPost 10
uh60ce

rrApprentice

Atlanta Idaho USA

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that little tach works great! a little hard to read in flight, but since it remembers what the max rpm was...well how cool is that! very acurate too, we compared it to my hand held optical tach and it was about as close as anything ive seen. Definitely worth the $$

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11-22-2005 04:54 PM  12 years agoPost 11
csc

rrApprentice

Cave Creek, AZ

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Just a follow up on the Bicycle Tach setup...

I have flown it a bunch now and initially had a problem with the tach blanking the screen during flight. I discovered that vibrations were affecting it. I solved this by putting a small piece of receiver foam between the back of the unit and the boom for cushion. I have not had any problems with it since. Works great and is very accurate.

I have recently acquired a GV-1 Governor that I will be installing on this heli soon. It will be interesting to see if there is any difference in the rpm readings between the units. Stay tuned, I will let you know...

All in all, not a bad investment for $20.

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eShuttles

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11-22-2005 05:01 PM  12 years agoPost 12
Pluggin

rrNovice

Bueno Aires, Argentina

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KMH is equal RPM?

Thanks

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11-22-2005 05:12 PM  12 years agoPost 13
csc

rrApprentice

Cave Creek, AZ

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Yep, the computer has to be set to KPH and a wheel diameter of 1667. I can't tell you why, but it works.

Be sure to read the other links posted at the beginning of the thread. They will help shed some more light on the subject. There have been several posts regarding this application, do a search. Also note that the rpm reading in the pic is 192.4, this equates to 1,924 rpm. The readings on this unit have been verified using a handheld tach.

It is a simple project, good luck!
Clark

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eShuttles

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02-23-2006 04:54 AM  12 years agoPost 14
Pluggin

rrNovice

Bueno Aires, Argentina

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I install the VDO c08 cytec computer in my heli. The magnet is on the main shaft and the computer is configured with 1667 wheel size and kmh.
But the maxspeed never rize 72.01!!!
Please I need some help.

Regards

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02-23-2006 05:11 AM  12 years agoPost 15
csc

rrApprentice

Cave Creek, AZ

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Check to be sure your sensor is very close to the magnet to read correctly. My gap is very, very small.

______________________
eShuttles

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03-31-2006 03:11 PM  12 years agoPost 16
SkateFreak

rrElite Veteran

Cambs UK

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Hey Pluggin.
The Bike Odomoter has to be capable to reaching around 250kmh for this application.
As you can imagin many cyclists never reach this fantastic speed so many odomoters wont register over a certain speed.
We want an odomoter capable of 250kmh because we can use this translated into a headspeed of 2,500 so it will be capable of reading up to and above 2000

Best regards

-Jvr

Non-3D heli pilots are planker spys trying to bring down the heli community from the inside - Topher

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03-31-2006 03:40 PM  12 years agoPost 17
Pluggin

rrNovice

Bueno Aires, Argentina

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I know what you mean. A lot of post said use the VDO08 or VDO10, the same I use. But it doesnt work for me.
Both have the same problem, only measure 72.01!!!

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04-03-2006 08:31 AM  12 years agoPost 18
Toby Macknight

rrNovice

Hertfordshire UK

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I used a BC800 as in the picture at the top on my raptor and I worked great the first flight. On the second the main spur threw both the magnet and the counter weight right off!! Gone! Now i need to get a new magnet and find a better way of holding it on. I put the magnet up against the ridge and used epoxy resin to hold it down. Was surprised to see it missing after my second flight.

The only way to get rid of temptation is to yield to it... I can resist everything but temptation...

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04-04-2006 02:02 AM  12 years agoPost 19
Yug

rrMaster

UK. Herts

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Drill a hole and epoxy the magnet in. You'll also need to add a counterbalance.

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04-06-2006 03:02 AM  12 years agoPost 20
billm

rrElite Veteran

Liberty Lake, WA

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I'm just looking at ways to install the sensor
This idea is cool!
I just ran down to my local REI store and pick two BC800's.
A real killer price of $9.93 ea!
Now all I need to do is find a way to mount the sensor. I need to play with several types of magnets, as the spacing from sensor to gear is about 6mm.

Tiger 50/OS50 Hyper, Venture 30/Toki, Ninja Pro/Os 32 redhead

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