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Midland Helicopters . HeliProz . ZoomsHobbies

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Century Hawk - Falcon - Raven - Predator > Century Gasser Buildup-UPDATED Feb '06
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

So far....

'gator and gv-1 is the hot ticket. TJ with magnets.

No, I'm hoping nobody else ribs me about my gasser being "belly up" at the moment. I honestly don't want to go fly anything else.....go figure??
08-13-2004 Over year old.
 
 
spongebob1871
Senior Heliman
Location: Yokota Air Base, Japan

finally got it off the ground

after almost three months of building, i finally got to fly. well sort of. i was told to keep in close to the ground due to the major difference between the power of my venture 30, and the pgasser. also due to the fact that a cost would be much more. i took the advice and kept it about 6 inches off of the ground. which proved to be very difficult. the controls are so much more sensitive. i was shocked at how hard it was to handle. but after the first tank things were getting a bit more predictiable. after the second tank i could almost keep it in one spot.
then i went on vaction to the states, and took my pgasser with me. let me say, that this thing set off all kinds of alarms when going though customs. but no major problems. i met HRPULL in St. Louis, we compare our gassers, and did a bit of flying. i bumped the collective a bit too much, and off it went. before i knew it i was about 3 feet off of the ground. and to my surprise, it was much easier to control. so i hovered for 3 tanks. my steadyness improving with each tank. then i started to get brave. i would go up to about 15 feet, and then about 100 feet forward, and then back to me. which is a big improvement. since i only hover right in front of me. all was going well, and then the HH on my gyro, decided not to hold any more. which was a big shock since i have never flown without it. so i freaked out, and took a minor situation, and make it complicated. i moved the collective a bit too fast down, and then tried to correct, but it was too late. i bounced the gasser a couple of times, and then cut the engine. much too my surprise, i only broke one of the landing struts. two days later i was ready to go again. but i had to pack up, and head back to japan. what a great heli!!!! i love the way it flies, once i got it off of the ground.
08-13-2004 Over year old.
HOMEPAGE  
 
 
Stretched
Senior Heliman
Location: Mobile, Alabama

Glad to hear it wasn't bad.

Can I make a suggestion?

Turn the heading hold off until you get comfortable holding that tail on your own. Heading hold is a good tool, but can spoil you out of an important part of your learning curve. IMHO

If its one thing that I am pretty good at, its tail authority, and its because the first 3 helis I owned had piezo gyros. I never had ANY experience with a HH until my latest heli, (P-Gasser). Plus you'll expand your coordination because you'll develope that extra sense of controlling the tail along with the cyclic, vs. just concentrating on the cyclic and collective. Having that has gotten me out of loads of bad situations. And believe me I see my share!

I am sure a lot would disagree with me on this, but I think its an important part of learning to fly.

Just a thought......


Scott
08-15-2004 Over year old.
 
 
zoom
Elite Veteran
Location: Galveston, Texas

Hey guys, this is the gasser conversion I plan to do.

This maybe the route that I go with.
I looked up a few numbers myself.

http://morrishobbies.com/product_in...products_id=452

Comparison:

ys 61 st2= 19.1oz / 542.4g
ys 91 st4= 19.2oz / 545.8g

MVVS 1.6 gasser engine w/ignition = 37oz / 1050g

Difference of ~17.8oz that is just adding barely over an extra 1 lb. Not bad because my ys 61st 2 is only putting out 1.8 hp vs the MVVS 3.8 hp

This will put my metal frame Predator at 10 lbs 15oz. With carbon frames and lipo setup, This could be the lightest Predator gasser at 10 lbs 9oz. With 3.8 hp and at $2/gal of gas, this thing will be powerful, fun and economical.

The only issue I can potentially see is sorting out the headspeed. Even with 3.8 horses. This engines RPM tops out at 9000 rpm according to the factory, or is that only what they will warranty. I hear people are pushing the Zenoahs above what is recommended or covered by warranty. Just running the numbers, and please correct me if I am wrong, just get a headspeed of 2000 rpm, you will need a gear ratio of 4.5 : 1. This may make it difficult to find the appropriate pinion. I'm currently running 9:1 on my SE with the 90T main gear and 10T pinion. I guess I'll have to goto 720s and possibly sale the RT 700s.

Does Century or anybody sell a 20T pinion for the Predator?

The best thing about using this MVVS engine is being able to keep the lower frames and not having to rip the lower half of the heli apart.

Predator, Raptor 30, TRex CCPM 450TH, 3D Pro 400F
08-17-2004 Over year old.
 
 
Xnaron
Senior Heliman
Location: Edmonton, Alberta, Canada

[QUOTE]AGRAV8 Hardware........
You need to source yourself a 6 mm x 20-25mm long hex head bolt. Also, a flat washer for 6 mm. Grade 8.8. the kind you use a ratchet on. While your there, get a set of (4) 5mm X 15 bolts (again, the kind you can use a wrench on). Make this happen, Guys.......I ain't writing this to get any brownie points[QUOTE]

I bought the above and the bolts are too long. The 4 - 5mm x15mm should be 4 - 5mmx8mm. The 15mm are too long and bottom out before you can tighten the plate. The 6mm x 20mm is too long as well. It bottoms out. It should be an 6mmx15mm bolt. This might be covered somewhere else in this thread but I thought I would post it as it has cost me some agravation I wanted to get the fan mounted tonight... Oh well I'll pick the bolts up tomorrow... I'll use the rest of the time to read through this build

Brendin
08-24-2004 Over year old.
HOMEPAGE  
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Brendin

Sorry, Bud.....I was in reference to the overall length of the bolt including the head. I should have pointed that out better. I WILL go and edit it tommorrow.

Good luck on your build up. Sorry for the AGRAV8'N
08-25-2004 Over year old.
 
 
Xnaron
Senior Heliman
Location: Edmonton, Alberta, Canada

hehehe...no problem... me and a friend got a fair chunk of it built yesterday... two things I noticed so far. I am missing the bearings for the tail bell crank and the boom came with a dent in it and a bad hole cut in one end... Other than that things are going great. My friend got the runout down to under .002. Quite the process... we ended up having to tap the side of the clutch hub. I know this isn't the recommended way (or is it?) to do it but it was the only way we could get it to .002 and under. After we were done we measured runout on the fan, the clutch hub and the clutch itself. All were .002 or under so we hopefully should be ok...

Brendin
08-25-2004 Over year old.
HOMEPAGE  
 
 
spongebob1871
Senior Heliman
Location: Yokota Air Base, Japan

i need some help installing a optical sensor for my TJ Pro. i was going to use the magnet/hall sensor, but i just realized that both magnets are installed the same way. so i'm going the optical route. any recommendations for location? i thinking about cutting a hole in the fan shroud (top). if so, how close should the sensor be to the fan? how big should i make the reflective surface? do i need to polish the fan? or will the aluminum be reflective enough? how can i go about testing the sensor to make sure it is functioning properly?

PGasser
230 w/643 carb
GY401
9CHP
TJ Pro
Camper Fuel w/AmSoil
700 Mavvrik Carbons
110 Vblades
Raptor50 v2
09-14-2004 Over year old.
HOMEPAGE  
 
 
cwhover
Senior Heliman
Location: Albuquerque, NM

spongebob1871,

I don't have my gasser yet (carbon gasser on order!), but don't you want to install the magnets both facing the same on a gasser to account for the lower rpm?

Carl
VISA field rep
09-14-2004 Over year old.
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

Carl,
No, not with the RPMs we are running them at these days. Putting both magnets the same way would limit your max RPM to 10,250 which is only 1632 RPM head speed at a 6.28 gear ratio. The newer "3D" gassers are running more like 1950 RPM head speed which would be 12,246 engine RPM (at 6.28:1).

- John
09-14-2004 Over year old.
 
 
cwhover
Senior Heliman
Location: Albuquerque, NM

Thanks for the info John. I will probably be begging you for help once my new gasser gets here. Can't wait!.

Carl
VISA field rep
09-14-2004 Over year old.
 
 
helitroll
Senior Heliman
Location: Southlake, TX

magnets

If the sensor is picking up both magnets, how about changing the gear ratio so you get the same headspeed. Would that be out of the limits of the governor?
09-15-2004 Over year old.
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

> how about changing the gear ratio so you get the same headspeed.

The TJ doesn't have a gear ratio setting.

- John
09-15-2004 Over year old.
 
 
spongebob1871
Senior Heliman
Location: Yokota Air Base, Japan

i'm thinking about drilling one of the magnets out, and replacing it with another magnet in the correct orientation.
09-15-2004 Over year old.
HOMEPAGE  
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Been a WHILE !

Well, finished a beautiful Carbon Gasser just last weekend.....I'm going to create a new thread with some insight specific to the latest offering from Century.

Didn't want you guys to think I forgot about you.....

James
10-23-2004 Over year old.
 
 
Jetset
Senior Heliman
Location: Picton, Ontario Canada

A-arm part #

AGRAV8, is the metal A-arm part # HI6032A from Century?
I want to make sure I order the right one. This one is listed under the plastic levator set for the Predator in the Century store.
There's purple one underneath it as well. Part # HI6032AP
Thanks
Myles
11-21-2004 Over year old.
HOMEPAGE  
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Correct

you have the P/N for the metal A arms.

hi6032a is the natural finish

hi6032ap is the purple anodized


James
11-22-2004 Over year old.
 
 
ccm15
Senior Heliman
Location: Lake Ariel, PA

Head Button

Does anyone know what the Century part number is for the Purple head button on the gasser? I have the standard gasser but want to order the head button that is on the SE version.
11-26-2004 Over year old.
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

Here ya go.

MACHINED HEAD BUTTON PURPLE (METAL BLOCK)
Code:CN2215AP
Price: $9.95
11-26-2004 Over year old.
 
 
ccm15
Senior Heliman
Location: Lake Ariel, PA

Head Button

Thank you so much. I appreciate it.
11-26-2004 Over year old.
 
 
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HeliHobby . Ron’s HeliProz South . Century Helicopter

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Century Hawk - Falcon - Raven - Predator > Century Gasser Buildup-UPDATED Feb '06
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