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HelicopterGasser Model RC HelicoptersOther › New Gasser Flyer Futura needing some advice?
11-23-2006 10:25 PM  11 years agoPost 1
djtilko

rrApprentice

United Kingdom Leeds

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Hi

I swapped my Century Swift today for a Robbe Futura gasser! need to find some things out about it as the owner was not very clued up about it! I think it was third hand not second hand!

Anyway I found out the undercarriage struts arent very strong as when I pulled the starter cord to get it going they broke on one side of the undercarriage any recommendations for a stronger than stock alternative?

Heli didnt come with any manual or instructions so need to know what kind of pitch settings to go for any help with that too would be much appreciated as would any suggestions regarding gassers in general, eg the throttle setup, curves to set etc?

I did some homework on the Robbe helis and I could only find good things stated about them is it a good heli?

Dave

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11-24-2006 04:20 AM  11 years agoPost 2
rbort

rrProfessor

Franklin, MA - USA

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Hopefully someone local to you can help

Robbes are extinct in the US as you can't get parts for them easily and my friend who is a dealer that used to fly them cannot easily get parts for them any more he stopped stocking them.

He used to have the gasser years ago and with the tuned pipe that thing was a rocket ship.

Sorry can't help you much with your question besides this as I never owner one, only seen his but that was some years back.

-=>Raja.

MA 1005 Hanson 280, 4158 flts
Spectra 27 3DMax, 3232 flts
Whiplash V1 Hanson 300, 1485 flts
Whiplash V2 Hanson 300, 256 flts

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11-24-2006 05:17 AM  11 years agoPost 3
Jarno

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Finland

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landing gear

You might want to check out this: http://www.ercmarket.com/product.ph...6&cat=74&page=1

This landing gear must be one of the toughest there is. I'm very happy with those.

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11-24-2006 06:59 AM  11 years agoPost 4
Stet

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Key Largo FL

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put your foot against the frame so you are not pulling against the landing gear

The carbon skids eRCMarket sells are very nice. If you want a cheaper route, the MA tuff strut 1 would be a good choice

keepin' it real

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11-24-2006 10:16 AM  11 years agoPost 5
Scott99

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Nelson, New Zealand

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Futura Gasser

Check out my gallery for mods I did to one that has worked out ok for adjusting and "locking in" the drive belt alignment - not wanting to alarm you, but you will need to pay attention to this on the gasser Futura set up as the torque of the zenoah can be enough to shift the alignment of the front and rear pulleys, which then makes the belt rise up the rear pulley and into the frame set......
As Stet says the Min Air tuff strut sets are very good.

Take my word for it, take the time to make similar mods, if there are any scratch marks around the back of the sideframes this would be an indication that a previous drive belt has been fried before in which case the reinforcing wire comes to bits and thrashes around in there

In my experience the plastic base frame as strong and robust as it is, is not quite rigid enough for a gasser conversion hence the deveopment of the Nova Quattro. - a CNC machined base plate with provision for adjustments would be really good for the Futura Gassser........

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11-24-2006 10:33 AM  11 years agoPost 6
djtilko

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United Kingdom Leeds

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Scott

Cant find any pics in you gallery of the pulley mod! thanks for the heads up though!

where did you get the muffler and what make is it etc?

Dave

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11-24-2006 10:50 AM  11 years agoPost 7
Scott99

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Nelson, New Zealand

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Futura Gasser

They are there, the last 5 pics are in fact pics of my now sold Futura gasser. The other pics are my recently built Predator

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11-24-2006 11:28 AM  11 years agoPost 8
djtilko

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United Kingdom Leeds

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Sorry Scott I understand now I think! so you made up the base plate to enable adjustment to the engine pulleys to make them run truer? I have noticed on the one I got that the belt does have some very slight burn marks on the edge, so perhaps when its running there is a problem.

Will look into it more closely tonight.

The plot thickens! what did you think to your Futura was it a good machine?

Dave

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11-24-2006 11:32 AM  11 years agoPost 9
Stet

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Key Largo FL

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if the pulleys are true, the belt will run up or down depending on which way it is flipped over. also, it will run up or down depending on which direction you rotate it. when you spool it up, you want to make sure you watch it to ensure it does not run up into the frame. you can test it by rotating the clutch bell in the driven direction and see where the belt goes. If it stays put and does not climb up you will be in good shape

keepin' it real

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11-24-2006 12:02 PM  11 years agoPost 10
djtilko

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United Kingdom Leeds

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Thanks for that Stet will watch out for the belt riding wrongly. If it does ride up or down I need to adjust the engine mounting then?

Dave

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11-24-2006 06:01 PM  11 years agoPost 11
Pinkbike

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UK

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Hi djtilko,

I have a Futura SE Gasser. I swapped it with a good friend of mine who I trust implicitly. The model has never been crashed and has been converted expertly. Regarding the underside, get yourself some ally plate (about 4mm thk x 60mm sq)and fit it between the skid and main frames. Mount the starter coil to this. Also fit another strip of the same plate to the rear of the mainframe/skid assembly. I will post pictures if you want me to.
Other than that the SE parts can be purchased through Midland Heli very easily and are in fact quite cheap. All I have to say about the Futura gas conversion is that it is an excellent model and a great conversion. Spend some time working it out and it will reward you in buckets. Also it is becoming a rare beast and not too many people have a bad word to say about it. It is great as a gasser and flies as well as my old MA SE99!

www.kickstartphotography.com

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11-24-2006 06:58 PM  11 years agoPost 12
Stet

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Key Largo FL

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The engine should mount square by default, if the belt rides up first flip it over and see if that fixes it.

Regarding the plate mentioned above, I have a spare if you want to try that. It would keep things aligned and provide an additional mount point.

keepin' it real

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11-25-2006 12:28 AM  11 years agoPost 13
djtilko

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United Kingdom Leeds

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Been looking at it again tonight Ive got the servos all more or less sorted out and it should be ok to fly its setup at the moment with 8 degrees of positive pitch about 6 negative is this a good figure to have the initial flights with?

Took me a while to work out how the collective works on this beasty but its sorted now!

Regarding the belt, I think its running a little too low but not quite catching the frame about 2 mm of it though so maybe it needs some adjustment to bring it further up, I have tried spinning it but makes no difference still stays in the same place, not touching but near.

Would like some pics Pinkbike of the plates you mentioned if its possible.

Thanks one and all for all the tips.

Im pretty sure I will get there in the end with it but theres noone locally to turn to for advice on gassers round where I fly, and not having the manual doesnt help.

The engine is very easy to start and seems to run ok as far as I can tell.

Shame I cracked the undercarriage starting it though Ive ordered a new quick uk heavy duty one so I hope that sorts it.

Only think Im really concerned about on it is the belt running true enough.

Dave

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11-25-2006 04:46 AM  11 years agoPost 14
Stet

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Key Largo FL

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Actually it is the belt riding down off the rear pulley you have to worry about. So one thing you want to do is run the front pulley as high as you can. I went as far as to sand down the top of the front pulley so I could ride it higher.

keepin' it real

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11-25-2006 09:02 AM  11 years agoPost 15
djtilko

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United Kingdom Leeds

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Stet yes the rear pulley is the one that seems to be giving the problem. The belt is running at the very bottom of it, but still not touching the frame although mighty close. Will spool it up later and see exactly where its running with the engine going.

Cheers
Dave

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11-25-2006 12:14 PM  11 years agoPost 16
Pinkbike

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UK

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Here are two pictures of the underneath. Using this plate arrangement allows you to still use the standard undercarriage.
You can also use the pull starter with confidence.

www.kickstartphotography.com

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11-27-2006 09:56 AM  11 years agoPost 17
djtilko

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United Kingdom Leeds

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Pinkbike

Thanks for the pics! will sort this out as I go on. I took the gasser for its first flights on Sunday morning, and I found the gy501 gyro to be knackered, looks like the previous owner had been fiddling with it as there was epoxy on some of the sensors screws so he had had it appart! when I took of with it the tail was all over the place! couldnt stop it wagging till I got the gain down to only 5% and even at that the damn thing was still wagging! Not only that but it was trying to swing wildly about, I thought the gyro was setup in the wrong sense but no it was right, anyway after getting it down with it piroing randomly about I found the tail gearbox was cracked, whether this was done before I bought it I dont know the crack was so fine I couldnt tell.

Anyway took it home and fitted a csm 420 gyro and ran some cyano round the cracked tail box, and went back for some more! now the gyro works very nicely, but the gearbox aint right! its cracked again the cyano didnt work! when I stripped down the gearbox the pinions were not tight there was no locktite holding them on tightly to the tail shaft so perhaps this is one reason the gyro was behaving funny? Dont trust that 501 gyro now though, so I will be sticking with the CSM 420.

I did manage to keep it in the air long enough for someone to tell me the head speed was at 2k which is a bit high? so the throttle curve and pitch curve needs some adjustment! at the moment its only setup with 8 degrees of +pitch and I reckon it needs 10 - 12 degrees?

Good points are: it handled well on collective and the engine seems good, gyro now working nicely and I havent smashed it to bits yet! so thats a bonus! all I need is a new plastic gearbox case set which is on order and then next time things should be fine. It can only get better.

Slightly annoyed by the gyro being messed about with by the previous owner as if he had been straight with me I would have still gone with the deal its still a bargain for a swap for a Century Swift! but the thing was in a dangerous state like it was, I just wouldnt take appart a gyro to mess with it, and it had been taken appart as there was epoxy holding one of the screws in the case of the sensor.

Anyone know if Futaba would still service something like this? I dont believe the 501 is still in production.

Thanks for all the help guys! I am getting there.

Dave

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12-02-2006 12:07 PM  11 years agoPost 18
Pinkbike

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UK

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djtilko,

Sounds like you are having fun with this model.
If you ever think of replacing it I am going to sell mine.
I will post the ebay link in the gasser section when I get around to taking the pictures.
All is needed is a crystal and this one has never been crashed and has top quality radio installed.
The whole reason in my opinion for flying a gasser is that you do not need to fiddle with anything. Just every now and then check nuts and bolts are still tight!

www.kickstartphotography.com

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12-02-2006 09:56 PM  11 years agoPost 19
erichevy

rrVeteran

Zevenhoven The Netherlands

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Hello Dave,
What size mainblades do you have?
I've got a gold gasser with 1.80 rotordiameter (800mm sab blades)and a G230puh.
21 tooth clutchbell and 42 tooth second gear.
I run 1150 rpm's on the head.
running +10 pitch and +12 for throttle hold, this baby auto rotates very easy.
I suspect you got the smaller blades, based on the fact you where running 2K rpm's.
Eric.
And oh, btw the former owner did run this Futura with 1.60 rotordiam. and with 26 clutchbell/ 48 tooth sec. gear.
And have a look at: http://robbeusa.com

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12-05-2006 12:49 PM  11 years agoPost 20
djtilko

rrApprentice

United Kingdom Leeds

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erichevy

Sorry for the delay in replying but Ive been trying to raise more funds, as I am with the help of Pinkbikes Futura still trying to get sorted.

Unfortunately I cant give the blade sizes etc as the last attempt at flying, was a total disaster, the blades are now about the size of a rap 30!!!

Fixed up the gearbox took lots of time to get it silky smooth sorted the gyro out no wag etc and took of into a tail in hover, everything ok, slight vibes on tail boom, attempted to turn the heli after a couple of mins of tail in and as soon as I got the nose coming round something went wrong! it all happened so fast I dont know what it was! but thinking about it I believe it was an interference glitch only guessing though.

Anyway it gave a mighty lurch down to one side and the damage wasnt pretty, blades gone flybar bent, boom tail drive shaft stripped crown gear and some stripped servos.

So kindly Pinkbike has agreed to sell the Futura he has which is a well sorted one and I will keep this damaged one for spares.

Let you know how I get on later!

Dave

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HelicopterGasser Model RC HelicoptersOther › New Gasser Flyer Futura needing some advice?
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