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Model Rectifier Corp . PowerHelis . JR-Spektrum

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Gasser Model RC Helicopters > Spectra Kit arrived
 
 
pgkevet
Senior Heliman
Location: surrey UK

Build thread: I'm gonna have to think about this

After my last msg I went back and had another think.. I still don't fully understand and it'll probably take some sketches and worrying about it before i do:

So the foreward side gap was larger than the aft gap between fan and clutch driver (f-C gap), With the ladder supports unbolted and the whole top free to swivel that remains.
I did get out the spirit levels to check table, base plate on the skids and the top frame ..but they were all level.. apart from the effect of the gap.

Putting something in the space under the back ladder did correct an angular deformity but doesn't seem right. moving the engine in it's slots didnt make any appreciabel difference when the ladders were bolted down and couldn't affect things when loose.

In the end I loosened the top ladder bolts as well and then rebolted the front end down with a compressive force and then the back with a distractive force after sliding the engine full travel forwards

This last was contrary to what my logic told me but in the words of Sherlock Holmes " when every probable cause has been eliminated then however impossible the improbable must be true"

It is all aligned now..an even feeler gauge each side of the F-C gap and I put that down to the fact that there is inevitably some play around bolt threads in holes and we're talking thou's here

In the case of Preddie there isn't any better alignment than eyeball and the ESS system, The ESS actually is pretty rigid but I can accept it must flex and it's impossible to hold the preddie solo or still while trying to do up all those bolts and keeping it eyeballed.

At least here there is a system and ways of fiddling it - despite my failure to understand it. I'm going to leave it dogged down overnight, remeasure am and then take bolts out one by one and relocktight and replace.

Spectra wins this round hands down.. and in a few days i might have worked out how

pgk
06-12-2008 11:35 PM
 
 
pgkevet
Senior Heliman
Location: surrey UK

Build Thread - tail blades and control

Just for anyone leaping here wtout the previous bits.. this thread has followed the tempest head build manual (avalable on minairs website) with any issues and comments as I go with my build.

The only divergence is the fuel tank - dubro pending delivery.

This am I rechecked the fan clutch gapping - spot on and threadlocked everything. That meant I could attach the head now and I gotta say that this bird is strating to look really good.

I hold with my earlier comments about the blade grip/spindle shaft build and what I consider some nasty plastic parts but when you lean back and look at all this brushed aluminium and carbon you can save on this months Razzle.

Most impressive is the power train... that really is smooth in comparison with Preddie. My only concerns relate to the horror of trying to take some of this apart (inevitable).

The tail grips and rotor hub is standard stuff but finding a tool to do the grip nuts up with.. well some ingenuity may be needed if your toolbox doesnlt have a tube spanner with just the right wall thickness. I was a bit unhappy about the recommendation to use green bearing lock on the tail grip nuts. I did becasue I've experienced a tail grip detach and fly past an ear (scary) but I doubt those grips would survive any heat if needed to loosen the nut ever

The tail gear box is another MinAir winner.. On Preddie is was a piece it together job..but to be fair it went together well after I got my head around understanding it all.

The only issues I have here is back to using plastic parts with bits screwed in and CA near bearings. Why not just go all the way through with a locknut?

They do here in a couple of places only but not in others.

Oh, I did have a real problem with the bolt attaching the pitch bell crank. This is a special phillips bolt through two bearings with a spacer. The bolt was a dud. No points deducted for that - bulk manufacture of bolts and it happens. The head end spindle was flared so it wouldn't sit in the bearing but fortunately the bolt fit into my dremel collet and I could turn it down and square up with a fine file.

Points overall go to Speckie.. appearance and smoothness of action.

pgk
06-13-2008 11:53 PM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Sounds like everything is comming along nicely... Congrats,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-14-2008 12:25 AM
HOMEPAGE  
 
 
pgkevet
Senior Heliman
Location: surrey UK

Build Thread - tail

The tail case gear looks like a work of art and is way smooth. The boom looks skinny.. and it is - I measured it .. thinner than Preddie or even my 600 - so it goes with the lean greyhoud appearance of this bird.

The horizontal fin is a sort of vestigial acknowledgement to the idea of a horizontal fin and looks like ti's going to snap the first time you catch it on a jumper. The vertical fin is sleek. It doesn't look long enough to give rotor clearance but that is an optical illusion.. there's just as much clearance as with the Preddie - although Preddie's vert fin looks like you could impale a passing puppy on landing and fly away undamaged.

Otherwise I didn't enjoy this part of the buld one bit. The pushrod holders have to be the most unusually unnecessary design I've come across and the designer has carried on with the bizarre at every opportunity:

The tail box is designed to attach to a clamp system at the boom end. This is straightforward to attach to the boom (except that MinAir's manual mixes up left and right) but for the life of me I can't see why they didn't use simple locknuts instead of threadlock nuts here - they do at the other end!

Once on and snagged down loosely the tail gear box is shoved in and impales the torque tube connection. The you have to line up the tail box with holes in the boom and screw through. The manual tells you to be careful of the threads inside.

The advice and parts supplied tell you to take an M3 bolt, put an M3 washer on it and then an M2.5 lockwasher

- DUH! Hello!! - It's an M3 bolt. Why do you give me an M2.5 lockwasher?

OK so after pratting baout getting more and more angry at one's inability to hold this thin piece of tiny metal and screw the bolt onto it it becomes obvious that you're going to have to tap it on with a bit of tube to start it off. Let me tell you.. while I'm sure every expert here has no trouble just slipping these on... Well in my case, being careful it proved impossible not to burr those bolt threads.. and at the end of all that I don't even understand why the damned things are there. The bolts (correctly measured\) will not snug down tight enough to lock that wssher and I ended up being careful with theadlock.

This is followed by a nightmare of fiddling to snag the gear-to-clamp-screws through and hang a nut on them. I had plenty of time to consider where I went wrong in life, plan my retirement and grow a moustache before I got them all. If I ever bend this boom I'm going to cry...

A Pod with a boom becomes a Heli and suddenly this is looking like a heli.

But I'm giving this round to Preddie..it might not be as technically advanced but it's a darn sight more practical.

pgk
06-14-2008 11:18 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Tip time

1) Buy a set or two sets (one spare) of JR rubber landing gear dampeners, model number JRP960117. They raise the model up by 10+mm and they also serve as breakaway of the gear in case of crash to minimize damage. Your tail will come off the ground a bit more with them, I got them on mine, check my gallery to see a picture of them.

2) DO NOT overtighten the screws that go into the sides of the tail case and into the tail box. They are there as a security measure to stop the tail box from pulling out during extreme maneuvers (it would never come out with me but some 3D guys push envelopes to the max) and they are not intended to be super tight as you can strip them. Just snug up with locktite is good enough. If you find the tail case rotating on the boom down the road, instead put some masking tape below the black clamp and that will stop it from doing so. Just a future tip.

Keep up the good work, you're almost there!

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-15-2008 03:30 AM
 
 
pgkevet
Senior Heliman
Location: surrey UK

Tips are always welcome

pgk
06-15-2008 06:26 AM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

EDIT: dangit, I posted in the wrong thread again - though this part does apply...

you guys are sure making me want to be part of the "I own both" club!

...yep...
06-15-2008 07:04 AM
 
 
pgkevet
Senior Heliman
Location: surrey UK

Quote 
you guys are sure making me want to be part of the "I own both" club!

The offer applies that you should research both by coming over here and setting them up for me
...and you get tuning practice!

pgk
06-15-2008 09:08 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Will you be covering travel expenses?


Nick Crego
I swear to God, I'll pistol whip the next guy that says Shenanigans
06-15-2008 01:53 PM
 
 
pgkevet
Senior Heliman
Location: surrey UK

<<Will you be covering travel expenses?>>

..if I was gonna do that I'd just bring me and helis over there!!

How about this: All the tuning gurus come over and the one that gets it best (in everyone's opinion) gets their fare paid.. and all the others chip in for it 'cos they got it wrong?

Do you use the expression 'Put your money where your mouth is?'


Or a more popular idea might be a tuning seminar - say Jamaica - where we all turn up the same fortnight and get shown to to tune a heli comone brings.. keep tuning it, resetting it and so on until everyone agrees and everyone can do it, sober or not...just make sure you got lots of spares for when my turn to fly...

pgk
06-15-2008 03:27 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

I'm all over that!

Quote 
Or a more popular idea might be a tuning seminar - say Jamaica - where we all turn up the same fortnight and get shown to to tune a heli

When I was there back last April, I took Chris Kelly's Spectra-g for an afternoon and reworked the whole machine and radio programming while he was flying his jets. By the end of the afternoon, in his own words, that Spectra flew better than he's even seen it fly in the year he owned it!

Sometime in late November/December timeframe will be good for me!

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-15-2008 03:33 PM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

Now that would be a blast,,, Sounds like a fun time to be had by all.....XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-15-2008 03:40 PM
HOMEPAGE  
 
 
turbogti
Veteran
Location: St. Andrew, Jamaica

i'm More than ready to welcome you all here, I could also really do well with some tuning advice.
I could also talk to some people re: Special hotel rates.

Raj i think we should probably do this in Either Mo-bay or Ochi, in the day we use a football field or something and we tune from morning to about 5:00PM then after that we either hit the beach or the bar, preferably both!!!

This would truly be a great time. oh well...



****Predator Gasser SE - She's Ready to rumble ***
06-15-2008 04:28 PM
HOMEPAGE  
 
 
pgkevet
Senior Heliman
Location: surrey UK

..One of those weeks..

Waiting on parts to finish he Spectra with now..at least Preddie spares are here.

I need them badly.. my 600e's esc fried this am and my 450 exploded mid air on saturday (can't figure out which of the bits that rained down actually failed and some was lost in long grass).

Now I know why some folk have so many helis..

pgk
06-16-2008 02:31 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Hmmm

Quote 
my 450 exploded mid air

Trex 450's are not supposed to explode mid air! If it did maybe you're running to the rotors too fast or where was some build error. I've had mine for just about 2 years now and the only thing it does to me mid-air from time to time is snap the belt.... I'm glad my gassers are not belt drive due to that, at least you know the torque tube is going to stay together forever until YOU dork it, whereas the belt is just a mystery surprise that just ends up in an unscheduled repair

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-16-2008 03:31 PM
 
 
pgkevet
Senior Heliman
Location: surrey UK

Quote 
Trex 450's are not supposed to explode mid air! If it did maybe you're running to the rotors too fast or where was some build error.

I do know they are not supposed to explode!! And I've been flying it and fixing it long enough to know it wasn't any sort of build error.

Something gave way - fatigued, worn or whatever and not obvious on preflights and past repairs and maintenances.

pgk
06-16-2008 04:40 PM
 
 
Fixit
Key Veteran
Location: UK

Hey, we have a member that is fastidious about maintaining his mini titan but that also exploded in mid air without explanation so these things do happen.
06-16-2008 04:46 PM
HOMEPAGE  
 
 
j.8
Senior Heliman
Location: Denmark

Hi PGK

"Is this a valid solution? at the moment the ladders are still free.

Or is there another answer?"

A thing you might should look into, is the engien,
some zenoah engiens have small leftovers from the
production.
So that the " base " of the engien ( the part that mounts on the buttom plates on the heli ) are not straight, you can use a file
for that, obviously take where the file dust goes



Forget all about that shim stuff, make sure that the
engien " base " is level insted.

Regards Bo
06-16-2008 05:20 PM
 
 
pgkevet
Senior Heliman
Location: surrey UK

Quote 
Forget all about that shim stuff, make sure that the
engien " base " is level insted.

I was planning on grinding the base if necessary but not a job I wanted to do without making up a jig..

..In the end it all lined up as described and I still don't understand why.

I though this would be a relaxing hobby..

pgk
06-16-2008 07:19 PM
 
 
j.8
Senior Heliman
Location: Denmark

"I though this would be a relaxing hobby.. "

He he
06-17-2008 10:19 AM
 
 
7 pages [ <<    <     2      3     ( 4 )     5      6     NEXT    >> ]2891 viewsPOST REPLY
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Gasser Model RC Helicopters > Spectra Kit arrived
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