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HelicopterThunder TigerOther › Some questions B4 the 90 Conversion(C-Spec?)
09-06-2003 10:44 PM  14 years agoPost 1
spurry

rrVeteran

Reading, UK

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As you might of read, I crashed the raptor 60 a couple of weeks ago and it was pretty bad, but it's an unexpected upgrade opportunity right!

While I'm rebuilding I thought I'd convert to a 90 now, but I have a few questions that seem to be popular, but even though doing many searches I still all the info I need.

1./ Do any metal fans fit the C-Spec? Quick UK, which one?

2./ Can I fit a C-Spec in with only minimal body trimming on the V2?

3./ Will the Viperhead fit better than the stock one? If so, could you please pop me the website/prices.

4./ What pipe/muffler would you recommend for the c-spec?

5./ Are the C-Specs so much better than the TT's in a rappy?

6./ Do many use the Webra 91 P5AAR motor? Clocks in at 3.6bhp whereas I believe the C-Spec is only 3?

Sorry to ask all the questions but I'd rather do this than learn the hard way.

I was planning on buying the 60-90 conversion kit, do you think it would be worth it being 'heliless' until they're released or just convert, fly it and wait for the new+improved SEV2 to come out.

Things I have already or will get for the new bird are: MA 3D paddles, Rick's O-Ring upgrade,NHP fins, QUK swash/washout base/collar/headblock , 3D clutch and bell,carbon mains+tails (700+105's???) possibly the carbon frames, MPII (depending on the replies) and anything else I think off.

Thanks for the help

James

PS: and a perry-pump.

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09-06-2003 10:48 PM  14 years agoPost 2
spurry

rrVeteran

Reading, UK

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Here's some great pics that compare the heads, many thanks to Payton:


I wonder if Alan Szabo's new SoCal video had anything to do with me changing my mind from a little 50 to a beast of a 90.

cheers, james

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09-06-2003 11:40 PM  14 years agoPost 3
Raptorite

rrApprentice

Wiltshire, UK

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Hi James,

I hope you got the Ricks O ring upgrade package ok today.

I have both a Rappy 60 and a Rappy 90 so here are my thoughts and answers to your questions;

1. The Quick UK fan will fit the C spec as the crank is the same from the 61 right up to the C spec. Also the Quick fans have the recesses already machined in for a set of GV1 magnets, you're going to need one of those if you havent already got one.

2. The only trimming necessary to fit the C spec into the Rappy is to releave the fan shroud at the front where it covers part of the head, this will not affect the cooling any as there is plenty of air being blown around inside the canopy, If you are worried about this however, you might want to cut the hole beneath the nose of the canopy directli in front of the engine, the edges have been highlighted for this reason.

3. If you use the C spec engine there is no need to change the head as the stock one is fine.

4. Without a doubt the best pipe combo I have seen on a C spec is the MP2, it is plug and play, has loads of power is not big, bulky or heavy and sounds great. Although having said all of that I have the older OS 91 SXH in my rappy 90 with a Zimmerman 90 size quiet pipe which I also like very much.

5. I would choose the OS route simply because of the OS renouned reliability, although having said that there is a lot of info on here about lack of reliability in OS engines, mostly relating to bearings. I has to be one of if not the best 90 size motor availabe and is very popular for that reason.

I built my Rappy 90 using a stock V2 kit and the 90 upgrade kit, one piece of advice I will give you on that is to toss the pinion gear provided in the upgrade kit and go for the 12 tooth one instead, this will give a main rotor ratio of 7.75 to 1 which is about perfect for the os 91 at a headspeed of 1800. Dont worry if the meshing is a bit tight to start with using the larger pinion, it will bed in nicely after a few flights.

I hope this helps.

Peter.

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09-07-2003 12:06 AM  14 years agoPost 4
spurry

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Reading, UK

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Hey Up Peter, thanks for the Rick's O-Ring set, arrived a couple of days ago and I've been meaning to email you but I've been swamped by all my raptor 90 research!

That helped alot! These things are just going over and over in my mind, but finally everything is getting clearer. Your answers were great, just the ones I was looking for as well!

I've got the QUK OS61/70 fan so I'm happy that I can use that, and I have it setup with Hotwings optical sensor for the gov. A MPII will be added to my list as it's my fav too! I added question 6 whilst you were replying, but your answer to 5./ fits that one fine. Is the reason why you say ditch the 11T pinion to get the better gearing? This is my first time doing a conversion so the gearing is new to me as well.

Thanks again for the info, I'll sleep tonight! Any more tips on the raptor90/engine will be greatly appreciated, I might even get two nights sleep if you keep 'em comin'!

James

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09-07-2003 03:57 AM  14 years agoPost 5
TerranAce007

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Austin, TX

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What the ???

Two glow plugs? Do they both fire during run, or is one backup? Is that the Viperhead?

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09-07-2003 10:20 AM  14 years agoPost 6
G.Man

rrProfessor

Bristol

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they both fire but only one is used to start the engine

Don't Email me as I wont reply - PM Only (spam countermeasures)

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09-07-2003 10:28 AM  14 years agoPost 7
spurry

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Reading, UK

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Yes it's the VIPERHEAD , but you can get the single glow plug model as well. It looks to be a little wider but not as long which is why I thought it would fit better. But sounds like the standard shouldn't be much hassle anyway so I'll try that.

Does anyone know the cheapest source right now for the carbon frames, and/or the base plate?
Galifrey, has Dokey got your rappy now? What engine did you use?

James

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09-07-2003 10:30 AM  14 years agoPost 8
DOKEY

rrProfessor

Northamptonshire UK

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Yup Dokey got his old Rappy back

Did have the OS91 init, but is now being fitted out with the YS 91 !!


Ryan.

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09-07-2003 10:39 AM  14 years agoPost 9
spurry

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Reading, UK

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Did that fit in good Dokey, and which do you prefer? Err..I think I'll forget the Viperhead for now until I have $120+ to spare. I never realised they were so much. Here's some of it's specs:
Dual Glow plug version:-
Increases power
Much Better Cooling
Improves combustion
Smaller size - easier installation
Improves sound
Better Idle. Eliminates dead engine autos
(it doesn't make fuel though)

Single Glow plug version:-
Much Better Cooling
Improves combustion
Smaller size - easier installation

Any more questions I get, I'll post here. There's bound to be a few more things that will get me thinkin!

James

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09-07-2003 10:40 AM  14 years agoPost 10
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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James, the TT carbon frames fit perfectly. Some of the after market carbon frames need attitude adjusting in some areas. I went for the TT's .

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09-07-2003 10:52 AM  14 years agoPost 11
DOKEY

rrProfessor

Northamptonshire UK

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Havent actualy put the YS in it yet, although its all sitting there with fan etc on

Have run both the C Spec and YS in the Fury and out of the 2 I would deffinatley go for the YS91, its much smoother and has a much more consitant run with out any mods. Oh and seems to have more power !!

If your after carbon frames go for the NHPs, quality was outstanding, and aligned up perfect.

I see Motors and rotors are advertising the Viper head for both OS and YS, price £95 !!

Ryan.

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09-07-2003 08:07 PM  14 years agoPost 12
spurry

rrVeteran

Reading, UK

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Get that YS in there Dokey!

Ok, I think it will be the YS91St +MPII that I go for looking at my other thread. Not sure what carbon frames as yet, depends what make are available at the same place.

I'm going to have quite a few more Q's over the next couple of days cos the rappy is getting totally stripped down and things are changing by the day.

Thanks for the info, any more just jot it down as it may be a while before I have everything together ready to fly.

James

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09-07-2003 11:09 PM  14 years agoPost 13
spurry

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Reading, UK

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Here's one: Everyone says replace the clutch because the huge amount of power of the 90's will break them almost instantly, are you talking about the stock 60 ones, or the ones supplies with the 90 conversion kit which is a heavy duty clutch and bell? More to come

James

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09-09-2003 12:08 AM  14 years agoPost 14
Raptorite

rrApprentice

Wiltshire, UK

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Hi James,

Im glad you got the O rings OK and that I can be some help to you.

The reason why I suggested ditching the 11 tooth pinion in favior of the 12 tooth one is that when I flew mine with the 11 tooth pinion to achieve the 1800 headspeed that the raptor is happiest with meant that the engine was reving that much higher, this ultimately caused not only a whole bunch of unwanted vibrations but also meant that the engine was reving too high for the size of motor, swapping to the 12 tooth pinion meant that the engine was running at 13950rpm at 1800 on the head instead of 15210rpm which the engine ran at with the 11 tooth pinion.

The specs for the OS 91 (and prety much every other 91) say that the optimal speed for the motor is around 14000rpm, therefore the 12 tooth pinion will get you to near as damn it optimal engine speed with a headspeed that the heli is happy with which will also reduce the potential for vibration thus making the heli more stable and alot smoother.

With regards to the clutch, the one that gives up easily is the standard 60 one, you must put the 90 size (also known as the heavy duty 3d) clutch and bell in to cope with the extra torque that is produced by the 91 motor.

Cheers,

Peter.

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09-09-2003 12:31 AM  14 years agoPost 15
spurry

rrVeteran

Reading, UK

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Thank you ever so much Peter for another great reply. I have a gigantic shopping list for this new raptor 90. A 12 T pinion is one of the items.

Thanks for the gearing and clutch info. I was a bit worried about having to replace both the pinion,clutch and bell out of the conversion kit thinking it may be cheaper to just buy them individually but you've cleared it up for me.

I posted a thread on the 'Best' 91 Engine and due to an overwhelming response for the YS, that's the route I'm taking. I've done alot of reading on it and they sound great.

I have stripped the rappy down now and am cleaning it all up. It's going to be an expensive conversion when I add it all up. But probably would of been alot more if it wasn't a good ole rappy!

I'm going to dremel out the dampener cups of the Rick's upgrade set tomorrow as recommended here. And I'll go for the carbon frames from Quick UK. I get my Quick UK gear from my fuel supplier so he's going to have a field day when he hears that not only will I be buying about £300 worth of QUK metal from him, but I'll be now be fuelling a 90!


Thanks to everyone for now, as always, I'll be back. If not with Q's with some lovely pics of a shiny R90V2/YS91st. p)

James

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HelicopterThunder TigerOther › Some questions B4 the 90 Conversion(C-Spec?)
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