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Ace Hobby . Esprit Model . Thunder Power RC

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Gasser Model RC Helicopters > Spectra Kit arrived
 
 
j.8
Senior Heliman
Location: Denmark

"The TRM 231 is definately a good motor too and the Spectra was designed around that motor with the GR optimized for it at 7.15. MAX head speed by design was meant to be 1800 rpms"

Well actually the TRM 231 S1 has it`powerband between 12750-13250 rpm
that gives a headspeed like 1783-1853.
Perhaps the design of the rotorhead was meant to be MAX 1800 ?
Anyway at those headspeed` you will need alot of power for
the servo`, and the best thing on the marked, in my opinion,
is Raja`s jewel generator, high speed/power servos like
8717 and others, will drain your battery in no time, I have
had a bad crash due to low batt, and now I use the Jewel generator.

Regards Bo
06-20-2008 05:09 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

J8

Do you use JR 8717 servos in your heli? A fellow was asking me concerned that they are too power hungry...

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-20-2008 07:13 PM
 
 
xcellgasman101
Elite Veteran
Location: WOODWARD, OKLA....

JR 8311 all the way,, well except for the JR 4721 that I have in some of my 1005 SE gassers.. But you can't get them any more,, XGM/VGM

John Crotts
www.soonerhelicamproductions.com
06-20-2008 07:17 PM
HOMEPAGE  
 
 
j.8
Senior Heliman
Location: Denmark

Hi Raja

Well my radio gear is from Graupner in Germany, they
get there servos from JR, and Graupner then gives the servos
new " names " the servo I use on the swash are 8922, they
have the same red aluminium housing as the JR 8717, and
same power and speed, and they are hungry, I run them with your
generator with out any problems, and I have the G770T gyro
with a 8900 tail servo wich allso need some juice, I would
say a hungry setup, but every time I land my bat indicator
tells me that the battery is full , I am not pulling anybody`
nose around her, that generator is really good, infact
I will not fly a gasser without that generator.

Regards Bo
06-20-2008 07:40 PM
 
 
j.8
Senior Heliman
Location: Denmark

Another thing, when I bought the Jewel generator from
you, you asked if I needed that voltwach, that shows
the low "peak" during load, and stores it, I sad no,
but got one like it, later on from Graupner, and during
load I have only had a "two diodes down low peak" with
the above setup, if you know what I mean, so I think
that the generator provides plenty of power

Bo
06-20-2008 08:01 PM
 
 
Excalibur
Veteran
Location: Destination: Earth

Quote 
that generator is really good, infact
I will not fly a gasser without that generator.

I absolutely agree with this assessment. I have had the Jewel G
generator save me several times over. The cost of the generator is nothing compared to the warm fuzzy feeling it gives you knowing your protected from typical electrical failures.

The first time you land and shut the heli off, then realize that your batteries or switch crapped-out, you will never fly without one again.

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore
06-21-2008 06:24 AM
 
 
Fixit
Key Veteran
Location: UK

I also use the onboard generator but some people might not know what we are talking about because the link to Raja’s homepage isn’t there anymore, have I missed something?
06-21-2008 09:37 AM
HOMEPAGE  
 
 
j.8
Senior Heliman
Location: Denmark

Here is the link to Raja` jewel generator
http://mysite.verizon.net/vze49gsg/

Bo
06-21-2008 10:06 AM
 
 
Eleven_Bravo
Senior Heliman
Location: Modesto,CA

8717's huh ???? You have no problem with the Jewel keeping things charged ???? I understand how they rebrand the JR servo numbers. The first time I seen 8717's was on Nigel Browns heli at a FF they were 8915's on his heli. He was telling us how they were going to be called the 8717's in the states. I have been curious if the generator will keep them supplied with juice. I guess it will.

Quote 
infact
I will not fly a gasser without that generator.

That is a pretty bold statement that was agreed with further down in the post. Do you guys really feel that strongly about Raja's Jewel??

Quote 
realize that your batteries or switch crapped-out

I have had both of these on separate occasions cause me crashes. I have had a hard decision on wether to run a Arizona and the 5200mah relion or the Jewel. Its hard for me to leave the proven Arizona as I have had 0 issues since switching to it and doing away with 4.8v The arizona does away with the small batt connectors and replaces them with Deans then it has two battery leads providing 6v that goes where your gyro and remote gain plugs into the RX. The gyro plugs into the Arizona itself and gets 5.0v Fromeco uses top quality LI-ION cells but that doesn't stop the battery from failing true they are alot less likely than most of the cheap 4.8v packs out there but it could still fail. If a batt did fail with the Jewel I would still have it providing juice.

I think I have just answered my own question and my whole purpose was to ask you guys if you really liked the generator that much. I love the dual power supplied to the RX by the arizona but in the end it is still just one battery powering it all. With the Jewel you have a batt and the generator suppling power to the RX if either one fails your still in the air.

Like I said I answered my own question about which to use it will still be a few months before I get my $$ right and start ordering everything I need so Raja expect a call from me then.

Its not a maneuver until your looking down on it. ~Jason Krause~ Phoenix FF 08
06-22-2008 11:46 AM
 
 
Fixit
Key Veteran
Location: UK

You have come to the right conclusion in my opinion and wont regret ordering one when you do.
06-22-2008 12:06 PM
HOMEPAGE  
 
 
pgkevet
Veteran
Location: surrey UK

I'm not saying a generator isn't the right answer (If I ever get my birds flying and become competent I'm sure I'll be queuing) but if failures are your reasoning .. then anything can fail.

You could just dup the power supply and regulators anyway.

The real benefit to a jenny is not having to swap/charge flight packs - perhaps a really class act would be a flight or two with a spare tx pack and charge that

pgk
06-22-2008 01:42 PM
 
 
Fixit
Key Veteran
Location: UK

Quote 
but if failures are your reasoning .. then anything can fail.

Your right anything can fail but the generator has a led that lets you know if it’s stopped working and if it does you still have control, the best bit for me is not having to charge in-between flights. This generator must be well maid because mine has been from box to heli four times and I've never had a bad connection or failure so far in the time I've abused it
The other benefit is you can cut down on the battery size but I chose to keep a 4200 so if I don’t notice the led first off I still have a good few flights left.
06-22-2008 02:13 PM
HOMEPAGE  
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

I went back and forth on the Generator, and after having my Predator rekit itself due to the battery getting loose and causing hundreds of dollars in damage, I picked one up for the Spectra I'm building. I'll tell you, it's a very nice unit, and the mount for it is actually made by MA for the Spectra. I just want the redundancy, and I'm putting 8717s in this heli, so the extra power will be most appreciated.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
06-22-2008 02:16 PM
 
 
pgkevet
Veteran
Location: surrey UK

Build Thread - current

I'm still pending parts but it was way windy here today so I installed the servos.. I'd sorat been waiitng for rx etc to do it in one hit.. but had to do something heli today after catching up paperwork.

So comments: Finalised rudder pushrod..I'd followed & measured items exactly but found the tail link thread too long.. had to cut it back, had just enough thead left to avoid the need to buy a die and add thread. Perhaps epoxy'ing a bushing into the rod instead of a threaded rod would be more adjustable?? But a warning to size it up better than i obviously did!

My Futaba servos go in nicely. I used servo straps and the supplied bolts were still long enough. I don't care for the throttle servo mount..one corner of the carbon is floating and there has to be movement and vibration potentials. Obviously it works.

I also didn't like the idea of stacked plastic spacers - it works but perhaps some upstand from the baseplate instead? Those spacers were a nuisance.. the holes need redrilling (so much for legendary fit) and late sunday when you discover the 2.5mm drill bit was borrowed and broken.. I used a dianond bur..

My only other comments on this section..It hadn't 'clicked' before that this bird uses single rods on each servo wheel. For a heli this size I'd sort of assumed they would be push-pull rod pairs to bellcranks - that gives some redundancy and security. I also noticed (now) that the links to the side balls on the swash will not be vertical at mid-pitch with the bell crank. I assume that has to add a ccpm interaction?

Or you could argue that there's only ever one link up to the swash - so what the hey!

All the servo wires hide inside the frame tidily.

This arrangement looks lighter and neater overall than preddie..or you could argue Preddie looks more substantial..but then it looks heavier overall too. I'm not assigning points here,, because I don't know how to for this section. When i do have the rx I'll score according to how well it all lines up

pgk
06-22-2008 11:40 PM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Link question

Quote 
the link to Raja’s homepage isn’t there anymore, have I missed something?

Sorry Fixit, I was asked to remove my homepage link a couple of months ago.

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
06-23-2008 02:56 AM
 
 
Excalibur
Veteran
Location: Destination: Earth

Quote 
Do you guys really feel that strongly about Raja's Jewel??

Absolutely! On the last situation, I was running dual batteries with dual switches, and the jewel hard-wired into the receiver directly (no switch). When I landed and shut off the engine, there was no response on any of the servos at all. I then discovered that one of the switches had failed outright, and vibration had caused a wire to come loose in the other one. This could have resulted in one hell of an expensive crash. Instead, it was a non-issue because the generator just kept happily providing power to the system while the engine was running.

Quote 
The real benefit to a jenny is not having to swap/charge flight packs

I used to think that was the primary reason, but as stated above, it really is there to save your wallet, your heli, and your safety. Not having to charge in between flights is just a nice bonus.

PUT A GENERATOR ON YOUR GASSER ALWAYS! It just can't be overstated.

Ok, I'll get off my soapbox now.

Xcal

Camper Fuel: It's Not Just for Breakfast Anymore
06-23-2008 05:40 AM
 
 
Eleven_Bravo
Senior Heliman
Location: Modesto,CA

Thanks guys for answering my questions.

pgkevet, sorry about the thread hijack please continue on with your build review. I will be building a Spectra-G in a few months and want as much info as I can gather so I am prepared to get it right the first time.

Its not a maneuver until your looking down on it. ~Jason Krause~ Phoenix FF 08
06-23-2008 12:46 PM
 
 
Fixit
Key Veteran
Location: UK

Quote 
Sorry Fixit, I was asked to remove my homepage link a couple of months ago.

That’s a bummer, I’m sure the link will keep popping up on this forum
Is it still http://mysite.verizon.net/vze49gsg/
06-23-2008 09:27 PM
HOMEPAGE  
 
 
pgkevet
Veteran
Location: surrey UK

Raja et Al - Build thread - Options

OK Guys, Finally got my Du-bro tank. Too bushed to do anything tonight (long day) but started to think about fuel outlet position...

The suggested top holes are obvious, convenient and could be anywhere on top anyway. But the fuel outlet, clunk line..

If I understand theory suggests should be midway on the bottle for consistent pressure? I don't quite figure that 'cos the clunks gonna clunk about anyway? Raja has his next to the stopper according to pics - but that's not halfway up... and I can't see an ideal position with this bottle shape.

If you were making up a new bottle would you put it elsewhere?

pgk
06-23-2008 11:03 PM
 
 
Fixit
Key Veteran
Location: UK

No tank pressure on a gasser it’s pumped.
I would go with Raja on this one, I did and I guess lots more have.
06-23-2008 11:23 PM
HOMEPAGE  
 
 
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Mikado Modellhubschrauber . GrandRC . CanoMod

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Gasser Model RC Helicopters > Spectra Kit arrived
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