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Modefo's RC Helicopters . XHELI.COM . Autography FlightPower

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Gasser Model RC Helicopters > Align 600N gasser conversion
 
 
copperclad
Elite Veteran
Location: ..

hi Peter
just when i thought i was over my 600 fever , i am sitting here pining away for a stretch kit

i would add the extra 20 or more as you might want longer tail blades too ( 100 or 110mm ), you know that saying about it being easier to trim some away later , than adding some later , 680mm or 700mm is going to be a really nice setup i am thinking , cheers , dana
04-28-2008 05:19 PM
 
 
nivlek
Elite Veteran
Location: Norfolk England

Don't forget that you may need bigger tail blades as well .

At the end of the day , it gets dark .
04-28-2008 05:19 PM
 
 
Fixit
Key Veteran
Location: UK

Hi Dana

I thought you would go for the extra 20mm and it makes sense to have a bit spare to start with.

Dana & nivlek

I did ask about longer tail blades when I bought the boom and the reply was it should be fine with the 95s but in my own mind I thought it might need longer ones.

Peter
04-28-2008 05:28 PM
HOMEPAGE  
 
 
copperclad
Elite Veteran
Location: ..

hi Peter

i see the Predator NX comes stock with 95's on it , but i would be temped to leave some extra room still , dana

i suppose you would have to compare gearing to the tail to make a valid comparison between the two
04-28-2008 05:40 PM
 
 
victor55ca
Senior Heliman
Location: Vancouver BC

I think the Pred SE come with 105 mm tail blades.

Vince
04-28-2008 06:38 PM
 
 
Fixit
Key Veteran
Location: UK

600G Long Boom Version

Hi Dana, this is for you

Well I found a stretched 600 drive shaft in my workshop with two bearings that I made for a scale earlier last year so I cut the boom at 747mm to suit that the 600 is 625mm so that gives me loads to play with for longer tail blades and mains should it need them.

It also adds weight to the rear but I’m not sure if that is good or bad until I start adding the flight gear.

The synergy boom fits but the O/D is slightly bigger, it will fit the heli end no trouble but I had to file the tail rod rings on the inside before they would fit but once that’s done they are a snug fit without the need for glue or a wedge, the other thing I had to do was put two saw cuts in the tail end so the gear box would fit.

Peter

04-28-2008 10:00 PM
HOMEPAGE  
 
 
copperclad
Elite Veteran
Location: ..

hi Peter
it is looking great , the long boom will help the balance , and the metal blade grips are great , very cool , dana
04-28-2008 10:12 PM
 
 
Fixit
Key Veteran
Location: UK

Hi Dana
I thought you might like it

Did you know the ignition unit you used for the 20cc is no longer avaleble. I mailed them yesterday for shipping costs and they told me they no longer sell them.

Peter
04-28-2008 10:14 PM
HOMEPAGE  
 
 
victor55ca
Senior Heliman
Location: Vancouver BC

Hi Fixit

By putting the cuts in the boom at the gear box end you will concentrate stress. It would be better to not have to cut the boom. Watch it like a hawk for signs of cracking.

Vince
04-28-2008 10:24 PM
 
 
Fixit
Key Veteran
Location: UK

Hi Vince

That was the only way it would fit I can assure you, I'm wondering if people that have used the synergy boom on a 600 before have used the belt drive, the plastic tail box would give enough for the boom to fit.
Would a small hole at the end of the cut help, we used to do that at the end of a crack on machinery to stop it spreading
04-28-2008 10:41 PM
HOMEPAGE  
 
 
Invrted1
Veteran
Location: Cincinnati, Ohio

Quote 
Would a small hole at the end of the cut help, we used to do that at the end of a crack on machinery to stop it spreading

That does sound like a great way to lessen the chance of it cracking.

What will the ignition alternative be? The stock one is really tough on batts.
04-29-2008 02:43 AM
 
 
Fixit
Key Veteran
Location: UK

Quote 
What will the ignition alternative be? The stock one is really tough on batts.

That’s the only thing that bothers me about this gasser, it wouldn’t be so bad if you could use a battery bigger than 2500, maybe someone will come up with an alternative when more builds get underway.
04-29-2008 03:59 AM
HOMEPAGE  
 
 
ozace
Key Veteran
Location: melbourne, australia

The 20cc Zen i have in a heli uses a 3000mah emoli cell for the stock ignition. It uses about 400-500mah for 20mins of flight from memory. 3 flights is all i can manage in one day so i have no problems with it.

we can never have too many, can we ?
04-29-2008 04:06 AM
 
 
Fixit
Key Veteran
Location: UK

Quote 
The 20cc Zen i have in a heli uses a 3000mah emoli cell

This is from the 20cc manual and it doesn’t mention 3000mah emoli

Ignition Battery
The ideal battery is a single 3,7 V LiPo cell of 2000 to 2,500 mAh capacity. E.g. our ZG-I 2450
Li-Polymer Ignition Battery, order no. #2025. It only weighs 54 grams including the connector
and supplies energy for one and a half hours flying. If you still think the LiPo's are
too dangerous, then you can use 3 (three not four!) cell NiMH with about 2,000 mAh.
The ignition module is designed to work at up to 20.000 RPM for use on the marine version
of the ZG 20. For this, the battery has to be a 4 cell NiCd or NIMH. Used in model aeroplanes,
the ignition performs perfectly and without a stutter down to 3.1 Volt, as we need only
a maximum of 12,000 RPM. The lower voltage reduces the otherwise very high power
consumption to a reasonable level and the ignition module temperature will be lower.
04-29-2008 04:21 AM
HOMEPAGE  
 
 
Fixit
Key Veteran
Location: UK

Hi Dana, is this the same system you used?
http://www.ch-ignitions.com/exl.html
04-29-2008 04:58 AM
HOMEPAGE  
 
 
ozace
Key Veteran
Location: melbourne, australia

Fix, the mah is not a concern to the IE module only the voltage.
The emoli cell i use is 4ish volts (like a lipo cell) at 70 grams but is hard shelled so it is robust (unlike a lipo sac).

we can never have too many, can we ?
04-29-2008 05:13 AM
 
 
nivlek
Elite Veteran
Location: Norfolk England

You could try one of these :

http://www.unitedhobbies.com/UNITED...?idProduct=6292

I got one a week or so back along with the sensor from the same site, I've tried it out on a Petrol engine that I have in a fixed wing model on a four cell nimh pack , it works fine . The unit and sensor weighs 103 grams (including plug lead and shielded cap) .
The best thing is that is cost me just £20.01 including delivery .

At the end of the day , it gets dark .
04-29-2008 07:19 AM
 
 
copperclad
Elite Veteran
Location: ..

hi Peter

i am running one of these in the heli now
http://www.copperheadaviation.com/c...?idCategory=156 , you see they have 10mm and 14mm , for the G-20 you want 10mm

and i have a BMCA unit

and yes , i think the unit from CH is the same

i think the unit nivlek has would be a good choice also , but i am not sure if it has timming advance or not

i have the suspicion that these are comming out if China and are rebadged for different sellers , the copperhead and BMCA units looked identical except for the label

i have hooked a few up to a current meter and found that the stock Zenoah unit draws low current at low speeds but as the RPM climbs the current draw climbs also , with the engine running at full the current draw was over 2.5 amps

the BMCA unit was drawing about 500ma ( 0.5 amps ) at full speed , and i have heard this same result from other users also , here is a new link for BMCA
http://bcmaengines.com/Ignitions.htm

here is the same unit rebadged , i just googled " CDI ignition unit " for this link
http://www.prcmodel.com/modeng/name...tore/category/7
and if you look at this link you will see there are fixed timming and timming advance units , you want the units that advance the timming , they are easy start and have a better top end


RC universe has an engine forum that covers a lot of what is going on with these CDI units
http://www.rcuniverse.com/forum/forumid_92/tt.htm


here are a few more links
http://www.southeastrcengines.com/
http://www.ch-ignitions.com/
http://rcignitions.com/

HTH , dana
04-29-2008 12:07 PM
 
 
Fixit
Key Veteran
Location: UK

Hi Dana, I will have a look at these later as I'm busy right now fitting the fan and pinion that turned up on my doorstep first thing

Dana, before I fit the shroud do I need to open up the top hole?

Peter
04-29-2008 02:37 PM
HOMEPAGE  
 
 
copperclad
Elite Veteran
Location: ..

hi Peter
hey! , that Scottish airmail isn't so bad after all

yes , the shroud needs to be opened up to just over the fans topring opening , i just used a dremel cutoff and sanding drum , be sure to mount the fan and shoud so you are sure it all centers , and then mark for the cutout , dana
04-29-2008 02:55 PM
 
 
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Gasser Model RC Helicopters > Align 600N gasser conversion
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