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01-22-2010 06:08 PM  8 years agoPost 1
CT.Chopper

rrVeteran

Meriden, CT

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Hi,
Has anyone played with the forward facing engine mounting?
I like the idea of the fuel tank being closer to the main shaft but am wondering if it will be too nose-heavy with the forward facing motor.

I will be running a G-26,Hatori muff, JR-DS-8311s 4000mah li-po GV-1 and stator gator.

I would like to hear from those of you that have tried both locations,
and the good/bad points that you have found...

Thanks!
Rob

P.S
I have tried to search for answers but came up with nothing..

Rob Landry.

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01-22-2010 06:18 PM  8 years agoPost 2
Sean Bosse

rrApprentice

Germantown, MD.

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Check here: https://rc.runryder.com/t565040p1/ On the bottom of the second page Carey Shurley gives a nice explination as to the advantages/disadvantages in the engine placement.

Hope this helps,
Sean

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01-23-2010 12:43 AM  8 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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Rear
I personally prefer rear mounting as I think its more ideal because:

#1 less cutting of canopy, almost none actually.
#2 easy access to spark plug in rear
#3 keeps engine ignition further away from radio gear, though this is probably not an issue really these days.
#4 CG comes out perfect this way

If you put it the other way:

#1 fuel tank is visible

Hope this helps,

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3300 flts
Whiplash V1-2 Hanson 300, 1590 flts
Whiplash V2 Hanson 300, 437 flts

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01-23-2010 01:08 AM  8 years agoPost 4
CT.Chopper

rrVeteran

Meriden, CT

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Thanks guys,

I think i may put it in the front,

Raja,

does it hack up the canopy a lot or just needs to be trimmed a bit?
also,
I will be running the 3-D max with the stock pinion and a 90t main gear
would you have the part number for the gear handy,and the servo support Part # for JR servos?
if it's not to much trouble...

Rob Landry.

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01-23-2010 01:52 AM  8 years agoPost 5
rbort

rrProfessor

Franklin, MA - USA

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Trim
You'll need to trim it both for the exhaust side as well as the carb side unfortunately

The 90 tooth main is 0865-90. Usually the Spectra you use 0865-92 which is a 92 tooth. You'll probably have to slot the holes in the side frames to set the gear mesh if you use a 90 tooth main.

Sorry don't know the JR servo support part number off the top of my head...

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3300 flts
Whiplash V1-2 Hanson 300, 1590 flts
Whiplash V2 Hanson 300, 437 flts

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01-23-2010 02:42 AM  8 years agoPost 6
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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go this link:

http://www.miniatureaircraftusa.com...d%20Rev%205.pdf

look on the last few pages, there are full size cutout maps for your canopy.

cut them out, tape them to your canopy, mark the cutouts and then cut them out.

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01-23-2010 09:41 PM  8 years agoPost 7
CT.Chopper

rrVeteran

Meriden, CT

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Thanks for the replies!!

Raja,
do you think it's better to use a 90t main or a 14t pinion?

Rob Landry.

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01-23-2010 10:45 PM  8 years agoPost 8
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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Rearward facing for me. During breakin I pull the plug on every flight to check for to lean run.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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01-23-2010 11:43 PM  8 years agoPost 9
ddavison

rrVeteran

Brownsville, Pennsylvania

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Engine front for me. I am using the Hatori and with the inlet closer to the front it would hang back too much for me ,it now tucks right along side. Fuel tank in rear easy to see. Stay slightly nose heavy no matter how much fuel, tracks nice. just a slight amount of trimming on canopy needed.

DaveDavison,GasGob,WhiplashGas,Spectra,JRXG11MV,12X

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01-24-2010 12:03 AM  8 years agoPost 10
CT.Chopper

rrVeteran

Meriden, CT

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ddavidson,
it appears the tank is close enough to the main shaft that
through the tank cg will not be effected much..
am I right in that assumption.?

Rob Landry.

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01-24-2010 12:13 AM  8 years agoPost 11
Justin Stuart (RIP)

rrMaster

Plano, Texas

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do you think it's better to use a 90t main or a 14t pinion?
First of all, while getting a 90T main gear is as easy as ordering it from one of the many MA retailers, getting a 14T pinion is not nearly as easy. I had to wait many months for mine to be custom made. Now I'm waiting even longer to get the plates to fit it. But here is the deal:

If you go with a 13T pinion/ 90T main gear, you'll be sliding the clutch towards the main shaft. If you go with a 14T pinion /92T main gear, you'll be sliding the clutch away from the main shaft. If you have a generator, there is not really enough room between the AR bracket and the generator motor to allow for the use of a 90T main gear (without a lot of modification), so your only option if your flying a generator and want a much lower gear ratio is to go with a 14T pinion.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-24-2010 01:03 AM  8 years agoPost 12
CT.Chopper

rrVeteran

Meriden, CT

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cool,
thanks!

Rob Landry.

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01-24-2010 02:26 AM  8 years agoPost 13
ddavison

rrVeteran

Brownsville, Pennsylvania

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That is correct the tank is real close to the mainshaft, when mounted in the rear, closer than when it is up front so as the fuel empties this is very little cg shift and what little there is it shifts toward the nose.

DaveDavison,GasGob,WhiplashGas,Spectra,JRXG11MV,12X

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01-24-2010 01:09 PM  8 years agoPost 14
CT.Chopper

rrVeteran

Meriden, CT

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Sweet!
my kit got here last night and it has the stratus open tailbox and a 92t main gear,

now...do you guys think i should put in a 90t or just leave it 92t?
i have no problem putting in the 90t but dunno if it's worth it..

V-Blade 690s
Hanson 3-D max
Hatori muffler

Rob Landry.

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01-24-2010 02:22 PM  8 years agoPost 15
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Why do you want a 90T main gear? Are you running a 27cc engine and need to keep the RPMs down? Are you at high altitute and need to get a higher headspeed? Because otherwise you should just stick with what the heli was designed for. Many people are running Hanson 3DMax engines with the 92T/13T combo and are happy with 1750+ headspeed and 12,500 engine RPM. I lowered my gear ratio because I am using an experimental 27cc engine that is not supposed to go above 12,000rpm. Without my lower gear ratio, I wouldn't be able to achieve a very fast head speed. As I said before, if you go with the 90T main gear you're going to have problems if you choose to install a generator. The 90T main gear is smaller diameter than the 92T main gear.

If I were you, I would just stick with the stock gear that comes in your kit. You can always change it later.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-24-2010 08:46 PM  8 years agoPost 16
CT.Chopper

rrVeteran

Meriden, CT

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I was under the assumption that for the 26cc engine a lower gear ratio would be better..

Rob Landry.

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