Engine Orientation...

[Aquillaguy]

.... Installed my motor facing forward so I can see my fuel tank easily read a lot about rather facing motor to rear because of CG...

I strapped powerpack to back of Rear upright mainframe bracket ...

Had plenty of space up front for comfortable Rx placement...

Bird flies handsfree no running away with minimal trim so I take it CG is pretty much where it should be...
:glasses:

[bigrcr]

Excellent!!!! Keep us informed of your progess with the machine!

Later,

[Aquillaguy]

Spent whole afternoon flying alternating between my Raptor 50 and the Spec G.Am still running her in... I followed the posted burn in link and tried to understand it as best I could.... Am running in Mineral 2 Stroke at 40:1 ,10 minutes at a time.Then cool to cold before next burn...

Just as an experiment I started with suggested both needles 1.5 turns out from closed to begin with,now I am making the highspeed needle richer 1/8turn every other tank ..... no harm in this is there...how do I know when it's rich enough or in fact too rich... TH/Crve is super low as recommended in posting...?????
Am just very cautious with new motors will rather have more oil than less for burn in.....

Any thoughts will be appreciated.... Mine being I believe the first SpecG on African continent that's already flying.... so not a huge amount of knowledge on this ship available here... :shock:

Many Thanks

Aquillaguy

[bigrcr]

Sounds like you are on the right track! There is no harm in keeping the motor rich with the oil ratio you are using. You will know when it is too rich when it does not take throttle well anymore and the performance is lousy. The tail will kick pretty bad with throttle as well. Then back the needles in until the performance picks up again, but for now keep it as rich as you can stand it.

The heat cycling you are doing is very important. You are probably noticing more power with each subsequent flight, hence the richening of the top end.

Once you get a few tanks through the model, start to demand a little more of each each flight. This is important as well as this helps to break everything in nicely. Just make sure to cool the motor with a bit of forward flight without load following the application of load to the motor.

Too lean a mixture will cause the motor to pick up RPM without cause, make the tail shake (and possibly the skids) and you may pick up the sound of a rattling boom support or a egg-frying sound. This will be the sign that it is too lean and is actually detonation caused from heat, advancing the timing.

Your caution with break in is well warranted as this will nearly ensure a good running motor in the long run--patience is a virtue for sure.

After 1 gallon, switch to Amsoil at 50:1 or another good quality synthetic, just check to make sure of the best ratio for what you are using. You can ask here about that and I will do my best to get you the proper information on the oil you choose.

Good luck, it seems you are well on your way to a happy motor and a lot of fun!

Hope this helps!!


Later!

[r/c_outlaw]

I am hearing Amsoil combination 50/1 Sean a post that one was using a :?: ozark trails camping fuel with amsoil 100/1......will 93 octain not give it enough performance with klots 50/1......any feedback on a good fuel combo for the toxic modifed 231 would be great...

[bigrcr]

The best fuel for the TRM motor recommended by TRM is Amsoil 100:1 Saber Professional Pre-mix mixed at 50:1 with Coleman or Ozark fuel. I do not recommend 93 octane fuel as the motor will not run on it as well as it will regular pump gas or the camper fuel. The 93 octane rated fuel burns slower than the other mentioned fuels.
Klotz with Technoplate that is formulated for gasoline is another very good choice at 32:1 mix ratio down to 40:1 (no leaner on oil).

Break-in should be done with a good petroleum (mineral) based oil as it will allow break-in more quickly while providing adequate lubrication. Mix this at 28.5:1 ratio to 32:1 (no leaner).

Hope this helps!!

[Aquillaguy]

I have not trimmed my canopy yet,have currently got motor sitting forward,I want the optimium engine placement.So would rather change to back if this is the more suited position.

Can she sit in the hover without backward trim in the motor/rear config.??

Essentially ..... which is best front or back???

Thanks gents..


Aquillaguy

[carey shurley]

Engine position is optional, it will work fine in either direction.

Depending on what radio gear and battery you use, the model will CG about on the mainshaft with the engine backwards. As the fuel burns off, the CG will move rearward slightly.

With the engine forward, it will CG slightly forward of the mainshaft. This will result in better FFF and will improve loops and rolls. There will be less CG change as the fuel burns off.

As far as which is "better", I think its personal preference as to how you like the model to fly.

[Aquillaguy]

Carey

OK with both ways being workable,which is the most popular and for what reasons?

Thanks

[carey shurley]

I think a lot of people are mounting them facing rearward, because thats what they are most comfortable with. To my knowledge, the spectra is the only commercial model that allows the engine to be mounted forward. Kyosho had a prototype last year that supported this but I'm not aware that it ever went into production (maybe in Japan).

I like mounting it forward because:
you can mount the fuel tank in the back where its visible
my models are more nose heavy because they hold FFF, loop and roll with less input from me, so this accomplishes that without adding any weight
it centers the muffler more on the chassis