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78'' Extra

cwojcik

cwojcik

70cc twin V2
I have found that gassers always fly and feel faster in the air. This is because as you unload an electric motor as the plane picks up speed, the motor makes less and less torque (until it hits the KV*voltage value). An electric plane will hit an invisible wall trying gain more and more speed with a low-pitched prop. A gas motor, however, continues making torque as the RPM picks up. So with a lower pitched prop, the gas motor will pull harder at speed.

If you go to an ES pipe your CG likely won't change much. The header will weigh about the same as the muffler and the pipe is roughly distributed along the CG. You will get more power and be much quieter, though.
 
hone

hone

150cc
Thanks for the explanation on that! I always enjoy learning new things about this stuff.

Less noise and more power sounds awesome :thumbup: I'll look into the pipe.
 
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hone

hone

150cc
You know, since i already opened the tunnel for cooling i think i might as well throw a pipe in there. I'll use the ES40G from EScomposites. I'll need to find a header though. The bolt pattern on my EME is the same as the DLE 30.
 
dth7

dth7

3DRCF Regional Ambassador
hone1er said:
You know, since i already opened the tunnel for cooling i think i might as well throw a pipe in there. I'll use the ES40G from EScomposites. I'll need to find a header though. The bolt pattern on my EME is the same as the DLE 30.
Click to expand...

I'm going to be piping my DA 35 for the 78 and I can't wait. Not sure how to to do it but Cody and Gary say they are going to help (right guys!). We should compare notes on performance. Just sent all my Hitec servos back for a "tune up" so I'm on the way to setting this bad boy up. I have Santi working up some vinyl for it too.
Good luck with yours.

Daren
 
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dth7

dth7

3DRCF Regional Ambassador
hone1er said:
Got a few more flights on the Extra. Tried a 20b but i think i might need to go down to a 20a. The engine would bog/die if kept at full throttle too long so we richen it a touch and i also cut a hole in the covering so air could come out of the tunnel. That helped but it didn't solve it. The cowl is getting plenty of air in/out. The engine had good transition with no hesitation and idled well so i believe it is tuned good so i think the prop is too much(i'm at sea level). IIRC the tach showed only around 6450-6600 at full throttle, i think others reported 7000 but i don't know his elevation.


Some people don't like that the plane comes with aluminum LG but I actually like that because if i have a dead stick that results in a less than perfect landing i can just bend the gear back into shape. I'll probably get the carbon gear when everything is broken in and running perfect but for someone getting there first gasser i think the aluminum will save you money in the long run.

My CG is a little further back than i like. I'm actually perfectly neutral when i roll inverted but i prefer having it a little forward of that. I'm using 2 x 2s 1300s to power the system and i have no more room to move them forward so i'm going to get some 1600-1800s. Hopefully that'll put me where i want to be and i'll be able to fly an extra flight or two before switching packs.

I wanted to put a ES pipe on it but that would move my CG further back right? I guess replacing the carbon spinner with something heavier would be a good place to start. The one i have is 3'' and looks a little small on the plane actually. Any suggestions for spinners would be great.

Since the engine is still breaking in i've been flying mostly precision and it is LOCKED IN! I love it! Even with the CG not perfect the plane is tracking great. I can't wait to start bringing it down low.
Click to expand...

This is funny. It sounds like you and I are almost at the exact same place with our fleet and planes. Winter and snow is putting me a little behind on the 78" but I'm itching to go. I was wondering about bending the aluminum gear. I ordered wheel pants and was considering putting them on the aluminum. I may reconsider and use the aluminum as the "training wheels" as you suggest and then do a CF upgrade with the wheel pants. Do you just vise, grab and bend or do you heat it up? It's thicker than any other Aluminum gear I've had and I'm just not sure how best to handle it (literally!). I do realize any bending should be done off the airframe (or is that a bad assumption?).

Thanks for leading the way with the 78.
Daren
 
hone

hone

150cc
No problem! There have been many before me so i'm just following in their steps.

I actually haven't bent the gear yet but it's nice to know it's got some flexibility. I put the pants and fairing on because i'm going to fly it this way for a while.

I would absolutely LOVE to have a DA but that isn't where my money is at right now so i had to budget on the engine choice but it's turning out really nice so far. Can't wait to see what a pipe does for it. Post your results here when you get yours running and we can try and compare the performance.
 
3dNater

3dNater

3DRCF Regional Ambassador
Just finished a pre-order for an EME. Should be here at the beginning of next month :D Looking forward to trying it out.
 
dth7

dth7

3DRCF Regional Ambassador
hone1er said:
No problem! There have been many before me so i'm just following in their steps.

I actually haven't bent the gear yet but it's nice to know it's got some flexibility. I put the pants and fairing on because i'm going to fly it this way for a while.

I would absolutely LOVE to have a DA but that isn't where my money is at right now so i had to budget on the engine choice but it's turning out really nice so far. Can't wait to see what a pipe does for it. Post your results here when you get yours running and we can try and compare the performance.
Click to expand...

I know it's more but I wanted to go the proven route with my first gas.

Will post when I have info.

Anyone else have any hints on bending the aluminum gear? Thanks.
 
hone

hone

150cc
I had a AWESOME day with the Extra today! I cut the cowl out a little more and the temperature readings after flights went down 40 degrees. My engine didn't quit on me once so after a few flights i brought it in for some low n slow fun. This plane can slow down SOOO good. The harriers were just ridiculously easy and locked in and of course inverted is even more stable if that's possible. It floats like a foamy but it's got the right weight for snaps and high energy moves i like. I'm loving the plane! I have my timer set for 10 minutes but i just let it go off and keep going for another 2 or 3 minutes :tongue:




I really want to do a smoke system but i'm using all the channels on my A9 already.
 
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