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Jan 01, 2010, 02:04 PM
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ssflylow's Avatar
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Last edited by ssflylow; Jan 04, 2010 at 10:58 AM.
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Jan 01, 2010, 03:59 PM
Just go with the flow
goflyhighrc's Avatar
Quote:
Originally Posted by blucor basher
gofly - On most gas engines, you have a choice of

stock muffler (small, light and loud)
Pitts style muffler (little bit quieter, little heavier)
Canister style muffler (lives inside fuselage, very quiet)
"tuned" pipe (long, expensive, more powerful, quiet)

We're working to have all of those options for the 72". More details to follow.


the DLE-30 produces about 2500 watts equivalent, about like a good 8S system.
On the canister muffler: If it lives inside the fuse, where doe the exhasut exit.

With the tuned pipe: Is the muffler long and run along side the fuse?
Jan 01, 2010, 04:28 PM
↓↘→ + (punch)
theKM's Avatar
Quote:
Originally Posted by Shawnlh
It looks like the motor choice will be the Scorpion S-4035 series. What Kv though, I'm not sure, that will depend on prop choice.
I was looking at the 4035-460, with a xoar 19x8, Hyp. CX 4s 4000's x2, WR Hercules Super bec, and a CC110HV. That should do the trick and get close to 2500 watts at around 85 amps peak.............I think.
I'm running the 4035-380 on 6S in the 65Vyper... this alone could poke the 72 Extra along very well with a 19x8 (I'm using an 18x8 at the moment). With volts from two more cells, means this wattage goes up a bunch as it is... I reckon the low Kv's is what you're after on 8S. I'd rather prop up to get wattage (bigger props rock 3D so nicely) than turn smaller props faster to bring the wattage down on too high a Kv motor.


I really dig the 4035 motor though, a sweet piece of equipment.
Jan 01, 2010, 07:12 PM
ExtremeFlight - 3DHS - Legacy
blucor basher's Avatar
Quote:
On the canister muffler: If it lives inside the fuse, where does the exhasut exit.
It makes a U-turn and exits out the bottom of the fuse right behind the cowl in front of the landing gear.



Quote:
With the tuned pipe: Is the muffler long and run along side the fuse?
It's long and runs inside the fuse and exits out the bottom behind the wings.
Jan 02, 2010, 12:46 AM
Registered User
jadamian75's Avatar
Quote:
Originally Posted by G.P.
I would do alot of ground testing before using the internal BEC on 8s. You'll be pushing both the ESC and BEC to their limits, which means lots of heat. You'll have to choose your servos carefully and make sure that there is absolutely NO binding in your setup. Keep in mind that the internal bec is rated at 5 amps max....and I don't know what input voltage that is rated at. Max bec output goes down as input voltage goes up.

Probably easier and safer to go with an external BEC or seperate Rx pack.
+1

Joe
Jan 02, 2010, 12:54 AM
Pants on the ground
xsubsailor's Avatar
goto bed Joe
Jan 02, 2010, 01:15 AM
Registered User
jadamian75's Avatar
Quote:
Originally Posted by xsubsailor
goto bed Joe
It's 2 AM in New Jersey and only midnight in Colorado.
Jan 02, 2010, 05:57 PM
Just go with the flow
goflyhighrc's Avatar
Quote:
Originally Posted by blucor basher
It makes a U-turn and exits out the bottom of the fuse right behind the cowl in front of the landing gear.





It's long and runs inside the fuse and exits out the bottom behind the wings.
Not knowing anything about gas, the tuned pipe sounds intriguing. If it exits out the bottom behind the wings it seems like it would keep the plane much cleaner.With the tuned pipe or cannnister is there any cutting or modes that need to be done or is the plane ready to go with them.

gofly
Jan 02, 2010, 06:24 PM
Extremely Twisted
cwojcik's Avatar
It depends on the airframe. Go to the extreme flight website and read the assembly manuals for their 50cc stuff and you will be enlightened.
Jan 02, 2010, 06:48 PM
ExtremeFlight - 3DHS - Legacy
blucor basher's Avatar
Quote:
If it exits out the bottom behind the wings it seems like it would keep the plane much cleaner.
Gasoline doesn't produce goo like glow-fuel engines do. So, not really a concern.
Jan 02, 2010, 08:04 PM
Scott Stoops
sukhoi26mx's Avatar
Quote:
Originally Posted by goflyhighrc
Not knowing anything about gas, the tuned pipe sounds intriguing. If it exits out the bottom behind the wings it seems like it would keep the plane much cleaner.With the tuned pipe or cannnister is there any cutting or modes that need to be done or is the plane ready to go with them.

gofly
There are generally separate can or pipe mounts that are installed that hold the can/pipe securely. You generally remove the covering over a couple of bays in the belly which are replaced with vented plates to let air out. A little more work then setting up mufflers, but performance is enhanced with a pipe while sound is dramatically reduced with a can.

Scott
Jan 02, 2010, 08:22 PM
OOPS
Manta1's Avatar
I finally got to hear some canned planes about a week ago in person.sounded very cool...
Jan 02, 2010, 08:50 PM
Registered User
ssflylow's Avatar
Never mind..................................
Last edited by ssflylow; Jan 04, 2010 at 10:59 AM.
Jan 03, 2010, 08:16 PM
shredding Ultracote since 2009
routemech's Avatar
Quote:
Originally Posted by blucor basher
Gasoline doesn't produce goo like glow-fuel engines do. So, not really a concern.
Scott/Ben,

I know someone has probably asked this... When is it going to be available?
Are you guys flying a prototype yet?

Also I was going to make this my first gas airplane, but now thinking maybe should do a 50cc... how will this compare to one of the current 3DHS 50cc airframes like the 87" Extra?


Mike
Jan 03, 2010, 09:55 PM
Registered User
Lonelasso's Avatar

Texas Electric Flight Festival (T.E.F.F.)


Texas Electric Flight Festival (T.E.F.F.)
Just reminding everyone of this upcoming event ! (forgive me if I've already posted in this thread....my memory is a bit 'fuzzy' )

Ben and Amy are committed to attend ! Here's the link-- T.E.F.F.


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