josephcraig

my lines seemed to always start leaking after several weeks and i think it engine problem..so i'm gonna try the sullivin heavy duty cover so i can tighten it more..

earlwb

OK, when using gasoline with any type of tubing, you need to clamp the fuel tubing onto the metal or plastic tubes. I use Zip ties for the ones I don't need to mess with often (including inside the fuel tank too) and wire spring clamps or simple twist wire for the others. You can get a bag of small zip ties cheap too.  The flex tubing tends to get soft over time and thus it loosens up on the fittings. I know some older types of tubing like neoprene rubber tended to get hard after a while, but Tygon and others seem to get more soft being exposed to gasoline.

ozzydude

I just saw on horizon's website that seagull is coming out with a Super Chipmunk 46-55 ARF. Wondering if i should go with the 10cc or go with the 15cc. What you guys think? You'll have to download the manual to get the specs but its 8lbs.

AA5BY

Hmmm... Horizon hasn't posted an engine recommendation yet. The Chipmunk looks to be on the border line between the 10 & 15 so I guess one could go either way. How is that for waffling and being no help.

Given no testimonials yet, I'd likely choose the 10 based on my dislike of adding more weight than is needed but if I knew that the plane needed more nose weight to balance, I'd certainly do so with the extra power.

I've got a Seagull Spacewalker II 120 that was powered with a Zenoah G-26 and it required 2-1/4 oz of tail weight (that is huge), leaving me kicking myself for not using a lighter engine. I'm betting the plane is 10-12 oz or more heavier than it should be. If building something that could use the G-26, I'll pull it off the Spacewalker and repower with likely an Evolution 20GX.

I chose the G-26 following the lead of others who had chronicled using it but had not detailed the need for tail weight.

rhd-RCU

My Feedback: (36)

At 8 pounds I would opt for the 15cc.

flyinwalenda

My Feedback: (5)

The 15 is 10 ounces heavier than the 10 and the 15 is almost 25mm taller than the 10. I don't know how much cowl you would have left with a 15 side mounted in it.
The Chipmunk's wing is thinner than the Meridian and all of the other specs are similar so it will be a faster flying plane. I think the 10 will be plenty for it.

mattnew

My Feedback: (2)

This was all taken with a 12x6 evolution prop. 87 octane gas..... video shortly... working on making it smaller

Idle....


WOT....I top out at 10700 on the ground...

mattnew

My Feedback: (2)

[youtube] http://youtu.be/BYGrHB9ZGzc[/youtube]

ignore the tach in this one where I accidentally switch it to 3 blade... throws the numbers all off..
[youtube] http://youtu.be/TY7h4VBjs1M[/youtube]

dbar101219

$250 for a 40 size plane that can't be right

has anyone tryed gas with lower oil % with 20-1 I still get a lot of oil on my plane I have put a little over a gal throw it I was also hoping to get more power out of it with less oil

thanks

ozzydude

Yeah i'm thinking the 10cc will be just fine for the chipmunk. Not sure if i'm gonna jump on it or wait till others get it and see. I had a Goldberg years back and loved it but for 175 bucks for a kit compared to 250 for this one hmmm idk...a no brainer if the quality is there with the Seagull but since i've never owned a Seagull plane i'm a little hesitant i guess.

ozzydude

Wanted to say thanks for the Meridian build thread. It helped me alot when putting mine together.

mattnew

My Feedback: (2)

Admittedly I have a fairly slow by todays standards futaba s148 servo on my throttle. Its possible that a faster servo maybring on issues as you describe.

With my throttle settings I use the computer to set my low stop limit to right around 1800 rpm. If I go lower to 1700 rpm it will become inconsostent and stop occasionally but at 1800 rpm im well below stall speed of tge plane and cany maintain level flight soneeding a lower rpm isnt necessary. In a light breeze I can even fly backwards a bit.


Apologies for the typos.....im replying on my phone and for some reason with the rcu forum going back and fixing typos is buggy. It keeps sending me to a different page wheb I try to edit.

FlatSpin

My 2d and 3rd gallons are 25:1 with Klotz synthetic. Less "goo" and I have a 12x6 with upper 13000-lower 14000 RPMs.

Dave

flyinwalenda

My Feedback: (5)

Well that's good to know that the Klotz oil is OK as it's what I use in all my other gassers. I switched over to Klotz after 2 gallons of dino-oil in the 10GX then had the supposed issue with the crank pin after another 1/2 gallon of Klotz. . Still waiting on the word from Horizon about the repair.....they have had it for a week.

dbar101219

Dave

is that rpms on the ground or in the air??? I just got mine on new plane with a mac muffler and life barttery and a apc 12x6 prop and I can only get 10,700 on the ground.It has seen alittle over a gal of gas

FlatSpin

dbar,

On a 12x6 APC in the pits at WOT, I get low/mid 12000s, in the air I get routinely mid/upper 13000s and coming out of a shallow dive setting up for a high speed pass the max I've seen was 14468. I'm still experimenting with props. I kind of like the 13x4 APC so far.

Dave

dbar101219

Dave

do you know what your rpms are on the ground????

FlatSpin

dbar,

I get low/mid 12000s.

Dave

mattnew

My Feedback: (2)

10700 for me on the ground....I dont have the telemetry hooked up..so I dont know what it is in the air....I fly futaba....this is one place having nonstandardized sensors hurts both companies...

AA5BY

Using JR DMSS here and the sensor does not work with it either.

ozzydude

Just got done flying and the day started out kinda bad cause the motor starting missing real bad in the Meridian and couldn't figure out what was going on. I checked for air leaks and all was good. I replaced the spark plug and still the same thing. Then i looked at my voltage meter when at WOT and it was going from 6.5 down to 4.0 and bouncing around inbetween. I'm using a new 1100 liFe pack for the ignition that i charged this morning so i put it back on the charger and it only took 190mah to top it off. I put it back in the plane and problem was gone. I flew it for 5 more tanks without any problems and motor ran great. So not too sure what to think of it. Maybe i'll just get a lipo instead for ignition. Anyone else came across this problem?

[email protected]

My Feedback: (1)

IAM FLYING 3 PLANES WITH ZENOAH 20CC GAS AND I USE A BATTERY FOR THE IGNITION AND ONE FOR THE RECEIVER NO TROUBLE AT ALL

ozzydude

Yeah but the ignition is totally different so your probably using nicad or nimh for the ignition unless your using a BEC or something like that. I use 2 6.6V LiFe packs..1 for the ignition and 1 for the receiver also. Maybe the battery im using needs to be cycled since its new but idk..

flyinwalenda

My Feedback: (5)

I am flying it with a lipo on ignirion and get around 6 tanks on a charge so you are OK with the LiFe, However, remember that a LiFe has a flat discharge curve in relation to voltage and capacity compared to a LiPo. A LiFe will drop down a bit in voltage and stay there as capacity of the pack declines until both voltage and capacity drop off the cliff. A LiPo will continue to loose voltage along with capacity so it's much easier to tell when the pack is nearing discharge. You just need to set a baseline for the numver of tanks that a fully charged pack can support on igbition and don't fly beyond that number.

AA5BY

My guess is that there was some kind of loose connection in the ignition system. You likely placed a Y-harness in line so as to check the voltage level but may have removed the battery to charge it and when reinstalling avoided the loose connection. If by chance you measured the voltage level at a normal charge jack... then the switch was not fully on and was vacillating between being on and off.

Interesting problem... let us know if you discover anything.