rc74

My Feedback: (6)

Just finished my 1/3 Spacewalker with the 50CC Twin. Hope to maiden the weekend.

Super08

My Feedback: (2)

That is going to be a match made in heaven. Very nice job!

Tseres

Nice plane. Nice job on mounting the engine.

Old Tom

Mr.FiberOptic

very nice, might have some engine cooling issues i would think.

have fun with that awesome bird. i hope we get to see a video of that one

rt3232

My Feedback: (6)

Ok Guys

I picked up a 26 at the Toledo show and finaly got it installed in a bird and out to run

Prop 16 x 8 apc Fuel 100 ave gass at 30 : 1 ashless oil

carb came with both needles all the way in (closed) so I set per the book, after a coupla of failed atemps due to over chocking on my part it started vary easy let it run @ 2400 to 3000 rpm for 5 min+ then checked for idle, after end point adjustment idle is @1900 +/- 25rpm let it run for another 10 min @ 2400 then went to full throtle for short time transition was a bit ritch back to 2400 tweeked the lo needle about 1/8 turn lean cleaned transition up vary nicely let it run at about half throtle (did not check rpm) for about 5 more min went to full throtle held for 3 min 8160 rpm backed off to mid range for 5min and shut down, tried a hot start 1 flip choke and 5 flips to start checked for repeat of settings and rpm's lowend idle droped to 1850+/_ 25 but full throtle went right to 8160 and held there. total run time 32 min

So at this point I am vary pleased, will check check out all bolts fittings etc, and if the weather will coperate we will go flying.

Ps 16 oz tank when I got home and there was still about 3oz fuel left to de fuel

Cheers Bob T

Tseres

Good Job Bob. Looks like you got it.
Think Henry said to break in the 26 with a 17-6 prop.

Old Tom

goirish

Hummmm!!! I was told 18/8 for my 26. Idle 1850WOT 7200. Transition needs a little tweeking, but will run it some more. I think the low end is still a little rich. What prop should I be using?

OldFart1

Henry originally told me 18x8 also - couldn't get to run anywhere near 7200, my P-47 was dog slow (and guzzled fuel) with that prop. I'm running a 16x10 now, my buddy Gary runs a 16x8 - I'm quite a bit faster (we haven't compared fuel consumption)

Nogyro

My Feedback: (10)

I'm using a Xoar Beech 17x6 on my 26 and taching 8140 after two gallons of fuel (10 hrs run time). It's just now broke in, so be patient with these engines...... I'm flying it in a Hanger 9 FuntanaX 100, so I'm after thrust for 3D, not speed for like in a war bird. I've tried a Xoar 17x8 and it was just too much prop for this engine. Rpm's dropped way off and so did performance. It appears like this engine likes to turning at around 8,000 or so to get the max power out of it.

Tseres

Sorry Henry I didn't mean to start another war.
It is possible that I don't remember correctly. I'm new and have to much info cluttering my head.
It also seams to me that you guys found out that 18-8 is to much for you. So we are in the right direction.
I don't think there is an exact science to this, just ball park figures. Look at all the differing opinions.
I do value the information however. So thanks anyway.

Old Tom

rt3232

My Feedback: (6)

One more thing

while it was running it the end of last full throtle run held my finger to the head fins and held for about 30 sec and then to the lower case was not enough to make pull mt finger back, but if I can hook up with one of our club member who has a I/R thermal gun will try to get a more accurate reading on temp.

this is uncowled

Cheers Bob t

Ps will be going to 18 x8 as sone as I can get to my LHS

Ken6PPC

Ron, that Spacewalker is just GORGEOUS! I hope you are bringing it to the show Thursday. Can't wait to see it in person.

rc74

My Feedback: (6)

Cooling may be a problem I agree. I have built in some cooling ducks in the top cowl to flow air around the back of the cylinders. The lower cowl has two large openings in the front and a large opening in the rear to get rid of the hot air. I will be takeing temp. reading for several flights to see if I need to open up the air intakes. Thanks Ron

Hobbsy

My Feedback: (102)

Hey there piston, I see I'm going to have to change my Avitar, I can't see my pistons do that.

Crash-RCU

Do you think the 26 would be a good match for smaller 67" ws Goldberg Yak. I am using a Saito 125 now and it flies ok but is under powered.

T3beatz

My Feedback: (4)

Hey guys just for your Info, I changed out my prop on the 20cc to a 17x4W APC and was getting 8100 RPMs... This is with no muffler. Ohh yeah... forgot to mention I fly 3d thats the reason for that prop.

Edwin

My Feedback: (2)

I fired up the 20cc this evening. What a really nice engine. Started just like the instructions said. Couldnt be easier. You got a winner here Henry. I have almost a hour run time on it. Didnt get a chance to fly the rascal110 with it. Ran into one loose engine mount thats behind the firewall. Thats not a fix at the field kind of thing so I shut her down and flew the other plane. But the idle is settling down nicely and ready to start tweeking. Two guys at the field saw it and really liked it. Henry, I'll be placing another order for one in a week or two and a third one about mid summer. I got to thinking, for a 120 sized replacement, this engine would be ideal on the Don Smith 169"ws B-29. My dream plane. He!!, I'll buy a fourth around Oct.
Edwin

ace1726

Hey Piston, I'm at witts end!!!! I started from scratch. Fresh fuel, right mixture, 32:1, NEW plug, 1.5 & 1.5 turns out on both needles. I cycled my battery, and re charged it. It shows correct voltage. I also pulled another reciever battery from another plane. Same thing. The only way this this would start is when I installed my 6 volt reciever batt. from my Corsair. I don't think I should have to use a six volt batt to get this thing to run consistently. It has never turn on with ANY 4.8 volt batt. What else can I check?? What am I doing wrong?? Please help..

Piston

My Feedback: (1)

Hey Ace1726

Let's check your engine by the facts presented.
1. Engine starts with 6 volts... - as an aside question... is it running well with the 6 V?
2. Fresh fuel - no problem
3. Oil/gas - correct
4. New plug... - question... is it gapped properly.... with CM6 plugs, I find a twenty thou gap to work well.
5. needles reset - correct

Okay now... we have the basics here.

2 stroke engines require three things.... fuel....air....spark....and they will run... (yeah... this is a simplistic analogy... but it works for my simple mind )

You have the fuel.... you have the air.... the only thing left is the spark......
a. check the spark plug gap first... though I do not think that should be a worry.
b. the batteries are next.....the ignition system works on voltage.....I do not know the condition of your batteries (the 4.8V or their age). However, you did double check with your other receiver battery. One customer did go through 3 packs he thought were good, only to find they all had a bad cell...... For my peace of mind.... try a fresh 4.8v pack.....
c. Is the ignition cap properly secured to the plug. It does take a good amount of effort to secure those caps. If the cap is not on tight.. ie it should cover the spark plug hex portion,.... it will cause erratic engine starts and runs....
d. It may be a problem with the ignition system..... the RCXL system is a great system and we have not had any returns on new ones... That said... we need to look at everything here. This would be the last thing I would look at.

OK..Message to the Aerovate family... hey guys... Have I missed something here.... (I only had one coffee this morning !!!!)

Cheers
Henry

Edwin

My Feedback: (2)

Ignition switch? I had a similar problem recently on a new 40cc from somebody else. I couldnt get a hot enough spark, I thought. 6v helped but still not enough to run the engine. I bypassed the ignition switch (plugged battery directly into ignition) and it fired right up. New switch, no more problems. My linkage was also set too close to closed. It would eventually flood and like this engine, wont start in a flooded state. Zenoah start proceedures dont apply here. My zenoahs like to be dripping wet to start. Thats what worked for me.

To debug, I was using the spark plug and looking for a spark (CM-6) and I was convinced it was not hot enough. Pulled the plug out and stuck a screw driver in the cap (you dont have to ground it to the engine) and got a good bright 1/4" spark. I'm used to seeing a nice bright spark on plugs from car wrenchin days. I'm pretty sure the switch had high resistance going through it. It was a standard wire harness switch so I upgraded to a heavy duty JR switch. Got two flights on that setup yesterday.
Edwin

DaddySam

My Feedback: (9)

I think you've covered it Henry. I'd pull the plug and hook up the battery and turn the engine over to make sure we're getting spark. I'd also bypass the switch and hook the battery directly to the ignition to eliminate that possible source of problem. If he's not getting spark at the plug with 4.8 volts but does with 6, I'd be thinking it's the igntion. As an aside, would the Hall sensor cause a problem? Maybe the air gap should be checked....
Sam

ace1726

Hey guys, thanks for the replies.. I went out and got a new JR 1500 Mah Nimh... Cycled it, charged.. and Nothing. I made sure the cap was ALL the way in!! Yes, it does cover the hex portion of the plug. I did BTW bypass the switch and hooked up straight to the ignition. Still very weak spark. Also, with my six volt it runs okay, but not very consistent. One time it will run like a champ, and then it will quit by itself like at mid throttle. I tried various plug gaps, and ended up at .020 This seemed to yield the "sort of" hottest spark. I am leaning towards an ignition issue. All the basics are there. Plenty of fuel, fresh plug, and air.... just need hotter spark.

AJsToyz

Mine does not seem to have a hot spark, but if you take the plug out it will shoot the spark from the wire to the boot. Thats about 1/2" or so and you can hear it a mile away ... well a few feet away. Mine ran like total crap , turned out to have a dirty carb. Would cut out, then flood out , then would not transition , its all good now.

Andy

ace1726

You know, it's funny you say that. I also tried it and the weird thing is that is was not consistent. You could hear it arcing somewhere, but not to the boot. If I can get that kind of spark to the plug, then I'm sure I would have no problem. Also, at least yours ran!!! If I don't have the six volt, then it won't even try to fire up. That is an indication of a spark issue. Thanks for the reply...

goirish

I guess I was thinking that all of them were run at the factory. How could the needles be screwed all the way in?