RE: hottest weather to hover safely?
[quote]ORIGINAL: Ih82crash Probably the most important thing you can do is to make sure your engine air is ducted well. I have hovered here in Nevada when it was in the high ninety's, but Im sure it gets much hotter there. When it gets abobe one hundred, (40 degrees C) just stay away from the extended hovers. It might pay to get a temperature gun and keep an eye on your engine temp. [/quote] this feels comforting for someone who is addicted to flying and keeps resisting ending the season :) These days, before the real hot summer starts here, some of us try to reach the runway at dawn, and stay for 2-3 hours (from 5 am until 8 am) or until the temp reaches 35 C (95 F). Last week I was flying while the temp was around 34 C (included some hovering) , and as soon as I landed and shut off the engine, I used a temp gauge on the ground pointing to between the second and third cyl fins, and engine temp was around 85 C but kept going higher until it reached 95 C. I am guessing this is considered safe! I am using a louver in my yak to optimise the air flow.
Posted on: 5/6/2012 12:16 PM by Author "q8cub" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=11070436

RE: what is the hottest weather for gas engines to run safely?
[quote]ORIGINAL: w8ye I was talking about the Air - fuel ratio and the mixture needles [/quote] I Bought the plane used but it was almost new, as it was flown just enough to break in the engine. I did not change the needle setting since then. By the way, there is black residue always coming out of the muffler and it accumulates on the tip of the muffler outlets (pitts muffler). Someone told me that a DA-50 should not do this when he noticed my plane had some traces of oil on the body of the plane (not much but I have to clean it at end of day).
Posted on: 5/4/2012 6:32 PM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11068825

RE: what is the hottest weather for gas engines to run safely?
[quote]ORIGINAL: w8ye If you can take it so can they. Make sure your mixture is set correctly. [/quote] Well, as long as it is less than 37 C I guess it feels comfortable to be outside. By mixture, do you mean the oil/gas mixture ratio? And should I increase it more than my usual mixture as it is 40:1 redline according to DA-50 manual. Also, would hovering be considered safe in such hot weather? Thanks
Posted on: 5/4/2012 5:26 PM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11068745

hottest weather to hover safely?
I thought this thread would be more suitable than the "gas engines" forum to ask this question since it is related specifically to "hover" aspect of a gas engine when the engine experiences max rpm for a relatively long period of time with relatively less air cooling. It is starting to get hot here in Kuwait as the air temperature ranges between 40-43 C as highs and 28-31 C as lows. Many guys here already ended their season as they think it is getting too hot to run gas engines especially for 3d flying. Is there such a thing as maximum weather temp to run gas engines safely without damaging the engine? TIA
Posted on: 5/4/2012 5:22 PM by Author "q8cub" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=11068736

what is the hottest weather for gas engines to run safely?
It is starting to get hot here in Kuwait as we are getting highs of 40-43 C and lows of 28-30 (very early in the morning). What weather temperature is considered "too hot to fly gas engine planes" if there is such a thing? Assuming the engine is a DA-50 and inside a cowl well baffled and there is a louver to allow optimum air cooling in a size 50cc yak.
Posted on: 5/4/2012 5:08 PM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=11068721

RE: DA-50 with 24x8 prop
[quote]ORIGINAL: a1pcfixer [quote]ORIGINAL: q8cub Do you think 22x8 will provide better pull out of a hover? I am using it on an EF YAK which is slightly bigger than an average 50cc frame. [/quote] If you mean this one..... Wingspan: 88 inches Length: 86 inches Wing Area: 1450 sq. in. Weight: 16.5-18.5 lbs Power: 50cc-60cc Gas .....and you do your best to keep it UNDER 18 lbs, then yes. Around 18
Posted on: 3/13/2012 9:35 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10998485

RE: Extreme Flight 88
Thanks guys for this informative thread about the EF YAK 88, I have a DA-50 engine on my EF YAK. I am still feeling I have to struggle when I pull out of a hover. I am using a menz 23x8 prop. The DA-50 manual says it can support 24x8 prop. Anyone tried it? And what about the 22x8? Would it provide better pull out of hover? Thanks in advance!
Posted on: 3/13/2012 8:04 AM by Author "q8cub" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=10998343

DA-50 with 24x8 prop
DA-50 manual says it can take 24x8. However, I couldn't find posts about using this combination. Anyone tried this combination ?
Posted on: 3/13/2012 7:40 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10998143

RE: DA-50 with 24x8 prop
[quote]ORIGINAL: a1pcfixer You probably meant a Menz 24x8, not a 24 x 3.[:)] The 24'' props are best left to the DA-60's. A DA-50r runs best on a 22'' and some cases a 23'' Spool up of the eng will really suck on a 24'', it's slightly noticeable with some 23''. [/quote] Yes, obviously I meant 24x8 as you mentioned. Thanks for correcting me. Do you think 22x8 will provide better pull out of a hover? I am using it on an EF YAK which is slightly bigger than an average 50cc frame.
Posted on: 3/13/2012 7:38 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10998311

RE: Can a DA-50 sustain hovering at 3/4 throttle?
[quote]ORIGINAL: mrbigg Cowl baffled? [/quote] I assume the term "baffle" means the cowl front opening size should be smaller than cowl air exit opening? Well, my EF YAK cowl is open from the front, and nothing has been modified to the air exit opening: just the default setting. Today, after 10 minutes of flying (with a couple of short hovers), I was able to touch the muffler but it was very hot! I could touch it but I could not leave my hand on it for more than one second (the muffler part where it meets the cylinder head). The cylinder head was little cooler than the muffler which is what is expected I guess. The temp here in Kuwait was around 18 C.
Posted on: 2/22/2012 12:03 PM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10970913

RE: Can a DA-50 sustain hovering at 3/4 throttle?
[quote]ORIGINAL: Jezmo Get one of these onboard temp recorders and then you will know for sure how long you can hover. They're quite inexpensive. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXGZK7&P=6 [/quote] Thanks for the info. And assuming I know the temp of the engine, what would be the dangerous temp at which I can't hover for more than 30 seconds!?
Posted on: 2/22/2012 11:23 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10970863

RE: Can a DA-50 sustain hovering at 3/4 throttle?
[quote]ORIGINAL: MetallicaJunkie if its a brand new engine i wouldnt hover for too long... if it is broken in, ye,s hover as long as you can [/quote] I bought the plane used but almost new. The engine was just broken in and just converted the oil mix to synthetic. Only 4 flights on synthetic. I can put the question in a different way: Does flying around at 3/4 throttle put the same load on the engine when it is hovering at 3/4 throttle? I am guessing the answer is no.
Posted on: 2/21/2012 4:00 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10968728

Can a DA-50 sustain hovering at 3/4 throttle?
I have an EF YAK 88" which, according to the manual, is designed for 50-60 cc engine range. Currently, this yak has a DA-50. Since the EF YAK 88" weighs 2 pounds more than an average 50cc 3d plane, I have to use 3/4 throttle during a hover. My question is: Can a DA-50 handle 3/4 throttle hovering (average hovering time around 30 seconds but could last as much as a minute). Thanks in advance!
Posted on: 2/21/2012 2:49 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10968695

RE: Can a tiny epoxy spot on a spinner cause vibration
[quote]ORIGINAL: dirtybird If your plug is black you are running too rich. Lean it down a bit and you might reduce the vibration. [/quote] Now I have a new plug plus the muffler has a gasket. It seems slightly better but still vibrates at idle. I ran the engine today and flew the yak a couple of flights. Just a brief hover and some knife edges and couple of loops. I noticed when inverted there is, but am not 100% sure, small hesitation in the engine. Would a rich setting cause hesitation while inverted maybe? Also, the engine has just been broken in, and had only few flights (5-6 flights) with synthetic oil (redline 1:40 mix). And, there has not been any changes to the factory low/high needle settings.
Posted on: 2/18/2012 7:15 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10964378

RE: Can a tiny epoxy spot on a spinner cause vibration
[quote]ORIGINAL: dirtybird A two cycle gasoline single cylinder engine will vibrate. There is no way to get around it. Your installation may have a resonate spot at low rpm that exaggerates the problem. Make sure the engine is secure and avoid that RPM if possible. I doubt if a small spot of epoxy on the spinner has anything to do with it. [/quote] seems logical. The vibration is huge at low RPM. The whole plane shakes hard. If I up the idle, then it becomes too fast for landing. What about the spark plug? It is the same one that was used during engine brake-in. I opened it the other day and it was black and replaced it with a new one. One more thing I did which I haven't tested yet. The muffler was leaking small amount of black burnt oil. I removed the muffler and installed a gasket and put it back on again. Now I have done two things: New plug and muffler gasket. So, if the vibration reduces I would not know which was the fix :)
Posted on: 2/17/2012 1:33 PM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10963520

RE: Can a tiny epoxy spot on a spinner cause vibration
[quote]ORIGINAL: SpaceCowboy It could cause vibration just like any dirt could. I think it might be more prevolent on a light weight carbon fibre spinner than an aluminum one. Did you check the balance of the spinner & prop ? Don't forget a single cylinder engine has vibration especially at low RPM. A fouled spark plug could also cause vibration. I hope this helps. [/quote] Thanks for the reply! For balancing the prop, I have to admit I never got to balance one before. Do I need a special tool to do this? Anyways, the prop is new (Menz 23x8) and I used a gig to drill the screw holes.
Posted on: 2/17/2012 1:26 PM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10963503

Can a tiny epoxy spot on a spinner cause vibration
I have a new da-50 on an EF YAK 88". At idle, there is very noticable vibration. There is a tiny amount of epoxy on a CF spinner (which I spilled by mistake). Does this small amount of epoxy on the spinner cause vibration? What about the spark plug? After braking in the engine, spark plug was not changed. I just changed it and haven't tried the engine yet. Could this be a reason for the vibration? TIA
Posted on: 2/17/2012 1:16 PM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10963481

RE: Would a 24x8 prop put too much load on a DA-50?
[quote]ORIGINAL: skip1320 See if Rich at Wrong way RC can get you an original JC super prop 23x7,did you say how much it weighs in other post? [/quote] I didn't weigh my EF yak, but according to the manual it is somewhere between 18.5 and 19 lbs. Roughly 2 pounds heavier than a usual 50cc 3d plane. But its wings are also bigger, and I guess it should compensate the wing loading.
Posted on: 2/15/2012 10:54 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10960232

RE: Would a 24x8 prop put too much load on a DA-50?
[quote]ORIGINAL: krayzc-RCU 2 much prop you will need a header and a pipe [/quote] Did you fly the EF YAK 88" ? I bought this YAK used and was almost new, and I am too busy to add anything like a pipe or a header (I don't actually know what you mean by header). I was just thinking about increasing the prop size to the max allowed size for a DA-50 which is a 24x8. And this yak cowl is bigger than an sd model yak and seems to want a bigger diameter prop to cover the huge cowl size.
Posted on: 2/15/2012 10:50 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10960224

Would a 24x8 prop put too much load on a DA-50?
In the online DA-50 manual, it says it can take a 24x8 prop. I have an EF YAK and I feel it needs more power/thrust to make hovering easier. I am thinking about using a 24x8 prop but was wondering if it will add too much load on a DA-50 during a hover. I only tested my EF yak in two flights, and during a hover I had to struggle using 3/4 and up throttle. Thanks in advance!
Posted on: 2/15/2012 10:25 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10960201

RE: EF YAK 88 with DA-50 needs more power?
[quote]ORIGINAL: speedracerntrixie A 23X8 is pretty much max for a DA 50. It will only be worse with the 24X8. The only real way to get more out of the 50 is a pipe ( not canister ). A DLE 55 would be a direct bolt in and from what I am told responds better with a pipe then the DA. IMO you would be better off dropping some weight out of the airplane. Anything heavier then 16.5-17 lbs is going to be pretty doggy with the 50. [/quote] What about a carbon prop size 23x8? Will it provide noticable thrust to weight ratio difference than a wooden 23x8 prop?
Posted on: 2/14/2012 1:36 PM by Author "q8cub" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=10958910

RE: EF YAK 88 with DA-50 needs more power?
[quote]ORIGINAL: daveopam The DA-60 is a little heavier, but only because the crankcase comes back further than the DA-50.(see pic) Because of this, it uses 1'' less of a stand off which saves the weight difference to a certain extent. It also will use a different header as it has a round port on the exhaust. So keep that in mind if decide to step up. david [/quote] Thanks David for the help. Honestly, I prefer to try a bigger prop first and see how it performs. I am just wondering if anyone tried a 24x8 prop on this frame. Also, would a carbon prop perform better than a wooden prop. I have a menz 23x8 on it now.
Posted on: 2/14/2012 1:03 PM by Author "q8cub" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=10958873

EF YAK 88 with DA-50 needs more power?
I just purchased a used EF YAK 88" with a new DA-50 engine on it (just broke in). The plane is almost new and have been flown just enough to break-in the engine. I noticed, compared to my SD model yak, it seems heavier in pulling out of a hover. The DA-50 manual says it can have a 24x8 prop. My question is: Will the 24x8 prop perform better on the EF YAK with da-50 engine ? Thanks in advance!
Posted on: 2/14/2012 12:53 PM by Author "q8cub" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=10958596

RE: EF YAK 88 with DA-50 needs more power?
[quote]ORIGINAL: krayzc-RCU put that motor on a carbon fiber pipe and header or pull the trigger on a DA 60 [/quote] Does the DA-60 have the same weight as the da-50? Or at least, difference between DA-50 and DA-50 is few grams perhaps?
Posted on: 2/14/2012 12:47 PM by Author "q8cub" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=10958847

HS-5955TG burn and smoke
Three guys at our local field had their HS-5955 burn and smoke. They all use A123 batteries? Are there know issues with A123 batteries used to power the HS-5955TG servos? Thanks in advance!
Posted on: 2/9/2012 12:28 PM by Author "q8cub" in the forum "Hitec/MultiPlex Radios- Ask Hitec Customer Service"
http://www.rcuniverse.com/forum/fb.asp?m=10951589

HS-5955TG burning issues
Three guys at our local flying field had issues with HS-5955TG servos. They all had their HS-5955 literally burn and smoke. They adviced me to avoid them. Also, all these guys are using A123 batteries. Could this be the reason? I read somewhere they don't like voltage above 6 volts.
Posted on: 2/9/2012 11:29 AM by Author "q8cub" in the forum "RC Radios, Transmitters, Receivers, Servos, gyros"
http://www.rcuniverse.com/forum/fb.asp?m=10951519

RE: Needle bearing of dl-50 fits da-50?
[quote]ORIGINAL: BadAzzMaxx Once removed and reinstalled they never seem to be as good as they were before you removed it. [/quote] It seems it is not easy to do. I just wanted to save time, since it will take me time to send it to DA and back to Kuwait. Anyways, I think it is the only option. Thanks
Posted on: 2/8/2012 10:49 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10949877

Needle bearing of dl-50 fits da-50?
I need to replace the needle bearing in a da-50 engine. When I checked on ebay, I only found this, [image]http://www2.gpmd.com/image/d/dleg5517.jpg[/image] It is a needle bearing for a dl-50 engine. Would it fit the da-50? If yes, is it easy to replace? TIA
Posted on: 2/8/2012 10:38 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10949864

RE: DA-50 clicking noise - Video included - Update II
[quote]ORIGINAL: BarracudaHockey Hmm....crank bearing you say? [/quote] [image]http://www2.gpmd.com/image/d/dleg5517.jpg[/image] I am sorry I just found out it is called "needle bearing". Does the dl-50 needle bearing fit the da-50? (is it exactly the same part?) If yes, is it easy to replace?
Posted on: 2/8/2012 10:33 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10949850

RE: DA-50 clicking noise - Video included - Update II
Well, Yesterday while hovering the engine died again! And another pancake landing :) And when I opened the engine, I found the crank brearings (the one that fits on the connecting rod) was broken in pieces. The little cylindral shaped bars inside the brearing were broken and coming out. I guess the noise indicated a problem that I should have paid attention to. I learned a lesson. When you hear a strange noise in the engine, there is something wrong indeed.
Posted on: 2/8/2012 3:08 AM by Author "q8cub" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10949281