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.25-.32 2 stroke engine choice
11-26-2009, 06:59 PM
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.25-.32 2 stroke engine choice
Gents (and ladies),
I have an ASM C-130 that I am putting together and I can't decide what engines to put in her. The manual calls for 4X .25 - .32 2 strokes. I need to decide between the options that Tower Hobbies or Horizon Hobby sells (because I only shop at my LHS and that's what he can get). I'll list what I have in mind, in no particular order and any cons that come with that choice. If I have left anything out, ie. different engine manufacturers or models, or you need any additional info please let me know. Thanks in advance for your help!
Jeremy
I have an ASM C-130 that I am putting together and I can't decide what engines to put in her. The manual calls for 4X .25 - .32 2 strokes. I need to decide between the options that Tower Hobbies or Horizon Hobby sells (because I only shop at my LHS and that's what he can get). I'll list what I have in mind, in no particular order and any cons that come with that choice. If I have left anything out, ie. different engine manufacturers or models, or you need any additional info please let me know. Thanks in advance for your help!
Jeremy
11-26-2009, 07:22 PM
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RE: .25-.32 2 stroke engine choice
Jeremy,
I have an Evolution .61 that is awesome, don't know if they make your size, but I'd sure check if I were you.
Good luck, Dan
I have an Evolution .61 that is awesome, don't know if they make your size, but I'd sure check if I were you.
Good luck, Dan
11-26-2009, 07:45 PM
#3
RE: .25-.32 2 stroke engine choice
Pick this one, It will haul the freight. http://www3.towerhobbies.com/cgi-bin...?&I=LXKF95&P=0
I have one and it will pull a barn
It has double the thickness of nickel plating of any ABN engine on the market.
I have one and it will pull a barn
It has double the thickness of nickel plating of any ABN engine on the market.
11-26-2009, 08:20 PM
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RE: .25-.32 2 stroke engine choice
Go for the Super Tigre G34's. Good power and much less expensive than the OS 25. And since they are ringed engines, they will last longer than an ABC or ABN, will be more tolerant of a lean run, and much less expensive to rebuild (a ring versus a P/L assembly). The only downside with them as being a steel cylinder engine, you have to use a fuel with castor content or be religious with after-run oil.
11-26-2009, 08:36 PM
#5
RE: .25-.32 2 stroke engine choice
I agree on the ST34 also mine is converted to diesel with a Davis head one of the sweetest running engines I have the ring is great after lots of time you replace a ring not a piston
and liner and plenty of compression as a diesel no bad habits and it is BB crank
my ST40 has been around years also with a Davis head and no issues ever martin
a little castor good in any engine and no plating to peel in a steel liner
and liner and plenty of compression as a diesel no bad habits and it is BB crank
my ST40 has been around years also with a Davis head and no issues ever martin
a little castor good in any engine and no plating to peel in a steel liner
11-27-2009, 01:09 AM
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RE: .25-.32 2 stroke engine choice
if you arnt in a hurry i have had great luck with my gms engines (.47 .32 and the th .46). the .32 i have is very reliable and powerful. not to menton cheap. sometimes th will get the engines in earlier than expected, sometimes later. if you are just starting your build i would wait a little while and see if anything new comes out or the engines go on sale.
11-27-2009, 01:23 AM
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RE: .25-.32 2 stroke engine choice
My .02 ...
Magnum .32 (true chrome ABC)
TT .36 (quality ABN)
ST .34 (ringed)
All good powerful low cost engines. Take your pick depending on what you fancy.
Magnum .32 (true chrome ABC)
TT .36 (quality ABN)
ST .34 (ringed)
All good powerful low cost engines. Take your pick depending on what you fancy.
11-27-2009, 10:59 AM
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RE: .25-.32 2 stroke engine choice
ORIGINAL: jimmyjames213
if you arnt in a hurry i have had great luck with my gms engines (.47 .32 and the th .46). the .32 i have is very reliable and powerful. not to menton cheap. sometimes th will get the engines in earlier than expected, sometimes later. if you are just starting your build i would wait a little while and see if anything new comes out or the engines go on sale.
if you arnt in a hurry i have had great luck with my gms engines (.47 .32 and the th .46). the .32 i have is very reliable and powerful. not to menton cheap. sometimes th will get the engines in earlier than expected, sometimes later. if you are just starting your build i would wait a little while and see if anything new comes out or the engines go on sale.
!), but this is known and I've been helping someone with one recently. Some have problems flowing enough fuel at WOT, others have leaks. Some have both (bonus). The rest of the engine seems great, runs like a bear. Pop a Perry carb on a pair and then I'd think about it.With multis go with well-known engines with consistent properties. If you're trying to save money, build a single. Within reason of course, but I just mean you can't tolerate certain things with multis and should not force yourself to by gambling on engines.
MJD
11-27-2009, 12:33 PM
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RE: .25-.32 2 stroke engine choice
You might consider K&B Sportster .28s. Use a little castor and they run forever. I have had great luck with the Sportster series. Look at https://shop.mecoa.com/shopdisplayproducts.asp?id=22
11-27-2009, 12:48 PM
#13
RE: .25-.32 2 stroke engine choice
Jeremy,
My flying buddy and I have built and flown 25 twins and a triple in the past 5 years or so (he builds and I fly). We have tried OS, Magnum, GMS, Thunder Tiger, Fox and maybe a couple of others. We ended up flying nearly all OS.
We found that the biggest thing with multi-engine is engine reliability. And believe me, engine reliability on a single does not transfer to a multi. We had 4 GMS .32s and never could keep both running much more than half the time. I never had one quit on a single engine plane, but on a twin, they were terrible. The same goes for Magnum. The .28s were especially bad on a multi. I don't know what it is, but put 2 engines on the same plane and things start happening. Maybe it's fuel foaming, but whatever it is, some engines are worse that others in a twin.
Also, the smaller engines do worst than the larger ones. The .46 size is more reliable than the .25 size. I had GMS .47s in 2 twins. Good engine in a single. Just not 95% reliable in a twin. I bought 4 OS .46AXs and just flew and flew, no problem.
After trying Magnum .28s and GMS .32s in 3 planes, I gave up. OS .25FXs run perfect. Mine are now on a modified to a twin, Diamond Dust delta. They have Jett tuned mufflers. It goes like all get out and is totally reliable.
Don't knock the LA engines too much. Yes, they are lower power, but they do keep running. We have used OS .40LA, .46LA and .65LA in twins. The 2 LA .40s were in a swept wing canard. A fellow club member just had to have it, so we sold it, but we never had an engine failure.
If you don't think the .25LAs will be enough for your C-130, try the .46LA. They weigh only an ounce and a half more than the .25FX and actually weigh a couple of tenths of an ounce less than the .25 or .32 AX!!! We used to say that the OS .40FP was the best .25 engine made. The LA .40 or .46 will pull a .25 sized plane nicely at a lower cost and no more weight than a ball bearing .32.
My flying buddy and I have built and flown 25 twins and a triple in the past 5 years or so (he builds and I fly). We have tried OS, Magnum, GMS, Thunder Tiger, Fox and maybe a couple of others. We ended up flying nearly all OS.
We found that the biggest thing with multi-engine is engine reliability. And believe me, engine reliability on a single does not transfer to a multi. We had 4 GMS .32s and never could keep both running much more than half the time. I never had one quit on a single engine plane, but on a twin, they were terrible. The same goes for Magnum. The .28s were especially bad on a multi. I don't know what it is, but put 2 engines on the same plane and things start happening. Maybe it's fuel foaming, but whatever it is, some engines are worse that others in a twin.
Also, the smaller engines do worst than the larger ones. The .46 size is more reliable than the .25 size. I had GMS .47s in 2 twins. Good engine in a single. Just not 95% reliable in a twin. I bought 4 OS .46AXs and just flew and flew, no problem.
After trying Magnum .28s and GMS .32s in 3 planes, I gave up. OS .25FXs run perfect. Mine are now on a modified to a twin, Diamond Dust delta. They have Jett tuned mufflers. It goes like all get out and is totally reliable.
Don't knock the LA engines too much. Yes, they are lower power, but they do keep running. We have used OS .40LA, .46LA and .65LA in twins. The 2 LA .40s were in a swept wing canard. A fellow club member just had to have it, so we sold it, but we never had an engine failure.
If you don't think the .25LAs will be enough for your C-130, try the .46LA. They weigh only an ounce and a half more than the .25FX and actually weigh a couple of tenths of an ounce less than the .25 or .32 AX!!! We used to say that the OS .40FP was the best .25 engine made. The LA .40 or .46 will pull a .25 sized plane nicely at a lower cost and no more weight than a ball bearing .32.
11-27-2009, 01:04 PM
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RE: .25-.32 2 stroke engine choice
Wow, thanks for your info Ed. I do lean more toward OS than any other brand. I have pretty much ruled out the GMS products. Magnum was never an option for me, I just don't like them.
I think the plane is going to weigh in at about 21 lbs. That's 5.25 lbs/engine. I think the .25 LAs would be fine, unless I lost one. I don't think they could pull 7 lbs each though. Thoughts?
They quit making the 40LAs right?
I am strongly leaning toward the TT .36. I like TT and I believe they share some common engineering with OS.
I am still going to look into the .46LAs before I make a choice.
I wish I could find 4 NIB .25FXs! That would make this choice so much easier!
Thanks everyone for your help. Keep voting!
I think the plane is going to weigh in at about 21 lbs. That's 5.25 lbs/engine. I think the .25 LAs would be fine, unless I lost one. I don't think they could pull 7 lbs each though. Thoughts?
They quit making the 40LAs right?
I am strongly leaning toward the TT .36. I like TT and I believe they share some common engineering with OS.
I am still going to look into the .46LAs before I make a choice.
I wish I could find 4 NIB .25FXs! That would make this choice so much easier!
Thanks everyone for your help. Keep voting!
11-27-2009, 02:10 PM
#17
RE: .25-.32 2 stroke engine choice
Not to complicate things, but the TT 42 is very reliable, with as good or better power compared to the 46 LA, and no rear-mounted needle. It weighs about 12 ozs, which puts it in the same league, weight wise, with a lot of .25 - .36 size engines, but it will be very happy on an 11 inch prop. Radical RC is a good place to get them. Jim
11-27-2009, 03:34 PM
#19
RE: .25-.32 2 stroke engine choice
ORIGINAL: Ed_Moorman
Jeremy,
My flying buddy and I have built and flown 25 twins and a triple in the past 5 years or so (he builds and I fly). We have tried OS, Magnum, GMS, Thunder Tiger, Fox and maybe a couple of others. We ended up flying nearly all OS.
We found that the biggest thing with multi-engine is engine reliability. And believe me, engine reliability on a single does not transfer to a multi. We had 4 GMS .32s and never could keep both running much more than half the time. I never had one quit on a single engine plane, but on a twin, they were terrible. The same goes for Magnum. The .28s were especially bad on a multi. I don't know what it is, but put 2 engines on the same plane and things start happening. Maybe it's fuel foaming, but whatever it is, some engines are worse that others in a twin.
Also, the smaller engines do worst than the larger ones. The .46 size is more reliable than the .25 size. I had GMS .47s in 2 twins. Good engine in a single. Just not 95% reliable in a twin. I bought 4 OS .46AXs and just flew and flew, no problem.
After trying Magnum .28s and GMS .32s in 3 planes, I gave up. OS .25FXs run perfect. Mine are now on a modified to a twin, Diamond Dust delta. They have Jett tuned mufflers. It goes like all get out and is totally reliable.
Don't knock the LA engines too much. Yes, they are lower power, but they do keep running. We have used OS .40LA, .46LA and .65LA in twins. The 2 LA .40s were in a swept wing canard. A fellow club member just had to have it, so we sold it, but we never had an engine failure.
If you don't think the .25LAs will be enough for your C-130, try the .46LA. They weigh only an ounce and a half more than the .25FX and actually weigh a couple of tenths of an ounce less than the .25 or .32 AX!!! We used to say that the OS .40FP was the best .25 engine made. The LA .40 or .46 will pull a .25 sized plane nicely at a lower cost and no more weight than a ball bearing .32.
Jeremy,
My flying buddy and I have built and flown 25 twins and a triple in the past 5 years or so (he builds and I fly). We have tried OS, Magnum, GMS, Thunder Tiger, Fox and maybe a couple of others. We ended up flying nearly all OS.
We found that the biggest thing with multi-engine is engine reliability. And believe me, engine reliability on a single does not transfer to a multi. We had 4 GMS .32s and never could keep both running much more than half the time. I never had one quit on a single engine plane, but on a twin, they were terrible. The same goes for Magnum. The .28s were especially bad on a multi. I don't know what it is, but put 2 engines on the same plane and things start happening. Maybe it's fuel foaming, but whatever it is, some engines are worse that others in a twin.
Also, the smaller engines do worst than the larger ones. The .46 size is more reliable than the .25 size. I had GMS .47s in 2 twins. Good engine in a single. Just not 95% reliable in a twin. I bought 4 OS .46AXs and just flew and flew, no problem.
After trying Magnum .28s and GMS .32s in 3 planes, I gave up. OS .25FXs run perfect. Mine are now on a modified to a twin, Diamond Dust delta. They have Jett tuned mufflers. It goes like all get out and is totally reliable.
Don't knock the LA engines too much. Yes, they are lower power, but they do keep running. We have used OS .40LA, .46LA and .65LA in twins. The 2 LA .40s were in a swept wing canard. A fellow club member just had to have it, so we sold it, but we never had an engine failure.
If you don't think the .25LAs will be enough for your C-130, try the .46LA. They weigh only an ounce and a half more than the .25FX and actually weigh a couple of tenths of an ounce less than the .25 or .32 AX!!! We used to say that the OS .40FP was the best .25 engine made. The LA .40 or .46 will pull a .25 sized plane nicely at a lower cost and no more weight than a ball bearing .32.
[sm=thumbup.gif] +1 on consistancy, the OS engines will run "out the box".
11-27-2009, 04:27 PM
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RE: .25-.32 2 stroke engine choice
ORIGINAL: r2champion
I will also recommend the TT Pro 36's. Great power and reliable.
I will also recommend the TT Pro 36's. Great power and reliable.
11-27-2009, 04:31 PM
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RE: .25-.32 2 stroke engine choice
A poll like this seems like a good way to get all the stories about how a particular engine is the best there is because it was cheaper than something else and it starts..
11-27-2009, 06:22 PM
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RE: .25-.32 2 stroke engine choice
ORIGINAL: MJD
And they have sporadic carburetor problems and I would never use one on a multi. I would call that ''cheaping out'' at the risk of reliability. Not to insult the engines (or you !), but this is known and I've been helping someone with one recently. Some have problems flowing enough fuel at WOT, others have leaks. Some have both (bonus). The rest of the engine seems great, runs like a bear. Pop a Perry carb on a pair and then I'd think about it.
With multis go with well-known engines with consistent properties. If you're trying to save money, build a single. Within reason of course, but I just mean you can't tolerate certain things with multis and should not force yourself to by gambling on engines.
MJD
ORIGINAL: jimmyjames213
if you arnt in a hurry i have had great luck with my gms engines (.47 .32 and the th .46). the .32 i have is very reliable and powerful. not to menton cheap. sometimes th will get the engines in earlier than expected, sometimes later. if you are just starting your build i would wait a little while and see if anything new comes out or the engines go on sale.
if you arnt in a hurry i have had great luck with my gms engines (.47 .32 and the th .46). the .32 i have is very reliable and powerful. not to menton cheap. sometimes th will get the engines in earlier than expected, sometimes later. if you are just starting your build i would wait a little while and see if anything new comes out or the engines go on sale.
!), but this is known and I've been helping someone with one recently. Some have problems flowing enough fuel at WOT, others have leaks. Some have both (bonus). The rest of the engine seems great, runs like a bear. Pop a Perry carb on a pair and then I'd think about it.With multis go with well-known engines with consistent properties. If you're trying to save money, build a single. Within reason of course, but I just mean you can't tolerate certain things with multis and should not force yourself to by gambling on engines.
MJD
as for the other comment about the os .40fp being the best .25 ever made..........so true. turns a big prop though (mine is throwing a APC 12X4 in the 10 grand range and not complaining to much)
ever thought about putting 4 storokes on the plane??? OS or magnum .30's? or magnum .52's if you can take the weight (16 oz)
could go saito and save more weight.....but it gets really expensive
btw the ax25 and ax.35 cost the same as the .25 and weights the same (.2 oz diff).
