*** Ultra Sport Brotherhood ***
#2506
The only problem I would have with putting larger glow engines like that would be the cost of the glow fuel. I run 15% fuel at and around $20/gallon it can run into some money in a hurry running a large glow engine. That's one reason why I've started going with gas engines in anything larger than a 90-sized 4 stroke any more. As I said earlier, I think this is one of the reasons that they US 1000 never really was as popular as the two smaller versions. The bigger glow engines just cost too much to run.
Now on the other hand, the two engines that you mention would be sweet on the front of a US 1000!!!
Ken
Now on the other hand, the two engines that you mention would be sweet on the front of a US 1000!!!
Ken
#2511
My Feedback: (551)
The only problem I would have with putting larger glow engines like that would be the cost of the glow fuel. I run 15% fuel at and around $20/gallon it can run into some money in a hurry running a large glow engine. That's one reason why I've started going with gas engines in anything larger than a 90-sized 4 stroke any more. As I said earlier, I think this is one of the reasons that they US 1000 never really was as popular as the two smaller versions. The bigger glow engines just cost too much to run.
Ken
Ken
Jim
Last edited by jrf; 11-18-2014 at 03:35 PM.
#2513
I hear this argument all the time from people who have no experience with large glow engines. I run a Moki 210, a Moki 180 and a couple of OS 160s. All of them will run on zero nitro (FAI) fuel. I run them on 5% because they idle a little more consistently on that. But any higher nitro is a total waste of money on these engines. I buy 5% Omega in a four gallon case for $13 a gallon and a case will last me 6 months to a year. Yes, a big engine will go through a lot of fuel at full throttle, but who flies those at full throttle all the time. With normal throttle control, a 10 minute aerobatic (not 3D) flight with a Moki 180 will burn about 8 oz of fuel. At $13 a gallon, that is about 80 cents a flight. Round that up and ask yourself if $1.00 per flight is too much for Moki type performance.
Jim
Jim
You are absolutely correct, and I'm not arguing your point. I run 15% fuel simply because that is what I started with when I was flying smaller .46-.60 sized planes, and that's what I fly now so simply stick with it as I still have several planes that I fly with those size engines in them. I like the way they run with the 15% in them so I stick to it. I know that I could go to a lower nitro level and still be ok, but I choose not to. But if you re-read the post you quoted you will see that I said that I run 15% and it costs $20/gallon. That's my cost and that was my experiences. However, using your costs of just $13/gallon for fuel it's still more expensive than a gallon of gasoline and around $3/gallon at today's prices. And that is the case that I am making here in why I think the US 1000 never really caught on really big. If we had the cheap gas engines back when the US 1000 first came out I think that the US 1000 would have been much more popular. Those big glow engines are what held back the US 1000, in my opinion.
Ken
#2514
My Feedback: (551)
Ken:
I run 15% in my 40-60 size engines also. And yes, running gas is generally cheaper than running glow in the same size airplane. (At least it is after you amortize the added up-front cost of the gas engine.) I'm just saying that the cost of glow fuel for the big engines is not as bad as people seem to think it is. And you can get outstanding performance from an Ultra Sport 1000 with a big glow engine at a reasonable cost.
As far as the reasons that the 1000 wasn't as popular as the 60, I'm sure engine and fuel costs held a lot of people back. Retracts for a 12-13 pound airplane are not cheap either. And don't discount the one-piece wing. A lot of folks can't transport or store a wing that size. Giant airplanes are not for everybody.
Jim
I run 15% in my 40-60 size engines also. And yes, running gas is generally cheaper than running glow in the same size airplane. (At least it is after you amortize the added up-front cost of the gas engine.) I'm just saying that the cost of glow fuel for the big engines is not as bad as people seem to think it is. And you can get outstanding performance from an Ultra Sport 1000 with a big glow engine at a reasonable cost.
As far as the reasons that the 1000 wasn't as popular as the 60, I'm sure engine and fuel costs held a lot of people back. Retracts for a 12-13 pound airplane are not cheap either. And don't discount the one-piece wing. A lot of folks can't transport or store a wing that size. Giant airplanes are not for everybody.
Jim
Last edited by jrf; 11-19-2014 at 09:57 AM.
#2517
Originally the US 1000 didn't allow for a retract setup with a nose wheel because with a glow engine the fuel tank needed to be right behind the fuel tank. But with a gas engine we can move the fuel tank back inside the fuselage (I'm moving to directly above the CG) so that I have now have room behind the firewall for a retract gear to go in. We're going with a 100 degree nose gear that has the nose wheel raked just a little bit forward giving it a look like a fighter jet. Should look pretty cool!!!
As I get a little bit caught up in some other thinks that I have going on I plan to start up a build thread on this US 1000 build, so please don't yell at me for one!!!!
Ken
#2518
My Feedback: (551)
I have tried the 135/140 Mokis, and unfortunately they have not been as good as the bigger Mokis. I do not recommend them. Check EBAY for a good used OS 120 AX or 160 FX. I had a 1000 with an Italian made Super Tigre 2300 (1.40) and it was awesome. More power than I could use, but not as reliable as an OS.
Jim
#2519
Banned
No reason given ?
stoner:
The Moki 180 is a lot bigger and heavier than a 120 or even the OS 160, and you can't really use the extra power in an Ultra Sport 1000 unless you want to go 150 mph, and that gets old after a while.
I have tried the 135/140 Mokis, and unfortunately they have not been as good as the bigger Mokis. I do not recommend them. Check EBAY for a good used OS 120 AX or 160 FX. I had a 1000 with an Italian made Super Tigre 2300 (1.40) and it was awesome. More power than I could use, but not as reliable as an OS.
NOTE .... blue above highlighted by Zor.
Jim
I am interested in the reason(s) why a Super Tigre 2300 (1.40) is not as reliable as an OS ( in your statement ) ..... ( opinion ? ).
Your explanations would be well appreciated.
Althoug I bought an OS 55 AX for my Kadet Senior, the mods I am doing and reinforcements will make it quite a bit heavier and if the OS is overloaded I may use my nearly new Super Tigre G 90 .
Zor
Last edited by Zor; 11-19-2014 at 12:26 PM.
#2521
Join Date: Jun 2003
Location: Chesterton, IN
Posts: 44
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#2522
My Feedback: (551)
Zor:
My experience is all with the Italian Super Tigers. Never tried one of the Chinese ones. I found it very difficult to make the 2300 ST carb work. We used to have an expert ST tuner here but he was not very available, so I installed a Perry carb. Much better, but it would still dead stick occasionally for no good reason. I've never had that problem with OS, and never had to change the carb.
I have also had an ST 90 or two. (I've been in this hobby for 35 years.) The carbs seemed easier to use on those, but boy, do they vibrate! I always balance my props, but I was tempted to unbalance the prop on those to counteract their inherent vibration.
Try a 13x4w apc on the 55. You won't believe the pull you get from that prop.
Jim
My experience is all with the Italian Super Tigers. Never tried one of the Chinese ones. I found it very difficult to make the 2300 ST carb work. We used to have an expert ST tuner here but he was not very available, so I installed a Perry carb. Much better, but it would still dead stick occasionally for no good reason. I've never had that problem with OS, and never had to change the carb.
I have also had an ST 90 or two. (I've been in this hobby for 35 years.) The carbs seemed easier to use on those, but boy, do they vibrate! I always balance my props, but I was tempted to unbalance the prop on those to counteract their inherent vibration.
Try a 13x4w apc on the 55. You won't believe the pull you get from that prop.
Jim
#2523
My Feedback: (17)
Join Date: Sep 2002
Location: Nokomis FL
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My US 1000 also has a ST 2300 - Italian, bought used for $28.00. Running an APC 16x8 on 5% fuel and a Perry pump carb (but without pump), I have unlimited vertical. I use a hot plug, like an "F" or "Miracle" and don't have any issues with dead sticks. No problems with fuel draw, even with the huge carb and a Pitts muffler with both tubes open. Sure is fun!
Jim
Jim
#2524
Banned
About Super Tigres
Zor:
My experience is all with the Italian Super Tigers. Never tried one of the Chinese ones. I found it very difficult to make the 2300 ST carb work. We used to have an expert ST tuner here but he was not very available, so I installed a Perry carb. Much better, but it would still dead stick occasionally for no good reason. I've never had that problem with OS, and never had to change the carb.
I have also had an ST 90 or two. (I've been in this hobby for 35 years.) The carbs seemed easier to use on those, but boy, do they vibrate! I always balance my props, but I was tempted to unbalance the prop on those to counteract their inherent vibration.
Try a 13x4w apc on the 55. You won't believe the pull you get from that prop.
Jim
I understand your experience with the Super Tigre engines.
I also had some carburetor problems but solved it.
I cannot tell where my G 90 was manufactured. Initially I experienced transition problems from idle to max power. I said to myself that the piston-cylinder is nothing but a compression chamber so I took the carburetor apart. I found that the opening where the fuel is drawn into the engine referred to as "the cat's eye" was not deburred cleanly and actually a couple of burrs were loose in there.
I prceeded to clean this up and polish the cat's eye opening. No more difficulty to adjust the fuel ratio and bench tests proved the problem had disappeared.
It worked fine on my Super Skybolt untill I decided to replace it with a Saito 125a.
Thanks for the advice about the OS 55 AX and the prop. I am on schedule to start building my Kadet Senior in early December.
Zor