Input on engine selection
06-13-2006 | 10:34 PM
#1
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From: Lakeland,
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Input on engine selection
I'm building a Hangar 9 .60 size P47 and need some feedback on the engine for this plane. I was going to put a OS .61FX in it, but I needed it for another plane that is already built. I am torn between the Tower Hobbies .75, the Evolution .61NT, and the Evolution 1.00NX. I have even considered an OS .65LA, but I feel that it might be a little under powered. I am also on a budget, sotthe engine can't cost much more than $170.00. Thanks in advance for the input.
06-13-2006 | 11:14 PM
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From: Mira Mesa, CA
RE: Input on engine selection
Hmmm... This could be a bit tricky. The OS-61FX and 65LA are VERY close in power output- I really like my Tower-75 not sure how it runs on a Pitts style muffler (I assume you want an in-cowl exhaust? I would suggest the Supertigre G90, it is inexpensive, runs well in different exhaust systems and is pretty powerful for its' size.
I am not familiar with the Evolution--
Other folks are going to ignore your budget comment and suggest 4 strokes I bet though...
I am not familiar with the Evolution--
Other folks are going to ignore your budget comment and suggest 4 strokes I bet though...
06-14-2006 | 12:45 AM
#3
RE: Input on engine selection
I've heard really good things about Evolution engines. I'd go with the Evo 1.00. It's the size of a .90 and has more power.
If you want a 4-stroke in that price range, you CAN buy the O.S. FL-70 or Magnum .70. The O.S. is quieter, the Magnum more powerful. Both can turn a 14X6 prop, which will make your warbird soar.
If you want a 4-stroke in that price range, you CAN buy the O.S. FL-70 or Magnum .70. The O.S. is quieter, the Magnum more powerful. Both can turn a 14X6 prop, which will make your warbird soar.
06-14-2006 | 07:32 AM
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From: Lakeland,
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RE: Input on engine selection
Thanks for the input. I'm leaning more towards the Tower .75 right now with the Evolution 1.00 running a close second...the only thing turning me off of the evo are the ratings here on RCU. I'm not planning on using a pitts muffler, simpling drilling a hole in the firewall and fuse to route the muffler and exhaust out [link=http://www.rcgroups.com/articles/rcpowermag/2006/jan/p47/muffler_hole_2_edited.jpg]Like This.[/link]
06-14-2006 | 01:05 PM
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RE: Input on engine selection
Go with the TH .75. I am 100% satisfied with mine so far. With over 3-1/2 gallons through it, with not one dead stick "knock on wood" and still on the same #8 plug that I broke it in with. I am running a Bisson pitts made for the TH .75/GMS .76, and have had absoulutly no issues what so ever with this engine. I would not hesitate one bit to buy another.
Currently I am turning an APC 12-8 @ 11,400 richened for flight. The performance of my 7-1/2lb Shoestring has with this combo is quite spectacular.
Just the other day, I fellow at the field asked if I had stuffed a 1.20 in the plane, when I turned to him and told him it was a $90.00 TH .75, he just shook his head and walked back towards his plane.
Currently I am turning an APC 12-8 @ 11,400 richened for flight. The performance of my 7-1/2lb Shoestring has with this combo is quite spectacular.
Just the other day, I fellow at the field asked if I had stuffed a 1.20 in the plane, when I turned to him and told him it was a $90.00 TH .75, he just shook his head and walked back towards his plane.
It is very hard to beat the Tower .75 @ $90.00.
06-14-2006 | 04:08 PM
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From: Bruce,
MS
RE: Input on engine selection
Just traded a 61FX for a Tower 75 and won't go back to OS. The 75 is more powerful and about half the price. It will swing a 13X6 aboout like the OS would swing a 11X6.
06-14-2006 | 04:56 PM
#10
RE: Input on engine selection
My friend just built this plane with a Saito 100 and it's tail heavy as hell. He built it stock and argued with me about the Saito 100. I told him to put a 120 in it, and he wanted to put a Saito 72 in it. He finally "compromised" with me and bought the 100. Now he realizes that he should have listened to me in the first place and got the 120. Took 8.5oz of lead on the firewall to balance it with the Saito 100.
If I was you, I'd build the plane and then figure out how much weight it takes to balance it. Buy an engine that weighs enough to balance it.
I have several of the TH .75 engines. I love them. Good power. Good price. Good reliability.
Is it heavy enough to balance this plane? NO
If I was you, I'd build the plane and then figure out how much weight it takes to balance it. Buy an engine that weighs enough to balance it.
I have several of the TH .75 engines. I love them. Good power. Good price. Good reliability.
Is it heavy enough to balance this plane? NO
06-14-2006 | 05:27 PM
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From: Lakeland,
FL
RE: Input on engine selection
RCpilet
Forget budget constraints and how you actually want the plane to fly and throw on whichever engine balances the plane?... find me a Saito 1.20 for less than $170.00 and I'll consider it, until then I'll probably go with a Tower .75 or ST g75 or g90 and a little lead. Thanks for the input, though.
Forget budget constraints and how you actually want the plane to fly and throw on whichever engine balances the plane?... find me a Saito 1.20 for less than $170.00 and I'll consider it, until then I'll probably go with a Tower .75 or ST g75 or g90 and a little lead. Thanks for the input, though.
06-14-2006 | 06:16 PM
#13
RE: Input on engine selection
I'd much rather put HP on the firewall to make the plane balance. I will not use lead.
Why would you put a ST90 or a TH 75 on the firewall and then add 6 or 7oz of lead? Get a heavier engine.
How is that going to effect the way the plane flies? Same weight. Weather you put on a light engine and lead, or put on a heavier engine and no lead. Both combinations will weigh the same. But a heavier engine will at least pull it's own weight. Asking a lighter engine to pull it's own weight AND lead is not the best thing to do. Not to me, anyways.
It doesn't have to be a Saito engine. I know they are expensive. You can get a ST2300 for $150. GMS 120 for $130.
Put on a bigger engine to balance it and then use a 3-blade prop for cool factor. It is a warbird. An underpowered warbird will not be much fun, so I'd buy the big motor to balance it and then slap a 3-blade or 4-blade prop on it. High Speed Scrafing Runs [sm=thumbup.gif]
Why would you put a ST90 or a TH 75 on the firewall and then add 6 or 7oz of lead? Get a heavier engine.
How is that going to effect the way the plane flies? Same weight. Weather you put on a light engine and lead, or put on a heavier engine and no lead. Both combinations will weigh the same. But a heavier engine will at least pull it's own weight. Asking a lighter engine to pull it's own weight AND lead is not the best thing to do. Not to me, anyways.
It doesn't have to be a Saito engine. I know they are expensive. You can get a ST2300 for $150. GMS 120 for $130.
Put on a bigger engine to balance it and then use a 3-blade prop for cool factor. It is a warbird. An underpowered warbird will not be much fun, so I'd buy the big motor to balance it and then slap a 3-blade or 4-blade prop on it. High Speed Scrafing Runs [sm=thumbup.gif]
06-14-2006 | 06:36 PM
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RE: Input on engine selection
ORIGINAL: Rcpilet
I'd much rather put HP on the firewall to make the plane balance. I will not use lead.
Why would you put a ST90 or a TH 75 on the firewall and then add 6 or 7oz of lead? Get a heavier engine.
How is that going to effect the way the plane flies? Same weight. Weather you put on a light engine and lead, or put on a heavier engine and no lead. Both combinations will weigh the same. But a heavier engine will at least pull it's own weight. Asking a lighter engine to pull it's own weight AND lead is not the best thing to do. Not to me, anyways.
It doesn't have to be a Saito engine. I know they are expensive. You can get a ST2300 for $150. GMS 120 for $130.
Put on a bigger engine to balance it and then use a 3-blade prop for cool factor. It is a warbird. An underpowered warbird will not be much fun, so I'd buy the big motor to balance it and then slap a 3-blade or 4-blade prop on it. High Speed Scrafing Runs [sm=thumbup.gif]
I'd much rather put HP on the firewall to make the plane balance. I will not use lead.
Why would you put a ST90 or a TH 75 on the firewall and then add 6 or 7oz of lead? Get a heavier engine.
How is that going to effect the way the plane flies? Same weight. Weather you put on a light engine and lead, or put on a heavier engine and no lead. Both combinations will weigh the same. But a heavier engine will at least pull it's own weight. Asking a lighter engine to pull it's own weight AND lead is not the best thing to do. Not to me, anyways.
It doesn't have to be a Saito engine. I know they are expensive. You can get a ST2300 for $150. GMS 120 for $130.
Put on a bigger engine to balance it and then use a 3-blade prop for cool factor. It is a warbird. An underpowered warbird will not be much fun, so I'd buy the big motor to balance it and then slap a 3-blade or 4-blade prop on it. High Speed Scrafing Runs [sm=thumbup.gif]
------------------
Boy, talk about overpowered with the G2300. I love that engine, myself. The more you run them, the better they get. However, tripling (nearly) the recommended displacement (assuming .60 is the upper limit) is going to take some fancy piloting to keep it from rolling over due to torque when you goose it.
I'm with you. I'd rather carry more engine than extra lead weight, most of the time.
I've never ran an Evolution engine, so I'm still a little leary of them. I have seen some good reviews of them.
06-14-2006 | 06:37 PM
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From: Mira Mesa, CA
RE: Input on engine selection
ST2300, given the apparent tail heavy issues- there is no substitute for displacement... Magnum now makes a 1.20 I believe not sure of the price tag on that one.
An underpowered warbird is, in my opinion, one of the most difficult RC airplanes to fly. And the "Jugs" is no exception- it is fat and needs a bit more power than suspected by many... Get at minimum a .90 (ST) up to 1.20 2 stroke, this will help the balance issue and give you power in case you need it -
I love my Tower-75 but for a 60 sized WWII airplane? Nope...
An underpowered warbird is, in my opinion, one of the most difficult RC airplanes to fly. And the "Jugs" is no exception- it is fat and needs a bit more power than suspected by many... Get at minimum a .90 (ST) up to 1.20 2 stroke, this will help the balance issue and give you power in case you need it -
I love my Tower-75 but for a 60 sized WWII airplane? Nope...
06-14-2006 | 07:05 PM
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From: Lakeland,
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RE: Input on engine selection
rcpilet
I see your point when you list examples that I can use. I don't want to add dead weight and I do want the plane to have a good powerplant, but I just couldn't justify going that far overbudget to balance the plane...thanks again for giving more info (I still think a g2300 is a bit much, though) [sm=wink.gif]
I see your point when you list examples that I can use. I don't want to add dead weight and I do want the plane to have a good powerplant, but I just couldn't justify going that far overbudget to balance the plane...thanks again for giving more info (I still think a g2300 is a bit much, though) [sm=wink.gif]
06-14-2006 | 07:08 PM
#17
RE: Input on engine selection
ORIGINAL: Razor-RCU
I love my Tower-75 but for a 60 sized WWII airplane? Nope...
I love my Tower-75 but for a 60 sized WWII airplane? Nope...
To me--warbirds and aerobatic planes fall bascially into the same power category. You need lots of it. If your not used to flying an airplane with rediculous torque issues--then stay under the porch with the rest of the guys flying trainers and Cubs.
There's no bigger sin than building an anemic aerobat. There's no bigger sin than building an anemic warbird. Those two are the cardinal sins of model aviation.
When it comes to power on a warbird or aerobat--go big or go home. [>:]
No one wants to see a 30lb Mustang that can't even pull a loop. [sm=lol.gif]
06-15-2006 | 07:08 AM
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From: Lakeland,
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RE: Input on engine selection
I just wanted to thank everyone for their suggestions. While I've heard a lot of good things about the Towers .75 and will consider it for my next plane, I think I'm going to go with the Super Tigre G90. I think it should be a good balance of power, weight, and price. Now I just hope I can tune the damned thing
06-15-2006 | 07:23 AM
#19
RE: Input on engine selection
Is it heavy enough to balance this plane? NO
06-15-2006 | 09:52 PM
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From: Lakeland,
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RE: Input on engine selection
Ok, I know this is stupid, but I started a poll [link=http://www.rcuniverse.com/forum/m_4395772/anchors_4395772/mpage_1/key_/anchor/tm.htm#4395772]HERE[/link] I would appreciate if we could continue this thread at the link provided so I could get a better idea of what people think of the engines I have limited it to.
Thanks,
Dave
Thanks,
Dave
