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Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 9:42:54 AM   
Dauntae



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From: New Bedford, MA, USA
Status: offline 		I picked one of these up for a toss in the car for a quick flight plane but need an engine, I orriginally planned on a 46 but it's against my religion to put a 2 stroke on a bipe (my 4th bipe and still have 3 with this one) would a 56 fly this good, I am considering a ASP 61 actually but don't want to come up short on power. a cheaper 70 4-stroke would be too heavy and I don't want to spend the money for a Saito 72 with it's light weight for a toss around beater plane like this. What do you guys think? The ASP is 444gr so it won't be too bad for weight.

Thanks for any input
Dauntae

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 10:28:39 AM   
Ed Cregger



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From: Ringgold, GA, USA
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quote:

ORIGINAL: Dauntae

I picked one of these up for a toss in the car for a quick flight plane but need an engine, I orriginally planned on a 46 but it's against my religion to put a 2 stroke on a bipe (my 4th bipe and still have 3 with this one) would a 56 fly this good, I am considering a ASP 61 actually but don't want to come up short on power. a cheaper 70 4-stroke would be too heavy and I don't want to spend the money for a Saito 72 with it's light weight for a toss around beater plane like this. What do you guys think? The ASP is 444gr so it won't be too bad for weight.

Thanks for any input
Dauntae



----------------


There is a real good chance that you are going to have to add nose weight in order to get it to balance properly. After all, it is a biplane and that's what they do. The .70 might not even be enough weight.

My Global Ultimate 40 ARF's plans calls for using a Magnum .91 in order to balance it just right. Folks say that the Magnum .91 is the perfect engine for this model.


Ed Cregger



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RE: Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 4:19:00 PM   
Flyboy Dave



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From: San Bernardino County, CA, USA
Status: offline 		Ed....I use the Magnum .91 four stroke motors in 45 size planes all the time, I even have
a 45 size Mustang with a YS .91 supercharged in it...but when you tell folks that, the......

...."It is overpowered, and it won't fly scale" crowd comes along.

"Fly scale" means the plane is so underpowered it woun't even do a decent loop. I have a buddy
with a 40-45 size Ultimate bipe....has put a new Magnum .60 four stroke in it. It was such a dog
he pulled his new pride and joy engine out of the plane, and put a K&B .61 in it. The K&B is
fairly light and had the perfect amount of power. A nice running 70 might have been OK.

Here's four of my planes....45 size, with .91's in them.

FBD.

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 7:21:58 PM   
chevy43


 

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Status: offline 		FBD,
Is that the Strega .40 on the right?

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 8:19:12 PM   
Ed Cregger



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From: Ringgold, GA, USA
Status: offline 		I'm with you, Dave, on the "fly scale" comments. If I really cared about scale, I would be flying the full size airplane and not a model of it.

Underpowered models are no fun to fly. They are a crash looking for a place to happen as far as I'm concerned. But, to each his own...<G>

I like all of the Magnum engines that I own/have owned, but to me, it is a toss up between the .91 and .52/.61 four-strokes as to which is best of the Magnum four-stroke line. I tend to lean more toward the .91 four-stroke. I haven't owned all of the Magnum engines, so I can't say positively that the .91 4-C is absolutely the best Magnum, but I'll bet that it is.

Why anyone would buy the OS or Magnum .70 is beyond me. It weighs within an ounce and a half of their .91 and is virtually the same size. Of course, if one is flying Cub-like models, it doesn't make much of a difference, I suppose.

You have some handsome models there, Dave.


Ed Cregger


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RE: Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 8:35:19 PM   
asmund


 

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Status: offline 		He he Some is even buying the 80, it is like a weak 91 Exactly the same weight and physical size costs within a few dollars less

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 8:44:04 PM   
Sport_Pilot



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Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		Only the radial engine biplane's have a tendancy to be tail heavy, that is because the original engine was not very long and concentrated the weight in one spot. The plane in my avitar is typical. Since a biplane is usually shorter, there is also not as much opportunity to save weight in the tail. A .70 should be plenty of power in this small 42 inch span plane. However it is on the heavy side. Nitroplane kits use too much plywood or something as a lot of them are very heavy, this is not as bad as others.

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/30/2007 10:25:58 PM   
Flyboy Dave



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quote:

ORIGINAL: chevy43

FBD,
Is that the Strega .40 on the right?


....no, it's a World Models Dago Red Mustang with the fiberglass fuselage.

>>Edit......thanks, ED.


< Message edited by Flyboy Dave -- 1/30/2007 10:30:01 PM >

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/31/2007 10:37:36 AM   
Dauntae



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From: New Bedford, MA, USA
Status: offline 		Well it looks like winter will be here for a while so I have time, A friend also got one when I ordered mine and he has the Saito 56 for his (he already had it) so we will see if the CG will be an issue, The plane actually is not too heavy and has a bit of a nose on it and a 91 would definatly not work for this plane, this one is too small. We will check the ballence with the 56 and I'll let you guys know how much we need to add. I just hope the ASP 61 is a good engine, I can't find the 61 under the Magnum label and I too have there 91 and love it.

Dauntae

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/31/2007 12:18:41 PM   
speedster 1919



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From: Martinsville, IN, USA
Status: offline 		Well originally there was a mention of cost. That said the Magnum 70 is on sale at $129.95 and about 1 oz lighter than 91 and smaller case. Should be perfect and it recycles the crancase oil for no mess.

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/31/2007 1:37:27 PM   
Sport_Pilot



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From: Acworth, GA, USA
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quote:

The plane actually is not too heavy


I am only going by what the web site says. It says it is 5.8 pounds, and a wingspan of only 42" That is a bit small for a 40 sized plane but weighs like one.

http://www.nitroplanes.com/pispch4042ar.html

Here is a 30 sized Ultimate. The Ultimate is actually an upgraded Pitts Special. It is about the same size. It has a 42" span and weighs well under 5 lbs.

http://www.airborne-models.com/html/productdetails.asp?ProductID=49

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/31/2007 1:57:13 PM   
speedster 1919



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Status: offline 		Funny the Ultimate is listed as 30 size when starting engine is a 40. Even though a 1/2 narrower wings it has more square area. But the ugly colors

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RE: Engine for Nitro Models .40 size Pitts ARF - 1/31/2007 2:53:12 PM   
Sport_Pilot



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From: Acworth, GA, USA
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quote:

Funny the Ultimate is listed as 30 size when starting engine is a 40
.

? What is a starting engine. The engine size is .32 to .40. The updated version is listed as a 40 size, but actually it flies fine with a .35 sized engine.

http://www.airborne-models.com/html/productdetails.asp?ProductID=84

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RE: Engine for Nitro Models .40 size Pitts ARF - 5/27/2007 11:22:42 AM   
freeonthree



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From: Red Bluff, CA, USA
Status: offline 		I have the Pitts, and I have a Saito 56 on mine. I have 1 1/2 oz's in the rear now, and it seems perfect this way. This little sucker does the boot scootin boogie, but it sure don't like anything below 1/2 throttle. lol Has to come in pretty hot, but that just makes it interesting. The landing gear area of the belly is the weakest area, but some good plywood takes care of that problem. Darn downwind deadstick landings anyway. lol (my fault though)

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RE: Engine for Nitro Models .40 size Pitts ARF - 5/27/2007 6:15:37 PM   
DarZeelon



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