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A bit dissappointed - 10/18/2010 7:10 AM   
flybyjohn


 

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From: Helena, MT, USA
Status: offline 		I just checked the RPM of my magnum 53 2s (The older engine) against the thunder tiger 46 pro (the older one with straight needle) and the TT won by 200 RPM with each type of prop tested. I only checked one pitch, 11x6, in the Master Airscrew S-2, APC, and wood zinger. I also put the tower muffler on the TT after running it with the stock muffler and did not get any increase of RPM with it. That surprised me after hearing most people pick up some RPM with it. The other thing that surprised me is that after hearing alot of people saying APC was one of the best props, it was 900 RPM slower than the S-2. I did not check the thrust so perhaps the APC was giving more thrust than the S-2.

Here are the results:
all 11x6 props
Master Airscrew S-2 / APC / Wood Zinger
Magnum53 12500 / 11600 / 11400
TT pro46 12700 / 11800 / 11600
TT pro46 W/
Tower muff. / 11800/

Note that the MA S-2 did get the most RPM however it had the most vibration of them all. I had it balanced the best I could get it but the hole is not quite in the center of the hub.

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RE: A bit dissappointed - 10/18/2010 7:16 AM   
w8ye



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Status: offline 		The 53 was not a successful engine


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RE: A bit dissappointed - 10/18/2010 7:18 AM   
flybyjohn


 

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Status: offline 		Yep, thats what I have been reading about. When I bought it, it had a lot of advertising hoopla about nearly 60 size power in a 40 size case. I guess those power figures were not tested.

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RE: A bit dissappointed - 10/18/2010 7:20 AM   
flybyjohn


 

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Status: offline 		I had this engine in my RC Nobler, cleaned it up and was going to get the Nobler back in the air but now I think I am going to put the TT pro 46 in it. The carb is a little better on it.

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RE: A bit dissappointed - 10/18/2010 7:36 AM   
w8ye



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Status: offline 		The Thunder Tiger 46 is a standard of comparison in two stroke 46 size model engines. You will enjoy.


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RE: A bit dissappointed - 10/18/2010 7:43 AM   
djlyon



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Status: offline 		My 53 was a very nice engine, good idle good transition and steady top end. It just didn't have any more power than a mediocre 40. But it never quit in flight, even I think when it ran out of fuel. It was on the front of a Taquela Sunrise and knew what would happen if it quit Return to earth like a rock

Denis

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RE: A bit dissappointed - 10/18/2010 8:20 AM   
flybyjohn


 

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Status: offline 		Thanks for the comments guys. What can you tell me about the props. Are my findings realetivly acurate with what you more experienced modelers have found. 11x6 is what prop I was planing to use on this plane and I kind of wanted to go with plastic becuase the clearance is not so good when the tail is up and I have had better experiences with plastic just touching the runway than wood. Which prop would you choose, APC or MAS S-2

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RE: A bit dissappointed - 10/18/2010 8:24 AM   
w8ye



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Status: offline 		Props are a personal thing. You need to try them both and see which one you like best?

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RE: A bit dissappointed - 10/18/2010 1:43 PM   
Harry Lagman


 

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quote:

ORIGINAL: flybyjohn

Thanks for the comments guys. What can you tell me about the props. Are my findings realetivly acurate with what you more experienced modelers have found. 11x6 is what prop I was planing to use on this plane and I kind of wanted to go with plastic becuase the clearance is not so good when the tail is up and I have had better experiences with plastic just touching the runway than wood. Which prop would you choose, APC or MAS S-2


The short answer: Of the two plastics props, you'll need to fly the model with both, flying your normal rountines, to find out which is best.

Re: the rpm numbers. I have not seen the old Magnum .53 you have in the field so I can't comment on the numbers you are getting. I've seen the TT .46 Pro deliver from 11,500 to 12,200 on the APC 11 x 6 so your number is absolutely in the middle of the ballpark.

The longer answer: Your results directly co-relate to mine when comparing the props. The MA 11 x 6 is more like an 11 x 5. It loads less than the APC on the ground, as you've seen. I've seen even bigger differences in the RPM between the two on the ground than you've reported. The MA 11 x 6 will unload a lot more once in the air than the APC when on the same model. I've flown the same model with both props on several occasions and have noticed this aspect every time.

It's like the pitch is at least 1" more on the APC (or indeed 1" less on the MA) - it's quite noticeable.

You'll have to try out both in the air for your model/engine combo. If your model requires a finer pitch than the APC 11 x 6, the MA could be a good substitute.

Every in-flight comparison I've made so far where both of these props were tried, the APC performed materially better at lower rpm with less prop noise in a variety of applications.

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RE: A bit dissappointed - 10/18/2010 11:00 PM   
Sport_Pilot



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Engine speed on the ground is not a good way to compare props.  To do that correctly you would need a wind tunnel, pitot tubes to measure incoming and outgoing velocity, a thrust scale, a dynometer to measure engine torque, as well as engine RPM.  To have a lower RPM may only mean that one prop had more pitch or area.  It says nothing about the performance of the prop.

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RE: A bit dissappointed - 10/18/2010 11:33 PM   
jaka


 

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From: Upplands Vasby, SWEDEN
Status: offline 		Hi!
The TT .40 PRO SE and -46 PRO SE are some of the best sport engines today. The proof of that is The TT .40 is used as a standard engine in the 424 class of Q-500 racing in the US.

Just because a certain prop turns more rpm than another doesn't mean it is "better" (performs better in the air ) than the slow rewing prop.

I have been in this hobby/sport for 35 years and have tested many props as I'm a pylon racer at heart, and as such need to know what works and what does not!
I can say from personal experience that the best props today for general sportflying (and some slower flying Q-500 racing) are APC, RAM and Graupnert Cam-props (those with upswept tips).
Unfortunatly MA or all wood props doesn't come close to these.

Props are no personal thing as some say, as there is always a prop that will work best for a certain plane /engine combination.

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RE: A bit dissappointed - 10/20/2010 2:46 AM   
earlwb


 

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Status: offline 		On many of the bored out 40 size engines, where they bored them out more than a .45 displacement, they run into internal flow problems. as the bore gets larger it cuts into and reduces the sizes of the transfer ports leading to the combustion chamber. so the engine winds up being starved at higher RPMs. But on the other hand, the big bore 50's or larger tend to turn a larger prop than the .45's can. so you can go to a larger prop and the .53 will likely turn it better than the .45 can. it might work with a 11x7 or 12x5 or prop. But hard to say, it might have still been a bad design though.




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RE: A bit dissappointed - 10/20/2010 5:27 AM   
blw



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quote:

ORIGINAL: jaka

Props are no personal thing as some say, as there is always a prop that will work best for a certain plane /engine combination.


I understand what you are getting at, but it should read certain plane/engine combination/desired purpose. A pylon prop would fly crappy on the same model if flying pattern.

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RE: A bit dissappointed - 10/20/2010 5:42 PM   
NM2K


 

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quote:

ORIGINAL: flybyjohn

I had this engine in my RC Nobler, cleaned it up and was going to get the Nobler back in the air but now I think I am going to put the TT pro 46 in it. The carb is a little better on it.




Try flying the Nobler with the Magnum .53 while spinning a Rev-up 11x7.5 or an APC 11x8, if you can find one. Give it ten or so flights for you to get used to the sound of the engine working a little harder. Then tell us what you think. Afterwards, replace the Magnum .53 with the TT .46 Pro using the same prop and then later with an 11x6 prop, or, my favorite props for pattern-type flying with this engine, a 10x6 or 7 APC (it minimizes the torque roll effect versus using the 11x6 or 7).


Ed Cregger


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