ORIGINAL: rc_wings
Here is a video of the SMP in action. Was recorded on my little point and shoot camera mounted on the rim of an old ball cap...call it the Cap Cam. Was more a test to see how it would work as never seem to have a reliable camera operator handy. Now that I know it works, will try to get some better footage. The SMP is pretty fast, so going to change the prop from a 10x7 to an 11x6 and see how the Tigger .51 handles it and should slow the little Bipe down a bit.
http://www.youtube.com/watch?v=mrKbLFC74_k
Marko
Marko,
I watched the CAPCAM video. It turned out better than I would have imagined. That is cool. Now if you could just setup some kind of zoom control.
Is the spacewalker yours too? [8D]
If you get a chance - try a 12X6 prop on your ST51 and Smith. I am pretty confident you’ll find it to be a good combination. Here is some info I have put together over the last few years on the ST51. When reading this keep in mind I use home made no nitro fuel. In fact my fuel is quite simple 19% sig castor oil and 81% methanol.
This test done 7/11/11 was performed with the engine in a Tower Hobbies Uproar and is only showing rpm’s with out all of the details of the write up. To summarize the write up I did - the 12X6 (reference being a wood prop) is the go to prop on the ST51. If your looking for speed 11X7.5 is great. The lower pitch props tend to increase the prop torque or “P” factor effect noticeable.
12X6 Zinger 10,300-3400idle
12X5 Zinger 10200 - 3820 idle
12X4 Zinger 11,800 3850 idle
11X7.5 Zinger 11,000 3500 idle
My results were the same on my Smith. I even tested the Smith with a 13X4 and even though the speed was perfect, the torque generated from the hi thrust could make the little Smith a bit more squirrelly than I liked in a given situation. I think I wrote about some of that in this thread somewhere.
In a 02/19/09 test I had one of my Super Tigre 51’s mounted in a home made engine test stand that I could measure thrust on. Again, FAI fuel....
02/19/2009 - temperature 76° - humidity 53%
Prop_ _ _ _ _ _ _ _ _ RPM_ _ _ _Thrust in lb/oz
10X8-3_ _Zingalli_ _ _ 11,000_ _3-8
10X6-2_ _MA wood_ _ _13600_ _4-4
11X7-2_ _Zinger_ _ _ _11150_ _4-1
11X7-2_ _Top Flight_ _ 11250_ _4-10
11X7.5-2_ _Zinger_ _ _11000_ _4-6
11X7.5-2_ _MA plastic_11310_ _4-10
11X8-2_ _APC_ _ _ _ _11200_ _4-5
12X4-2_ _Zinger_ _ _ _11750_ _4-12
12X5-2_ _Zinger_ _ _ _10500_ _4-12
12X6-2_ _Zinger_ _ _ _10650_ _4-14
12X10-2_ _Zinger_ _ _ 7000_ _2-14
12X12-2_ _Zinger_ _ _ 7000_ _2-15
13X4-2_ _Zinger_ _ _ _10100_ _5-3
Having a heck of a time making this chart look right hope it reads better now???