PAW vs Norvel .074
09-17-2017, 05:03 PM
#2
Join Date: Feb 2010
Location: Melbourne, AUSTRALIA
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
What size PAW are you thinking of and would the Norvel be diesel?
Norvel 074 as a glow is an excellent engine but the 6x4 three blader might be a bit small for it.
In any case it is likely to have much more power than an equivalent weight PAW (049 or 06).
A PAW 09 (1.5 cc) will be too heavy.
However for a 36" span either PAW 049 (0.8 cc) or 06 (1.0 cc) would be just fine, perhaps a little slower than a glow Norvel.
If you are happy with just cruising around and the weight is kept under control, a PAW 55 (0.55 cc) would also do the job, but vertical performance would be very modest.
Norvel 074 as a glow is an excellent engine but the 6x4 three blader might be a bit small for it.
In any case it is likely to have much more power than an equivalent weight PAW (049 or 06).
A PAW 09 (1.5 cc) will be too heavy.
However for a 36" span either PAW 049 (0.8 cc) or 06 (1.0 cc) would be just fine, perhaps a little slower than a glow Norvel.
If you are happy with just cruising around and the weight is kept under control, a PAW 55 (0.55 cc) would also do the job, but vertical performance would be very modest.
09-18-2017, 10:55 AM
#5
Will you run the Norvel .074 on diesel or glow?
The largest prop for the Norvel (on glow) is the 6.3x4 or 7x3. I have tried larger loads but the engine kind of bogs down and you get less trust from it.
The PAW on the other hand can take a 7x4 prop without any problems for the engine. That is the main difference between glow and diesel. If you run the Norvel on diesel I'm pretty sure it will easily outpower the PAW .061, and can handle even an 8x4 prop.
Another option would be the PAW .09, these are a little heavier but lighter than a typical .10 glow engines and the PAW will spin a 9x4 without any complaints. They are real smooth runners too, with a soft exhaust note.
I don't know why you are set on three blade props? These are less efficient and there are also much less of a selection to choose from.
In terms of prop load I think that a three blade 6x4 is similar to a two-blade 7x3 prop, so that might be fine for the Norvel on glow (but a bit small if you run it as a diesel).
The largest prop for the Norvel (on glow) is the 6.3x4 or 7x3. I have tried larger loads but the engine kind of bogs down and you get less trust from it.
The PAW on the other hand can take a 7x4 prop without any problems for the engine. That is the main difference between glow and diesel. If you run the Norvel on diesel I'm pretty sure it will easily outpower the PAW .061, and can handle even an 8x4 prop.
Another option would be the PAW .09, these are a little heavier but lighter than a typical .10 glow engines and the PAW will spin a 9x4 without any complaints. They are real smooth runners too, with a soft exhaust note.
I don't know why you are set on three blade props? These are less efficient and there are also much less of a selection to choose from.
In terms of prop load I think that a three blade 6x4 is similar to a two-blade 7x3 prop, so that might be fine for the Norvel on glow (but a bit small if you run it as a diesel).
09-18-2017, 12:29 PM
#7
You will not see the number of blades once the engine is running, and a heavy plane on the wrong prop is just asking for trouble. You can use a display prop for when it hangs in the shop and fly it using a two bladed one. 
