CARF-Models P-47 Thunderbolt
03-21-2015, 11:46 PM
#751
Just wondering: Does the engine/carb throw out fuel into the fuselage while the engine is running? Besides fuel proofing the firewall and maybe 6 inches behind, do I need to take care of anything else inside the fuse?
03-23-2015, 04:15 AM
#754
11 units on the dial is what i have set mine to. That is like a 14 degree pitch in the blades. Each number is one unit.
At this setting the engine when it is adjusted right should turn around 3800 rpm on the ground and will unload in the air to around 4400 rpm or maybe a bit more.
At this setting the engine when it is adjusted right should turn around 3800 rpm on the ground and will unload in the air to around 4400 rpm or maybe a bit more.
Last edited by Greg Wright; 03-23-2015 at 04:26 AM.
03-23-2015, 05:24 AM
#756
The wedge is what you will use to set the pitch with. You will need to do it on a flat suface and place the wedge under the middle section of the blade across it's width. Then you will just rotate the blade until the wedge is flat across the bottom of the blade and then just snug up the bolts until you get all four blades set. Once you do that you will tighten it all down and it should be ready to fly with. The rpm's you will want to achieve on the ground should not exceed 3800 if the pitch is set right.
03-23-2015, 06:39 AM
#761
Voy,
These are not adjustable like the solo hub is. These you have to set each blade individually with a pitch gauge and then it's the bolts that hold the blades in place.They sell the blades for this hub also.
From what i have heard thru the owner of the company they work just fine. I don't think the carf blades will work in this hub.
I have a solo hub and have had zero issues with it.
These are not adjustable like the solo hub is. These you have to set each blade individually with a pitch gauge and then it's the bolts that hold the blades in place.They sell the blades for this hub also.
From what i have heard thru the owner of the company they work just fine. I don't think the carf blades will work in this hub.
I have a solo hub and have had zero issues with it.
03-23-2015, 06:41 AM
#762
Yes Greg, this is the hub I received today from germany. Awesome quality I must say. Voy, they are adjustable to a range of pitch angles. Don't know the range though. Its quite simple really, but seems a bit crude to say the least. I cannot imagine all blades to be exact same angle. Will this pitch variance between individual blades cause vibes in the engine? How does one balance such a prop? Any links to this would be very helpful.
thanks in advance.
thanks in advance.
03-23-2015, 10:11 AM
#766
It should go without saying that balancing and tip tracking is essential in setting up the four blade prop for good performance. This can be a tedious process..
Take your time and do it right. Anything over 4000 rpm on the ground (too little pitch) may result in shedding a pushrod in the air when the engine unloads. Mine was set up at just over 3900 on the ground and I never had a problem in the air.. the engine HOWLED at full throttle 
Take your time and do it right. Anything over 4000 rpm on the ground (too little pitch) may result in shedding a pushrod in the air when the engine unloads. Mine was set up at just over 3900 on the ground and I never had a problem in the air.. the engine HOWLED at full throttle
03-23-2015, 01:16 PM
#767
I am glad to hear the Solos are running well. I'm guessing CARF changed suppliers for cost reasons ..
I definitely do not want to be tracking prop blades ! from the helicopter side of the hobby, i know what a pain tracking a 4 blade rotor head is.. and that has easily accessible links that make it easier than reworking a prop hub over and over .. I looked at the Siedel props as i hear they perform much better, but I'm sorry, i can't buy a $1250 prop. that's just bonkers!
Voy
I definitely do not want to be tracking prop blades ! from the helicopter side of the hobby, i know what a pain tracking a 4 blade rotor head is.. and that has easily accessible links that make it easier than reworking a prop hub over and over .. I looked at the Siedel props as i hear they perform much better, but I'm sorry, i can't buy a $1250 prop. that's just bonkers!
Voy
03-24-2015, 09:07 AM
#770
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Yes Greg, this is the hub I received today from germany. Awesome quality I must say. Voy, they are adjustable to a range of pitch angles. Don't know the range though. Its quite simple really, but seems a bit crude to say the least. I cannot imagine all blades to be exact same angle. Will this pitch variance between individual blades cause vibes in the engine? How does one balance such a prop? Any links to this would be very helpful.
thanks in advance.
thanks in advance.
works well
REGARDS
03-24-2015, 09:15 AM
#771
that is a great way to balance a scale multi blade prop, but with these hubs, "tracking" seems to be a concern getting it right .. I know on the Solo hub, the blade tracking is spot on for me with changes in pitch for the whole prop disk.
We have the same issue on scale helicopters. The blades must be balanced ( like balancing a prop ) ( AND CG balanced on chord and length ) .. then there is the tracking, which is getting all blades to run at the same pitch . Any of these being out of whack will induce vibration .
Voy
03-24-2015, 09:32 AM
#772
In a helicopter you can mark off one blade tip and change the pitch of the either the top or the bottom blade, but in this case, this idea doesn't seem feasible. In order to change the pitch, one has to loosen the hub and that will disturb all the blade angles? Wont it?
03-24-2015, 10:58 AM
#773
is anyone flying their thunderbolts with an iGyro? Or any other 3 axis gyro? Wondering if 3 axis stabilisation will really make a difference? What are the issues, if any, with this plane anyway? Besides the plane wanting to veer off to one side during take off. This can be addressed with the iGyro very well.
03-24-2015, 11:28 AM
#774
I owuld not use the guro for yaw stability on a plane ... it can bite you when nearing stall and wanting to snap out. The gyro will get rid of any "warning signs" you would feel/see otherwise in some situations .. the CARF Jug is heavy enough to be stable and not bounce around the air ... i think a gyro would be minimally beneficial .. with that said, id be curious to see how much of a difference it would actually make making ...
Voy
Voy
