New CARF P-51D Project
07-10-2017, 12:39 AM
#76
So now the epoxy for the front bulkhead is curing and tomorrow I'll remove the engine so I can finish up the reinforcement.
Then the fun starts with the baffles and stuff associated with that.
I also started check fitting the cowl. Very disappointed here. The front edges are not even close to being even. I set the engine so the spinner backplate is flush with the chin scoop. When I set the cowl on there's a huge gap. So I need to sand back the chin scoop and add back to the cowl!
You have to block sand the cowl a bit here and ther to tighten up the gaps at the seams. I'm still thinking about how to attach it because I'm trying to decide on the start sequence and dealing with the cowl. The starter ESC and battery will be external for sure.
Then the fun starts with the baffles and stuff associated with that.
I also started check fitting the cowl. Very disappointed here. The front edges are not even close to being even. I set the engine so the spinner backplate is flush with the chin scoop. When I set the cowl on there's a huge gap. So I need to sand back the chin scoop and add back to the cowl!
You have to block sand the cowl a bit here and ther to tighten up the gaps at the seams. I'm still thinking about how to attach it because I'm trying to decide on the start sequence and dealing with the cowl. The starter ESC and battery will be external for sure.
07-12-2017, 04:17 PM
#78
Ahead of this duct is the cockpit floor section then the front floor. Up front will be the fuel tank, ignition and battery pack, throttle and choke servos.
Im making them removable for servicing. The front floor panel will be mounted with rubber grommets to help with vibration dampening.
The wire for the position sensor from the front of the engine is just a couple inches short of making installing the ignition box in a more convenient place.
Im making them removable for servicing. The front floor panel will be mounted with rubber grommets to help with vibration dampening.
The wire for the position sensor from the front of the engine is just a couple inches short of making installing the ignition box in a more convenient place.
08-17-2017, 08:34 PM
#81
Yup more coming. I've been busy and also making some progress on the project.
Anybody solve the exhaust problem with these Kolm engines? I don't want holes coming out the bottom of the nose. I'm considering making my own exhaust because I have not seen one available yet.
Anybody solve the exhaust problem with these Kolm engines? I don't want holes coming out the bottom of the nose. I'm considering making my own exhaust because I have not seen one available yet.
The following users liked this post:
apereira (06-23-2023)
08-19-2017, 04:34 AM
#83
Yup more coming. I've been busy and also making some progress on the project.
Anybody solve the exhaust problem with these Kolm engines? I don't want holes coming out the bottom of the nose. I'm considering making my own exhaust because I have not seen one available yet.
Anybody solve the exhaust problem with these Kolm engines? I don't want holes coming out the bottom of the nose. I'm considering making my own exhaust because I have not seen one available yet.
Kalvin from Kellio creations sells the two manifolds for the plane. You would just need to figure out how to run some tubes up to each one for each cylinder. Mike Scoles might still have the ones that i sent him with the plane i sold him a couple years ago. Give him a shout out on here. DrScoles is his signature on here.
08-20-2017, 08:00 PM
#84
Thanks guys,
I heard Kelvin is not producing exhausts due to health reasons, I'm sorry to hear that if it's true. I can ask Mike about his parts if only just to see them. I've been thinking of how to make my own exhaust system and it's pretty expensive to get the tools and tubing but doable.
Spent some time on the servos and the plate today. It's amazing how much planning goes into these projects especially when I'm trying to make it serviceable and accessible. So you look back and it seems like nothing has been done but in fact a lot is done and planned.
Figured out a reliable throttle linkage I can take apart to pull the engine. I'm safety wiring the head of the screw to the link rod when it's finished. You can see in the photo what I mean. I used the ball link on the engine as supplied at first but then realized it was metric. I switched out the last ball link to adapt to 4-40 rod by popping the ball out of the old one and switching to the new one. The rest is pretty straight forward. The choke linkage is the same story.
The servos were another issue. I wanted to keep them out of the heat and space is tight on the plate so ganging them together on top was a good option. I needed two axis and different heights so as you see in the photo this is the result. I'm going to shim the choke servo screws to tilt the servo away from the fuselage, it's just barely touching.
I heard Kelvin is not producing exhausts due to health reasons, I'm sorry to hear that if it's true. I can ask Mike about his parts if only just to see them. I've been thinking of how to make my own exhaust system and it's pretty expensive to get the tools and tubing but doable.
Spent some time on the servos and the plate today. It's amazing how much planning goes into these projects especially when I'm trying to make it serviceable and accessible. So you look back and it seems like nothing has been done but in fact a lot is done and planned.
Figured out a reliable throttle linkage I can take apart to pull the engine. I'm safety wiring the head of the screw to the link rod when it's finished. You can see in the photo what I mean. I used the ball link on the engine as supplied at first but then realized it was metric. I switched out the last ball link to adapt to 4-40 rod by popping the ball out of the old one and switching to the new one. The rest is pretty straight forward. The choke linkage is the same story.
The servos were another issue. I wanted to keep them out of the heat and space is tight on the plate so ganging them together on top was a good option. I needed two axis and different heights so as you see in the photo this is the result. I'm going to shim the choke servo screws to tilt the servo away from the fuselage, it's just barely touching.
08-23-2017, 10:55 AM
#86
I think it would be near impossible to get the scale exhaust to work with this motor... No space, and would generate more heat. I used the scale exhaust as... ready for it... scale exhaust. I whacked the back of them and put them on for show... they look bad ass! However, added a lot of unwanted weight to the nose. Chris, I would go with the resin ones and make them look pretty.
08-23-2017, 11:18 AM
#87
Well, I can tell you this much. I was at the Horizon Airmeet in Germany this past weekend and there mr c-arf himself was flying the galloping ghost with the kolm 230 3 cylinder engine with a higly functional exhaust and scale looks. It is a prototype exhaust that will be available as soon as its ready for release. So unfortunately no pictures was allowed but I can say that it higly efficient as there was hardly any exhaust sound at all from the model...it sounded very scale like blowing by at full throttle....
08-23-2017, 11:28 AM
#88
There is some pictures of the model in my album here at my facebook page.
I also have some video of the model flying and will post it soon on my youtube channel..
I also have some video of the model flying and will post it soon on my youtube channel..
Last edited by flypilot; 08-23-2017 at 11:35 AM.
08-23-2017, 11:43 AM
#90
Im sorry I don't have any details as its a work in progress and not ready for release yet unfortunatly. In my opinion I think the engine sounds the best with straight pipes but its not very flying field friendly in the long term. I would think that a new 3in1 header would make it a whole lot easier to apply some kind of dampening yes..
08-23-2017, 09:39 PM
#91
Well I'm thinking it will just have to happen because I'm not liking the idea of holes in the bottom of the nose. I've found the materials and the tool I just need the time to do it.
So, we'll see, I can get the header flange plates machined at my work.
So, we'll see, I can get the header flange plates machined at my work.
09-04-2017, 09:23 AM
#92
Finally laid up the fiberglass duct yesterday. Came out pretty light and simple. I'll be installing that and posting pics tonight.
Pulled the engine back out to make the baffles. This should be pretty straight forward but time consuming because of the fitting required. To do it right I'd have to make a separate compartment for the carbs but I think it will be fine to just make sure they are first to see cold air. This is a fully ducted cooling system and the trick is to make the engine removable for service.
Speaking of service, has anyone else noticed how much these engines seep/leak oil?!? No joke, there must not be any seals just black RTV gaskets because there's oil coming from every cover and bolt. For $5000.00 I'm not impressed, sorry to say. Laser cut or die cut some gaskets because this is just basic engine and product design 101 stuff.
Pulled the engine back out to make the baffles. This should be pretty straight forward but time consuming because of the fitting required. To do it right I'd have to make a separate compartment for the carbs but I think it will be fine to just make sure they are first to see cold air. This is a fully ducted cooling system and the trick is to make the engine removable for service.
Speaking of service, has anyone else noticed how much these engines seep/leak oil?!? No joke, there must not be any seals just black RTV gaskets because there's oil coming from every cover and bolt. For $5000.00 I'm not impressed, sorry to say. Laser cut or die cut some gaskets because this is just basic engine and product design 101 stuff.
09-05-2017, 04:45 PM
#96
So now you can imagine the duct I was making and the cockpit floor will go over this next. There's a good opportunity to install a servo to make the exhaust door function much like how the full scale duct works.
Im placing a plank on each side of the cockpit like a running board I guess. This gives us the route to run servo leads and air lines to the RX in a discreet way. Then the center portion of the floor can be removed for full access to the interior.
More to come..
Im placing a plank on each side of the cockpit like a running board I guess. This gives us the route to run servo leads and air lines to the RX in a discreet way. Then the center portion of the floor can be removed for full access to the interior.
More to come..
09-06-2017, 01:48 AM
#97
I know the duct makes things more effecient and tidy, but do you think having a duct is s trictly nescesarry? Should not the air escape out the back anyhow as long as the air is pushed in from the front? Just wondering, but like I said I can see that the ducts are more effecient...
09-06-2017, 03:41 PM
#98
Yes agreed except I'm also considering not exposing anything else to heat and fumes as much as possible.
I had to make a cockpit floor and tray for the tank anyway which presented the option to make a duct in back to neatly direct the hot air. You could have the fuselage act like the duct and not bother but for very little effort it was easy for me to go this route.
I had to make a cockpit floor and tray for the tank anyway which presented the option to make a duct in back to neatly direct the hot air. You could have the fuselage act like the duct and not bother but for very little effort it was easy for me to go this route.
