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RE: Yet another Yellow Spitfire build thread
Chad
Your CRAFTMANSHIP is Amizing .......http://www.rcuniverse.com/forum/js/f...eeth_smile.gif Semper Fi Joe |
RE: Yet another Yellow Spitfire build thread
Prop size and blade count can fun can't it? Regarding Vario prop to be honest I hadn't really thought about it, until now. The power setup we are starting with should turn a 20X13 prop somewhere around 7000 RPM the KVon the motor is 171, with that being well under 9000 its possible - Maybe.
What I have found with 3 blades and will smaller models and 4 blade props is that they look better but tend to use more power over a 2 blade and don't go as fast as their 2 blade brothers. One of our considerations is flight duration. Ihad a couple motors in mind before settling on on the RimFire 65 the other choices had higher KVratings, so for a given voltage the motor would turn faster which would generally make the prop turn faster and the plane go faster, no surprises there, the down side was the combination would draw more amps this does a couple of things, reduces flight times and makes heat. Enter another design another design requirment, scale cowl, to me that means no holes. I am pretty sure we could make this thing go like crazy for a couple minutes then land and do so with a very hot motor and batteries. As with all things electric heat kills, and the motor's magnets can start to loose their strength when heated into the 180 degree range. As we want to only use the exhaust holes to move air out from around the motor we do not need to make a lot of heat. I think that when we are all said and done the plane will be ready to fly in the 28 pound range less would be better, those 8,000 mah batteries are heavy :-), with the 12S config and RimFire 65cc we should be producing just over 3200 watts which should translate into about 2800 once the prop is factored in. This will yield a thrust ratio in the 1 to 1 range and be at the 100 watts/pound mark, while running the motor a 50% of its max and pulling about 70 to 80 amps. This should not get to hot and will not stress the batteries If heat is not an issue a 21X14 could be possible this will be a bit faster than the 13 pitch and the climb would be interesting. Anyway that is the theory and will all things mileage does vary and will will see once its flying and the data from the speed control and GPScomes in. And besides after all that once the prop is spinning most 3 and 4 blades look like a 2 blade http://www.rcuniverse.com/forum/js/f...eeth_smile.gif. Sorry for the long post Cheers ORIGINAL: Chad Veich Prop selection will be left totally to the discretion of the owner but all talk thus far has indicated that the optimal two blader will be used and a static 5-blader will be made up for show. I will let Rick explain the reasoning in regards to prop choice if he wants to discuss it. Did I mention I'm totally illiterate when it comes to electric power systems? I think I'm about to get an education! |
RE: Yet another Yellow Spitfire build thread
ORIGINAL: F4u5 Should be great work Chad..love your stuff. ORIGINAL: uncljoe Chad Your CRAFTMANSHIP is Amizing .......[img][/img] ORIGINAL: AZThud Prop size and blade count can fun can't it? Regarding Vario prop to be honest I hadn't really thought about it, until now. The power setup we are starting with should turn a 20X13 prop somewhere around 7000 RPM the KV on the motor is 171, with that being well under 9000 its possible - Maybe. What I have found with 3 blades and will smaller models and 4 blade props is that they look better but tend to use more power over a 2 blade and don't go as fast as their 2 blade brothers. One of our considerations is flight duration. I had a couple motors in mind before settling on on the RimFire 65 the other choices had higher KV ratings, so for a given voltage the motor would turn faster which would generally make the prop turn faster and the plane go faster, no surprises there, the down side was the combination would draw more amps this does a couple of things, reduces flight times and makes heat. Enter another design another design requirment, scale cowl, to me that means no holes. I am pretty sure we could make this thing go like crazy for a couple minutes then land and do so with a very hot motor and batteries. As with all things electric heat kills, and the motor's magnets can start to loose their strength when heated into the 180 degree range. As we want to only use the exhaust holes to move air out from around the motor we do not need to make a lot of heat. I think that when we are all said and done the plane will be ready to fly in the 28 pound range less would be better, those 8,000 mah batteries are heavy :-), with the 12S config and RimFire 65cc we should be producing just over 3200 watts which should translate into about 2800 once the prop is factored in. This will yield a thrust ratio in the 1 to 1 range and be at the 100 watts/pound mark, while running the motor a 50% of its max and pulling about 70 to 80 amps. This should not get to hot and will not stress the batteries If heat is not an issue a 21X14 could be possible this will be a bit faster than the 13 pitch and the climb would be interesting. Anyway that is the theory and will all things mileage does vary and will will see once its flying and the data from the speed control and GPS comes in. And besides after all that once the prop is spinning most 3 and 4 blades look like a 2 blade [img][/img]. |
RE: Yet another Yellow Spitfire build thread
1 Attachment(s)
Hey Chad,
Great project! Looking forward to the build. I'm sure the attention to detail on this will be second to none. You picked my favorite Spitfire scheme. The first yellow spit I ever built I did in that scheme, although as you know it was the restored PS915. I sold it some years ago and it's still around here in town. I think I still have an extra panther decal in vinyl if you want it. Happy to send it to you It might not be exact for the wartime version but it was done to look like the restoration. You might be able to use it as a starting point for a template or something. Shoot me your addy and I'll drop it in the mail for you. I'm sure you "the spitfire guru" have seen this site, but for those that have not its a great webpage from the 152nd squadron. Some great stuff on there. Have a look - http://www.152hyderabad.co.uk/ I'm really looking forward to this build. From one spitfire nut to another! Dave |
RE: Yet another Yellow Spitfire build thread
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RE: Yet another Yellow Spitfire build thread
ORIGINAL: smurfjet Hey Chad, Great project! Looking forward to the build. I'm sure the attention to detail on this will be second to none. You picked my favorite Spitfire scheme. The first yellow spit I ever built I did in that scheme, although as you know it was the restored PS915. I sold it some years ago and it's still around here in town. I think I still have an extra panther decal in vinyl if you want it. Happy to send it to you It might not be exact for the wartime version but it was done to look like the restoration. You might be able to use it as a starting point for a template or something. Shoot me your addy and I'll drop it in the mail for you. I'm sure you ''the spitfire guru'' have seen this site, but for those that have not its a great webpage from the 152nd squadron. Some great stuff on there. Have a look - http://www.152hyderabad.co.uk/ I'm really looking forward to this build. From one spitfire nut to another! Dave |
RE: Yet another Yellow Spitfire build thread
Hello Chad
The 5 blade static prop is available through yellow aircraft i believe. An other source is http://www.fighteraces.co.uk/ Still have a kit myself of the yellow spit waiting a couple of years now [&o], my build list is too long... Looking forward to this electric powered version, although not being a big fan (yet) of electric powered warbirds at the moment Maybe your build will change my mind ;) Frank |
RE: Yet another Yellow Spitfire build thread
Good luck Chad, I'm sure you will do a wonderful job. I'll be watching.
Cheers, Brad |
RE: Yet another Yellow Spitfire build thread
Didn't Yellow used to offer fiberglass static blade for the spit?
EDIT: yes they do http://www.yellowaircraft.com/props/spitfire.htm FIBERGLASS STATIC PROPELLER WITH SPINNER............SPIT121 |
RE: Yet another Yellow Spitfire build thread
Looking forward to the build as well. Has YA gotten away from the fiberglass horizontal stabilizer (maybe it was the elevators that were fiberglass)?
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RE: Yet another Yellow Spitfire build thread
Thanks for the information on the static prop guys. I guess I knew that Yellow offered it but for some reason it had slipped my mind. Getting old sucks!
Steve, the kit still comes with a fiberglass horizontal stab but I'm not a fan of it. They are generally a bit on the "wavy" side and do not allow for an easy method of scale hinging. Plus, my built up tail has proven to be lighter which is always a factor with Spitfires. |
RE: Yet another Yellow Spitfire build thread
Hey Chad,
Following along on your build. As you know I built one for a friend of mine a while back completely stock. He was doing the finishing. Always enjoy your builds and your engineering. Very informative. Thanks, Fred Menna Check6 |
RE: Yet another Yellow Spitfire build thread
Hello Chad,
I am interested in the detail kits that you are producing for the YA Spitfire. Are they currently available...? Blue Skies, ... |
RE: Yet another Yellow Spitfire build thread
ORIGINAL: dblmars Hello Chad, I am interested in the detail kits that you are producing for the YA Spitfire. Are they currently available...? Blue Skies, ... +1 |
RE: Yet another Yellow Spitfire build thread
ORIGINAL: Check6 Always enjoy your builds and your engineering. Very informative. |
RE: Yet another Yellow Spitfire build thread
ORIGINAL: dblmars Hello Chad, I am interested in the detail kits that you are producing for the YA Spitfire. Are they currently available...? Blue Skies, ... |
RE: Yet another Yellow Spitfire build thread
ORIGINAL: Chad Veich ORIGINAL: dblmars Hello Chad, I am interested in the detail kits that you are producing for the YA Spitfire. Are they currently available...? Blue Skies, ... Brad |
RE: Yet another Yellow Spitfire build thread
ORIGINAL: Brad330l Chad please make a perfectly balanced scale shaped lite and strong flying spinner out of carbon fibre for us all.:D |
RE: Yet another Yellow Spitfire build thread
Really? What's wrong with the spinner? I've been flying with the stock one for years.<div>
</div><div>Whit</div> |
RE: Yet another Yellow Spitfire build thread
Spinner:
The recess in the back plate - uggghhh! The heavy back plate really slows the spool up time of the engine and is hard on the front bearing. A single center bolt would make taking the spinner cone off and on easier. cheers, ken |
RE: Yet another Yellow Spitfire build thread
I 2nd the center bolt method. All those little screws is a real PIA. Ever had the allen head opening in a button head screw get enlarged? Very difficult to get out.
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RE: Yet another Yellow Spitfire build thread
Along with the issues mentioned above the spinner has always appeared a bit too "bulbous" to my eye.
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RE: Yet another Yellow Spitfire build thread
I may be willing to mold a carbon spinner for this model..
The big question is, what are you guys willing to pay for the spinner? How many are interested? |
RE: Yet another Yellow Spitfire build thread
I would be interested, obviously price dependent.<div>
</div><div>What is the stock spinners list price?</div><div> </div><div>Whit</div> |
RE: Yet another Yellow Spitfire build thread
I also would be interested and price dependant
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