jan brilman
Forum veteraan
Collegae!
Blijkbaar heb ik deze mensen een keer gemaild, want ik kreeg de volgende mail (ik heb geen aandelen).
Een lang verhaal, maar voor de echte die-hards is het smullen. Kijk vooral op de site en naar de filmpjes.
Vooral het TEST STAND MOVIE filmpje is mooi.
(Voor wie geen idee heeft waar dit over gaat: deze heren hebben een vertraging voor grote benzine-motoren ontwikkeld, waardoor je goed bv. een Mustang met een grote vier-blad propellor kunt uitrusten.
)
Hello All:
1st, I would like to thank you for taking the time over the last 18 months to email us with your interest in and questions about our Reduction Drive, and now our Constant Speed Prop.
I was on a Red Eye flight the other day and it struck me that you all have taken the time to write me at one time (or 2 or 3) but I haven’t written specifically to you.
So, please accept my apologies and let me tell you what is happening.
1st, Toledo was a big success. We were not only able to showcase our new Constant Speed Prop design, but also to meet new like minded RC enthusiasts, chat with old friends as well as chatting with multiple vendors, and even get some press coverage (we are supposed to be in the latest issue of FLY RC, and possibly High Flight). Not bad for 3 days of hanging out doing what we like to do.
Now, the info that you all want to hear on the drives.
CURRENT WORK
We have the drive unit itself ready to go to market after some additional testing.
We have made 3 changes now to the lay-up schedule on the prop blades, and we think we have it just where we want it. It is a balancing act between enough material for strength and stiffness, and not too much.
We are completing our vibrational testing this weekend. This is very critical, as when the prop is running, we don’t want to have any frequencies that resonate and create extraordinary stress on the blades and set the blades up for failure. This has to be right, or the blades will fail.
TESTING STATUS
We have done some flight testing of the TF Mustang to get some performance metrics. Almost done with these tests, just a few more flights to complete.
The H9 1/3 Scale 97” WS CAP 232 is ready for its 1st flight with the reduction drive. This is the plane featured in the videos on the website with the old design drive.
Blades should be out of my partner’s hands and into mine by middle of next week.
If the weather holds out, I plan on some ground tests May 5th and May 6th.
Based upon the Ground tests being successful, 1st flight tests to begin on May 6th.
TRAVEL PLANS
If we have a successful flight test by May 6th and May 10th, and a few other things come together, we will pack up the plane, drive and blades and go down to the Joe Nall fly-in. We may or may not fly there, but we would be there to show off the drive, blades and an installed drive in the Mustang.
FAQ’s
Q: When will the drive and prop be available for purchase?
A: We are targeting selling the drives and prop in June. If the fight tests go well, we should make that date (late June). If we have any issues (hey, who here knows Murphy?) then there will be a delay. Believe me, we’d really like to exchange drives for money, but no sales until we know its right.
Q: What will the whole thing cost?
A: The drive is priced at $300 USD, the Constant Speed Prop hub and governing computer at $375 USD, and the blades at $30 USD each.
Q: What about a 3 blade hub?
A: We do have a 3 blade hub and the price is the same as the 4 blade hub.
Q: I have a Composite-Arf Mustang-Will you make a prop for this airplane?
A: We have one too!! Yes, we will.
Q: Will a 50cc motor fly a 38# plane like the Ziroli Mustang or Composite-Arf Mustang?
A: That’s a darn good question. Last year, with a fixed pitch 26x24 3 blade prop, we did fly the 26.5# Cap with pretty reasonable vertical. Since the Constant Speed prop has a pitch range of approx 18” to 50” of pitch, we think that it will fly the Big Iron just fine. If the Ziroli or Comp-Arf Mustangs will fly on a 70-80cc motor and a fixed pitch prop, we think that it will fly on a Constant Speed prop turned by a DA-50R or ZDZ 50. But, bottom line, we’ll have to prove it to ourselves before we can prove it to you!!
Q: If I buy a Constant Speed hub now and the 26” blades for the TF Mustang, can I use the hub for the Composite-Arf Mustang?
A: Yes you can. The hub is designed for growth, and can accommodate blades up to at least 31” overall diameter.
Q: How am I supposed to fit your prop into a spinner? Who makes one that will look scale, with the prop blades not flat against the backplate?
A: We know what you mean, and we will be coming out with an all composite spinner with the blades placed in the scale position. If you look at the pictures of the drive in the plane, the position of the blades are in the scale position.
Q: I have an XXXX motor, will your drive fit my motor?
A: Our drive is designed to accept the DA-50R and the ZDZ 50. We are looking at other motors (we have about 20 different motors people would like to see us make drives for). We will make drives to accept other motors after we get some of the 50cc sized drives out in the market. Some motors will be relatively easy to adapt (think ZDZ 80 single) while others will be more development time.
Q: What is the next motor you are going to design a drive for?
A: That is an excellent question. We are looking at 80cc singles, and there is a lot of interest in the G-62. We will keep you posted.
Q: What’s the deal, just come out with a drive for my motor!!
A: We do listen to our customers, so it is tough saying no to anyone (I know I don’t’ like to hear no!).
The big issue is that with a motor that has side induction and side exhaust, there isn’t a lot of “real estate” to make every thing fit. Motors that have really short noses (G-62) have a different solution than ones with medium length noses (DA-50R) vs long noses (Revolution 52). Anything with linkages from carb to spark advance (Brison) is a whole different solution set. Beam mounted motors are another solution set. Finally, each engine has an optimal RPM range and that, coupled with the optimal RPM of our prop design, makes the requirement for different ratios a real possibility. Different ratios require either a different belt length (a finite number of choices here) or different sized pulleys (limited by the geometry of center distance) and trying to fit the whole thing in the cowl.
Not trying to make excuses, but as you can see, the design solutions become more complex depending on a lot of different factors.
Finally, if there is a demand for 1 copy of a drive for one type/size of motor, it is not practical for us to make a unique design for just one motor. That’s why we have been asking people to tell us which motor they would like to see a drive for, because we need to know more about what the market wants, so we can meet the overall markets needs.
Q: What is the next prop design you are coming out with?
A: There is a fair amount of interest in the FW 190, Spitfire, P-40. We haven’t made a final decision, but we are trying to follow your interests closely.
Q: What about us Aerobatic guys, are you going to make something for us?
A: Absolutely!! The design for the Aerobatic CS prop will be totally different because the demands on a 3-D type plane are very different from a Warbird platform. The requirement to only swing 2 blades and desire to have the pitch go to beta and reverse requires a different solution. Weight is also a much bigger consideration on an IMAC type plane, so our design will accommodate those unique needs
cheers
Joe Boyd
www.warbirdpropdrives.com
jan.
Blijkbaar heb ik deze mensen een keer gemaild, want ik kreeg de volgende mail (ik heb geen aandelen).
Een lang verhaal, maar voor de echte die-hards is het smullen. Kijk vooral op de site en naar de filmpjes.
Vooral het TEST STAND MOVIE filmpje is mooi.
(Voor wie geen idee heeft waar dit over gaat: deze heren hebben een vertraging voor grote benzine-motoren ontwikkeld, waardoor je goed bv. een Mustang met een grote vier-blad propellor kunt uitrusten.
) Hello All:
1st, I would like to thank you for taking the time over the last 18 months to email us with your interest in and questions about our Reduction Drive, and now our Constant Speed Prop.
I was on a Red Eye flight the other day and it struck me that you all have taken the time to write me at one time (or 2 or 3) but I haven’t written specifically to you.
So, please accept my apologies and let me tell you what is happening.
1st, Toledo was a big success. We were not only able to showcase our new Constant Speed Prop design, but also to meet new like minded RC enthusiasts, chat with old friends as well as chatting with multiple vendors, and even get some press coverage (we are supposed to be in the latest issue of FLY RC, and possibly High Flight). Not bad for 3 days of hanging out doing what we like to do.
Now, the info that you all want to hear on the drives.
CURRENT WORK
We have the drive unit itself ready to go to market after some additional testing.
We have made 3 changes now to the lay-up schedule on the prop blades, and we think we have it just where we want it. It is a balancing act between enough material for strength and stiffness, and not too much.
We are completing our vibrational testing this weekend. This is very critical, as when the prop is running, we don’t want to have any frequencies that resonate and create extraordinary stress on the blades and set the blades up for failure. This has to be right, or the blades will fail.
TESTING STATUS
We have done some flight testing of the TF Mustang to get some performance metrics. Almost done with these tests, just a few more flights to complete.
The H9 1/3 Scale 97” WS CAP 232 is ready for its 1st flight with the reduction drive. This is the plane featured in the videos on the website with the old design drive.
Blades should be out of my partner’s hands and into mine by middle of next week.
If the weather holds out, I plan on some ground tests May 5th and May 6th.
Based upon the Ground tests being successful, 1st flight tests to begin on May 6th.
TRAVEL PLANS
If we have a successful flight test by May 6th and May 10th, and a few other things come together, we will pack up the plane, drive and blades and go down to the Joe Nall fly-in. We may or may not fly there, but we would be there to show off the drive, blades and an installed drive in the Mustang.
FAQ’s
Q: When will the drive and prop be available for purchase?
A: We are targeting selling the drives and prop in June. If the fight tests go well, we should make that date (late June). If we have any issues (hey, who here knows Murphy?) then there will be a delay. Believe me, we’d really like to exchange drives for money, but no sales until we know its right.
Q: What will the whole thing cost?
A: The drive is priced at $300 USD, the Constant Speed Prop hub and governing computer at $375 USD, and the blades at $30 USD each.
Q: What about a 3 blade hub?
A: We do have a 3 blade hub and the price is the same as the 4 blade hub.
Q: I have a Composite-Arf Mustang-Will you make a prop for this airplane?
A: We have one too!! Yes, we will.
Q: Will a 50cc motor fly a 38# plane like the Ziroli Mustang or Composite-Arf Mustang?
A: That’s a darn good question. Last year, with a fixed pitch 26x24 3 blade prop, we did fly the 26.5# Cap with pretty reasonable vertical. Since the Constant Speed prop has a pitch range of approx 18” to 50” of pitch, we think that it will fly the Big Iron just fine. If the Ziroli or Comp-Arf Mustangs will fly on a 70-80cc motor and a fixed pitch prop, we think that it will fly on a Constant Speed prop turned by a DA-50R or ZDZ 50. But, bottom line, we’ll have to prove it to ourselves before we can prove it to you!!
Q: If I buy a Constant Speed hub now and the 26” blades for the TF Mustang, can I use the hub for the Composite-Arf Mustang?
A: Yes you can. The hub is designed for growth, and can accommodate blades up to at least 31” overall diameter.
Q: How am I supposed to fit your prop into a spinner? Who makes one that will look scale, with the prop blades not flat against the backplate?
A: We know what you mean, and we will be coming out with an all composite spinner with the blades placed in the scale position. If you look at the pictures of the drive in the plane, the position of the blades are in the scale position.
Q: I have an XXXX motor, will your drive fit my motor?
A: Our drive is designed to accept the DA-50R and the ZDZ 50. We are looking at other motors (we have about 20 different motors people would like to see us make drives for). We will make drives to accept other motors after we get some of the 50cc sized drives out in the market. Some motors will be relatively easy to adapt (think ZDZ 80 single) while others will be more development time.
Q: What is the next motor you are going to design a drive for?
A: That is an excellent question. We are looking at 80cc singles, and there is a lot of interest in the G-62. We will keep you posted.
Q: What’s the deal, just come out with a drive for my motor!!
A: We do listen to our customers, so it is tough saying no to anyone (I know I don’t’ like to hear no!).
The big issue is that with a motor that has side induction and side exhaust, there isn’t a lot of “real estate” to make every thing fit. Motors that have really short noses (G-62) have a different solution than ones with medium length noses (DA-50R) vs long noses (Revolution 52). Anything with linkages from carb to spark advance (Brison) is a whole different solution set. Beam mounted motors are another solution set. Finally, each engine has an optimal RPM range and that, coupled with the optimal RPM of our prop design, makes the requirement for different ratios a real possibility. Different ratios require either a different belt length (a finite number of choices here) or different sized pulleys (limited by the geometry of center distance) and trying to fit the whole thing in the cowl.
Not trying to make excuses, but as you can see, the design solutions become more complex depending on a lot of different factors.
Finally, if there is a demand for 1 copy of a drive for one type/size of motor, it is not practical for us to make a unique design for just one motor. That’s why we have been asking people to tell us which motor they would like to see a drive for, because we need to know more about what the market wants, so we can meet the overall markets needs.
Q: What is the next prop design you are coming out with?
A: There is a fair amount of interest in the FW 190, Spitfire, P-40. We haven’t made a final decision, but we are trying to follow your interests closely.
Q: What about us Aerobatic guys, are you going to make something for us?
A: Absolutely!! The design for the Aerobatic CS prop will be totally different because the demands on a 3-D type plane are very different from a Warbird platform. The requirement to only swing 2 blades and desire to have the pitch go to beta and reverse requires a different solution. Weight is also a much bigger consideration on an IMAC type plane, so our design will accommodate those unique needs
cheers
Joe Boyd
www.warbirdpropdrives.com
jan.
): ik ben ook benieuwd of de electro-mensen ideeen hebben om iets dergelijks gelectrificeerd uit te voeren, en dat staat hier:
