Gatordebaitor Posted October 31, 2017 Report Share Posted October 31, 2017 Just wanted to share some points of information from trying to prop my new to me HPXV. 17v w/ Yamaha F90 - came to me with a yamaha 18p prop with a top speed of 36 mph at 5200RPMS (with a damaged blade). This weekend ran the boat with a new Merc spitfire x7 in 19p with a rubex hub. The RPM's were generally 1000 RPM's ahead of MPH with top end 46.7mph at 5900/6000RPMS. The boat generally handled very well with this prop. Only downside was some porpoising that I could only get under control by using the tabs. Next steps are to get my hands on a Powetech PTR319P and get the 18p Yamaha prop refinished. Link to comment Share on other sites More sharing options...
wayne Posted November 1, 2017 Report Share Posted November 1, 2017 is the spitfire a 4 blade prop? Link to comment Share on other sites More sharing options...
lurem Posted November 1, 2017 Report Share Posted November 1, 2017 The spitfire is a 4 blade stainless prop. Link to comment Share on other sites More sharing options...
dabear Posted November 5, 2017 Report Share Posted November 5, 2017 The spitefire X-7 is a 4 blade stainless and the spitefire with out the X-7 is a aluminum 4 blade . Dale knows this because he showed me the first Merc Spitefire X-7 I ever ran . He just didnt put the X-7 on his answer . Link to comment Share on other sites More sharing options...
Gatordebaitor Posted November 6, 2017 Author Report Share Posted November 6, 2017 Anybody have a PTR3 19p laying around? Link to comment Share on other sites More sharing options...
wayne Posted November 6, 2017 Report Share Posted November 6, 2017 You are seeing better numbers with the prop you have than I'm seeing with my PTR 19.. you mentioned porpoising, I find this hull very sensitive to trim... Every time I change speed I have to micro trim or I get porpoising with the PTR ... I think it's just the nature of the set up... Link to comment Share on other sites More sharing options...
lurem Posted November 6, 2017 Report Share Posted November 6, 2017 People still buy aluminum props???!! haha j/k Link to comment Share on other sites More sharing options...
geeviam Posted November 6, 2017 Report Share Posted November 6, 2017 On 11/5/2017 at 8:46 PM, Gatordebaitor said: Anybody have a PTR3 19p laying around? Yes. It's used, but not much. However, the previous owner did some custom cupping work on the blade tips, on the hitch ball of his truck - lol. This prop is too large for my setup so I don't need it. I will sell it for $90.00 including shipping. Link to pics: PTR3 19 pitch pics PM me if you are interested *Edited to add pics Link to comment Share on other sites More sharing options...
Gatordebaitor Posted November 7, 2017 Author Report Share Posted November 7, 2017 On 11/5/2017 at 11:38 PM, wayne said: You are seeing better numbers with the prop you have than I'm seeing with my PTR 19.. you mentioned porpoising, I find this hull very sensitive to trim... Every time I change speed I have to micro trim or I get porpoising with the PTR ... I think it's just the nature of the set up... What #'s are you seeing with the PTR Wayne? Link to comment Share on other sites More sharing options...
Gatordebaitor Posted November 7, 2017 Author Report Share Posted November 7, 2017 18 hours ago, geeviam said: Yes. It's used, but not much. However, the previous owner did some custom cupping work on the blade tips, on the hitch ball of his truck - lol. This prop is too large for my setup so I don't need it. I will sell it for $90.00 including shipping. Link to pics: PTR3 19 pitch pics PM me if you are interested *Edited to add pics PM Sent Link to comment Share on other sites More sharing options...
wayne Posted November 7, 2017 Report Share Posted November 7, 2017 I'm running low 40s loaded.. I think the most I've ever seen is 45 and that was empty with no gas... Link to comment Share on other sites More sharing options...
Gatordebaitor Posted November 8, 2017 Author Report Share Posted November 8, 2017 I saw 48.2 with a little less than a 1/4 tank of gas on my second run with the spitfire last week, so I see what you are saying. Maybe I will just have to learn how to drive around the porpoising issue. I'm probably still going to try the PTR so I don't have to wonder as it has been generally been billed as the best prop for this setup. Link to comment Share on other sites More sharing options...
wayne Posted November 8, 2017 Report Share Posted November 8, 2017 Best, is a subjective and relative term... With the numbers your getting I would call it done, spend the money on some new fishing gear... I'm thinking about getting me an X7 at this point.. Link to comment Share on other sites More sharing options...
geeviam Posted November 8, 2017 Report Share Posted November 8, 2017 On 11/6/2017 at 5:01 PM, geeviam said: Anybody have a PTR3 19p laying around? On 11/6/2017 at 5:01 PM, geeviam said: Yes. It's used, but not much. However, the previous owner did some custom cupping work on the blade tips, on the hitch ball of his truck - lol. This prop is too large for my setup so I don't need it. I will sell it for $90.00 including shipping. Link to pics: PTR3 19 pitch pics PM me if you are interested *Edited to add pics SOLD Link to comment Share on other sites More sharing options...
lurem Posted November 8, 2017 Report Share Posted November 8, 2017 Another Spitfire X-7 member! There are a few of us running them now with good results. Link to comment Share on other sites More sharing options...
Gatordebaitor Posted March 6, 2018 Author Report Share Posted March 6, 2018 Finally getting the PTR dialed. I'll report back in this thread. The x7 has lost some juice and I am still befuddled by how badly this boat porpoises at most speeds. Link to comment Share on other sites More sharing options...
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