OPS .65 bench run.. finally!
10-14-2009, 01:02 AM
#26
RE: OPS .65 bench run.. finally!
Sometime during a 3 minute flight with my 1st fast delta, the battery some how tore out of the aft end compartment and was hanging by the wiring. That's something that you only let happen once.
I've noticed a few Picco and OPS .60s for sale lately. New, too....how can anyone buy one of these engines and never use it?
I've noticed a few Picco and OPS .60s for sale lately. New, too....how can anyone buy one of these engines and never use it?
10-14-2009, 07:05 AM
#27
10-14-2009, 07:07 AM
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RE: OPS .65 bench run.. finally!
ORIGINAL: combatpigg
Sometime during a 3 minute flight with my 1st fast delta, the battery some how tore out of the aft end compartment and was hanging by the wiring. That's something that you only let happen once.
I've noticed a few Picco and OPS .60s for sale lately. New, too....how can anyone buy one of these engines and never use it?
Sometime during a 3 minute flight with my 1st fast delta, the battery some how tore out of the aft end compartment and was hanging by the wiring. That's something that you only let happen once.
I've noticed a few Picco and OPS .60s for sale lately. New, too....how can anyone buy one of these engines and never use it?
Fear?
So we can get them cheaper?
[8D]
10-14-2009, 12:39 PM
#32
RE: OPS .65 bench run.. finally!
He hasn't flown it with a full load prop yet. Unless you get firm instructions from someone who is using the same identical prop, pipe set up, head clearance, chamber design, etc., you can't arbitrarily say "I'm going to run XX% nitro". The piston and conrod will let you know quickly if you guess wrong, even the head will sacrifice metal. These piped racing engines need to be kept in better shape than your average sport engine or they simply won't carry any load at all.
Bench runs with the intended prop for flying will reveal a ballpark idea for what the engine needs for nitro. The best policy is to stay on the low side until you've gained a lot of experience with the engine in the air. Adding nitro is like adding air to a cutting torch in a piped racing engine.
Adding nitro to a mild sport engine, you can be alot more reckless.
Bench runs with the intended prop for flying will reveal a ballpark idea for what the engine needs for nitro. The best policy is to stay on the low side until you've gained a lot of experience with the engine in the air. Adding nitro is like adding air to a cutting torch in a piped racing engine.
Adding nitro to a mild sport engine, you can be alot more reckless.
10-14-2009, 12:46 PM
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RE: OPS .65 bench run.. finally!
I've yet to try another engine other than sport type but realise they are a thoroughbred and need to be coaxed gently before they show you what hp they can produce.
10-14-2009, 01:09 PM
#34
RE: OPS .65 bench run.. finally!
The insipid deal is that the prop load is the catalyst to fry them, nitro or no nitro. The thickness and weight of the blades between 2 identically marked XxX size props is critical. You can't go too light or thin to make the engine happy. The high exhaust timing makes these engines more like the little guy at the gym who can only bench a little weight off his chest real fast.
10-14-2009, 01:40 PM
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RE: OPS .65 bench run.. finally!
At this point I intend to run it in on the same brew all the time. I used to fly it's somewhat more sane stablemate, an OPS Super .60 - 3 port sleeve, FIRE, pattern timing - in a grossly overweight Cass Pulsar bipe (7.5-8lb?), on FAI and/or 5% fuel and no more and using a Zingali nylon prop. It pulled it around like a bear. So I don't foresee any need for more power than this thing is prepared to offer me right now. This on a 4lb 32" delta will be enough to cause involuntary bowel function as it is.
MJD
MJD
10-14-2009, 05:05 PM
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RE: OPS .65 bench run.. finally!
Yup. I plan on flying the 8.25x10 [still no homemade props but I have a master ready at least] so I am bench running the engine on the same prop but cut down to 85% of diameter. This is so that the engine on the ground can run at or close to the in-flight rpm on the ground in a slightly rich 2 cycle. I am now at about 11.5" pipe length and the prop is a hair under 7" diameter. Looking from the front, the propellor doesn't even look capable of slowing the engine below a shaft run, but I guess 10" pitch and the fact that the blades are moving m=.8 or so helps.
Pitch speed at 22k assuming it is really 10" pitch is 208. So far in the richest 2c I could dial in it is running 21,200-21,300, and I am sure it will peak to over 22 once I thin it out a bit on the ground. The SD has small enough frontal area and is clean enough with a cowl to be capable of cracking 200, I am pretty sure of that. So far so good.
MJD
Pitch speed at 22k assuming it is really 10" pitch is 208. So far in the richest 2c I could dial in it is running 21,200-21,300, and I am sure it will peak to over 22 once I thin it out a bit on the ground. The SD has small enough frontal area and is clean enough with a cowl to be capable of cracking 200, I am pretty sure of that. So far so good.
MJD
10-14-2009, 10:12 PM
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RE: OPS .65 bench run.. finally!
ORIGINAL: freakingfast
I sure hope you have a fast ''warm up plane'' to fly first before you attempt launching that THING
I sure hope you have a fast ''warm up plane'' to fly first before you attempt launching that THING
MJD
10-14-2009, 10:24 PM
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RE: OPS .65 bench run.. finally!
ORIGINAL: combatpigg
What does ILJ say the launch rpm with that size prop is?
With the .60s do they launch on the pipe, then richen the mixture before the first dive?
What does ILJ say the launch rpm with that size prop is?
With the .60s do they launch on the pipe, then richen the mixture before the first dive?
I will fit an RNV to the aircraft, I'm looking forward to being able to mess with mixture.
MJD
10-14-2009, 11:46 PM
#43
RE: OPS .65 bench run.. finally!
I got a couple props from Eliminator for the FAI engine. Pretty reasonable at $16 each, don't you think? They will need to be evaluated, hopefully through several flights before I'm ready to call one of them a master. Mr. Wilk really packs the CF in there! Mine came with the hubs trued and they are a perfect fit on the Nelson shaft. I'm in the dark about how fine a finish they need...for a belly landing delta around here.
If your engine is going to be turning a little less prop than what the "killer prop" is, that is a good place to start. The "killer prop" is just like the stack of weights that will either cripple the weightlifter or earn him the gold medal...completely different game than sport flying.
If your engine is going to be turning a little less prop than what the "killer prop" is, that is a good place to start. The "killer prop" is just like the stack of weights that will either cripple the weightlifter or earn him the gold medal...completely different game than sport flying.
10-15-2009, 07:04 AM
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RE: OPS .65 bench run.. finally!
Wow. Have you ever flown a plane at 200mph speed? The 50 size warm up plane will feel like a trainer!!
Would an inflight mixture device help?
I really hope you clock 200mph plus Mike, not long before maiden?
Would an inflight mixture device help?
I really hope you clock 200mph plus Mike, not long before maiden?
10-15-2009, 10:24 AM
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RE: OPS .65 bench run.. finally!
Fantastic thread, especially the Girly-OPS Metaphor.
Combatpigg: Let us know how the Eliminator props turn out. Also, if you have Mr. Wilk´s email address I would appreciate if you send it to me. The one I have keeps bouncing back.
Ed
Combatpigg: Let us know how the Eliminator props turn out. Also, if you have Mr. Wilk´s email address I would appreciate if you send it to me. The one I have keeps bouncing back.
Ed
10-15-2009, 10:40 AM
#46
RE: OPS .65 bench run.. finally!
Ed, this is what I got...not sure if it [email protected] 763 531 0604
He lives in Minnesota and is working nights at this time. He got the props to me within about 2 weeks, but the postmark was 8 days before the Postal Service delivered the package.
170-180 mph seems slow on these deltas, no reason why 200 should cause a panic.........
I will say that it will make a 1000 foot X 1000 foot field seem just big enough for safety sake.
He lives in Minnesota and is working nights at this time. He got the props to me within about 2 weeks, but the postmark was 8 days before the Postal Service delivered the package.
170-180 mph seems slow on these deltas, no reason why 200 should cause a panic.........
I will say that it will make a 1000 foot X 1000 foot field seem just big enough for safety sake.
10-15-2009, 10:56 AM
#48
RE: OPS .65 bench run.. finally!
I'm trying the "P2" prop which is 7.25"X7. I'm shortening to 7" even. The hope is to get over 30,000 in the air without overheating the engine. This should be at least a workable starting point to see how the speed compares with the lower timed engine that pulled the same plane to 178 mph.
10-15-2009, 12:23 PM
#49
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RE: OPS .65 bench run.. finally!
If your engine is going to be turning a little less prop than what the "killer prop" is, that is a good place to start. The "killer prop" is just like the stack of weights that will either cripple the weightlifter or earn him the gold medal...completely different game than sport flying
10-15-2009, 07:13 PM
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RE: OPS .65 bench run.. finally!
ORIGINAL: mk1spitfire
Wow. Have you ever flown a plane at 200mph speed? The 50 size warm up plane will feel like a trainer!!
Would an inflight mixture device help?
I really hope you clock 200mph plus Mike, not long before maiden?
Wow. Have you ever flown a plane at 200mph speed? The 50 size warm up plane will feel like a trainer!!
Would an inflight mixture device help?
I really hope you clock 200mph plus Mike, not long before maiden?
Timing: I hope winter doesn't get here before I am done! I do plan to fit a mixture control, for 30 bucks it seems sensible as opposed to $165 piston/liner sets, plus it is a way to fine tune the run.
MJD