Phil May Posted October 2, 2013 Share Posted October 2, 2013 Hi all. I've recently acquired a PMP Bae Hawk off eBay for the sum of £35. The model is in good nick and when I maidened it a few weeks ago it was obvious that it needed ballast to penertate the 20 mph wind. I borrowed 2 x 75g slugs and placed inside the fuz' on the c of g, this made a huge difference. When I got the model home I decided to add a similar amount semi-permanent as I only plan to fly this in a decent blow. When I flew on the weekend (different slope but similar wind speed ) the model would only stooge about. I borrowed some more slugs and taped the underneath on the c of g. This made no difference at all. I carried out a dive test with the added weights and it slightly wanted to climb out indicating slightly nose heavy.... Obviously I need to make a few adjustments but would this slight nose heavy give me this slow flight characteristics and unable to penertate? It is so different compared to the last time I flew it. Any advice greatly appreciated. Thanks all. Phil Edited By Big Phil on 02/10/2013 19:32:13 Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 2, 2013 Share Posted October 2, 2013 Well firstly, I would be careful about ballast - if you overdo it, even slightly, the Hawk WILL bite. I see it has no wing fences either As to its poor performance, being slightly nose heavy should not cause a drop in speed, other than possibly having a little "up" elevator whichg would increase drag slighly - perhaps this new to you slope just hasnt got quite the same lift you are used to. Quote Link to comment Share on other sites More sharing options...
Phil May Posted October 2, 2013 Author Share Posted October 2, 2013 Hi Tim Thanks for that, we've flown this slope quite often....it is a good local slope. but not as good as the Bwlch which is where I first flew the Hawk. My plan is to remove the 'semi permanent ' ballast and make a compartment in the fuz' where I can add or remove lead as required. I don't mean to sound thick but what are wing fences? Here's a link to a video which includes a little of the Hawk on it's 2nd flight at the Bwlch with the ballast. Quote Link to comment Share on other sites More sharing options...
Bearair Posted October 2, 2013 Share Posted October 2, 2013 Hi Phil, why not give Mr Yeo a ring at PMP I am sure he will be the best person to talk to and he is very helpful. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted October 3, 2013 Share Posted October 3, 2013 Wing Fences are small strips positioned at T/E towards L/E around 2/3rds span, they can help to reduce airflow "falling off" the wing spanwise, causing tip stalls. Picture above shows them quite well Edited By Tim Mackey on 03/10/2013 11:46:21 Quote Link to comment Share on other sites More sharing options...
Phil May Posted October 3, 2013 Author Share Posted October 3, 2013 Ah thanks Tim. That is a nice Hawk, mine is not a patch on that. As with most of Stans older models mine is foam on ply construction and only semi-scale.... sort of ish...IYKWIM. I spoke to Stan today and he describes my Hawk as a stable model that could be clased as an aileron trainer. He suggested that I double check the C of G and experiment with the weight that I add. Quote Link to comment Share on other sites More sharing options...
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